miércoles, 23 de agosto de 2017

Agregar repositorios optional y extras red hat satellite.

Esta es una entrada sencilla para agregar repositorios extra de nuestro satelite ya configurado a nuestro servidor.

Desde nuestro servidor p-01 vemos que repositorios tenemos configurados.

[root@p-01 ~]# yum repolist 
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
repo id                                                    repo name                                                          status
!rhel-7-server-optional-rpms/7Server/x86_64                Red Hat Enterprise Linux 7 Server - Optional (RPMs)                12,683
!rhel-7-server-rpms/7Server/x86_64                         Red Hat Enterprise Linux 7 Server (RPMs)                           16,956
repolist: 29,639

En este caso estan los rhel-7-server-rpms y rhel-7-server-optional-rpms

Verifico que repositorios tengo disponibles para habilitar
Me muestra el nombre la url y si esta o no habilitado.

[root@p-01 ~]# subscription-manager repos --list


+----------------------------------------------------------+
    Available Repositories in /etc/yum.repos.d/redhat.repo
+----------------------------------------------------------+
Repo ID:   rhel-7-server-satellite-tools-6.2-rpms
Repo Name: Red Hat Satellite Tools 6.2 (for RHEL 7 Server) (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/7Server/$basearch/sat-tools/6.2/os
Enabled:   0

Repo ID:   rhel-server-rhscl-7-rpms
Repo Name: Red Hat Software Collections RPMs for Red Hat Enterprise Linux 7 Server
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/rhscl/1/os
Enabled:   0

Repo ID:   rhel-7-server-optional-rpms
Repo Name: Red Hat Enterprise Linux 7 Server - Optional (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/optional/os
Enabled:   1

Repo ID:   rhel-7-server-openstack-10-tools-rpms
Repo Name: Red Hat OpenStack Platform 10 Tools for RHEL 7 Server (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/openstack-to
           ols/10/os
Enabled:   0

Repo ID:   rhel-7-server-rh-common-rpms
Repo Name: Red Hat Enterprise Linux 7 Server - RH Common (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/rh-common/os
Enabled:   0

Repo ID:   rhel-7-server-rhn-tools-rpms
Repo Name: RHN Tools for Red Hat Enterprise Linux 7 Server (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/rhn-tools/os
Enabled:   0

Repo ID:   rhel-7-server-v2vwin-1-rpms
Repo Name: Red Hat Virt V2V Tool for RHEL 7 (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/v2vwin/os
Enabled:   0

Repo ID:   rhel-7-server-rpms
Repo Name: Red Hat Enterprise Linux 7 Server (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/os
Enabled:   1

Repo ID:   rhel-7-server-supplementary-rpms
Repo Name: Red Hat Enterprise Linux 7 Server - Supplementary (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/$releasever/$basearch/supplementar
           y/os
Enabled:   0

Repo ID:   rhel-7-server-extras-rpms
Repo Name: Red Hat Enterprise Linux 7 Server - Extras (RPMs)
Repo URL:  https://sat.xxx/pulp/repos/xxx/Library/content/dist/rhel/server/7/7Server/$basearch/extras/os
Enabled:   0

Habilito el que me falta y reviso

[root@p-01 ~]# subscription-manager repos --enable rhel-7-server-extras-rpms



[root@p-01 ~]# yum repolist
Loaded plugins: langpacks, product-id, search-disabled-repos, subscription-manager
rhel-7-server-extras-rpms                                                                                    | 2.0 kB  00:00:00     
rhel-7-server-optional-rpms                                                                                  | 2.0 kB  00:00:00     
rhel-7-server-rpms                                                                                           | 2.0 kB  00:00:00     
(1/9): rhel-7-server-extras-rpms/x86_64/group                                                                |  130 B  00:00:00     
(2/9): rhel-7-server-extras-rpms/x86_64/updateinfo                                                           | 182 kB  00:00:00     
(3/9): rhel-7-server-extras-rpms/x86_64/primary                                                              | 154 kB  00:00:00     
(4/9): rhel-7-server-optional-rpms/7Server/x86_64/group                                                      |  19 kB  00:00:00     
(5/9): rhel-7-server-optional-rpms/7Server/x86_64/updateinfo                                                 | 1.6 MB  00:00:00     
(6/9): rhel-7-server-optional-rpms/7Server/x86_64/primary                                                    | 3.6 MB  00:00:00     
(7/9): rhel-7-server-rpms/7Server/x86_64/group                                                               | 595 kB  00:00:00     
(8/9): rhel-7-server-rpms/7Server/x86_64/updateinfo                                                          | 2.2 MB  00:00:00     
(9/9): rhel-7-server-rpms/7Server/x86_64/primary                                                             |  23 MB  00:00:00     
rhel-7-server-extras-rpms                                                                                                   603/603
rhel-7-server-optional-rpms                                                                                             12683/12683
rhel-7-server-rpms                                                                                                      16956/16956
repo id                                                    repo name                                                          status
!rhel-7-server-extras-rpms/x86_64                          Red Hat Enterprise Linux 7 Server - Extras (RPMs)                     603
!rhel-7-server-optional-rpms/7Server/x86_64                Red Hat Enterprise Linux 7 Server - Optional (RPMs)                12,683
!rhel-7-server-rpms/7Server/x86_64                         Red Hat Enterprise Linux 7 Server (RPMs)                           16,956
repolist: 30,242

viernes, 11 de agosto de 2017

Conectarse por consola a un redhat linux instalado en un Dell PowerEdge R910 por ssh:

Nos encontramos con el equipo encendido y funcionando ok y queremos dejar configurada la consola para acceder al management por ssh y de ahi conectarnos por serial al linux.

Se modifico el archivo /etc/inittab en el linux se agrego la siguiente linea (despues de probar varias velocidades)
co:2345:respawn:/sbin/agetty -h -L 115200 ttyS1

Se agrego la linea ttyS1 al final del archivo
/etc/securetty

Se le dio kill -1 al init.


Ahora nos conectamos al idrac (la ilom de dell) por ssh
ssh root@10.XX.XX.XX
password: calvin  (es la default)

/admin1-> console com2

Connected to Serial Device 2. To end type: ^\
plnxxx.redhat4ever.com.ar login:




Si queremos ver la consola desde el grupo o sea ver como bootea el equipo debemos tambien configurar unas lineas del /etc/grub.conf

agregamos
serial --unit=1 --speed=115200
terminal --timeout=10 serial
comentamos
#splashimage=(hd0,2)/grub/splash.xpm.gz
#hiddenmenu

y modificamos la linea del kernel
 kernel .......... console=ttyS1,115200n8r console=tty1

martes, 1 de agosto de 2017

Asignacion de LUNS IBM-2145

Este articulo pretende ser un paso a paso para asignar luns de un IBM-2145 a un Red Hat Enterprise Linux Server release 6.7.
El articulo como siempre esta basado en los recetas, instrucciones y consejos de mis colegas, Adrian, Gonzalo, Norman y Javier. 

Partimos de un server con Red Hat 6 recien instalado y se nos asignaron 9 luns de 1Tb.

El paso a paso consta de 4 partes generales:


-------------------------------------------------------------------------------------------------------------------------
# Configuracion de Multipath.


Creamos el archivo de configuracion y rescaneamos

[root@plweb1 ~]# cp /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf /etc/multipath.conf

[root@plweb1 ~]# /etc/init.d/multipathd restart

[root@plweb1 ~]# multipath -F ; multipath -v3 ; multipath -ll

[root@plweb1 ~]# mpathconf --enable --with_multipathd y 
Me guardo la salida de multipath en un archivo para tener la configuracion vieja.

[root@plweb1 ~]# multipath -ll > multipath.ll

Nos guardamos los discos.

[root@plweb1 ~]# multipath -l | grep dm-
mpathb (3600507680c8081eee000000000000006) dm-6 IBM,2145
mpathc (3600507680c8081eee000000000000008) dm-7 IBM,2145
mpathd (3600507680c8081eee00000000000000a) dm-8 IBM,2145
mpathe (3600507680c8081eee00000000000000c) dm-9 IBM,2145
mpathf (3600507680c8081eee00000000000000e) dm-10 IBM,2145
mpathg (3600507680c8081eee000000000000007) dm-11 IBM,2145
mpathh (3600507680c8081eee000000000000009) dm-12 IBM,2145
mpathi (3600507680c8081eee00000000000000b) dm-13 IBM,2145
mpathj (3600507680c8081eee00000000000000d) dm-14 IBM,2145

Modifico el archivo para que me quede asi, el archivo cambia casi entero, resalto lo que se le agrega.

[root@plweb1 ~]#  cat /etc/multipath.conf
###############################################################################
# Multipath.conf file for IBM Storage
#
# Version 3.01
#
# IMPORTANT: If you change multipath.conf settings after the DM MPIO devices
# have already been configured, be sure to rerun "multipath".
###############################################################################
#
#
# defaults:
#
#     polling_interval   : The interval between two path checks in seconds.
#
#     failback           : The failback policy should be set to "immediate"
#                          to have automatic failback, i.e. if a higher
#                          priority path that previously failed is restored,
#                          I/O automatically and immediately fails back to
#                          the preferred path.
#
#    no_path_retry       : Use this setting in order to deal with transient
#                          total path failure scenarios. Indicates that the if
#                          all paths are failed for 10 checks (iterations of
#                          the checkerloop) then will set the device to
#                          .fail_if_no_path. so that I/O will not stay queued
#                          forever and I/O errors are returned back to the
#                          application. This value should be adjusted based on
#                          the value of the polling_interval. Basically, with a
#                          larger polling_interval, this means that the amount
#                          of time of allowed total path failure will be
#                          longer, since the tolerance time is
#                          (no_path_retry * polling_interval) seconds.
#                          SHOULD NOT BE USED WITH .features..
#
#    rr_min_io           : The number of IOs to route to a path before switching
#                          to the next path in the same path group
#
#    path_checker        : The default 'readsector0' path checker uses SCSI
#                          READ (opcode 0x28) which doesn't work in clustered
#                          environments. TUR (Test Unit Ready) does work in
#                          clustered environments with storage that subscribes
#                          to the SCSI-3 spec.
#
#    user_friendly_names : With this value set to .yes., DM MPIO devices will
#                          be named as .mpath0., .mpath1., .mpath2., etc. ...
#                          The /var/lib/mulitpath/bindings file is
#                          automatically generated, mapping the .mpathX. name
#                          to the wwid of the LUN. If set to "no", use the
#                          WWID as the alias. In either case this be will be
#                          overriden by any specific aliases in this file.
#
#
defaults {
    polling_interval    30
    failback            immediate
    no_path_retry       5
    rr_min_io           100
    path_checker        tur
    user_friendly_names yes
}

#

# An example of blacklisting a local SCSI disk.
# Here a local disk with wwid SIBM-ESXSMAN3184MC_FUFR9P29044K2 is
# blacklisted and will not appear when "multipath -l(l)" is invoked.
#
#
#blacklist {
#    wwid SIBM-ESXSMAN3184MC_FUFR9P29044K2
#}

#

# An example of using an alias.
# NOTE: this will override the "user_friendly_name" for this LUN.
#
# Here a LUN from IBM storage with wwid 3600507630efffe32000000000000120a
# is given an alias of "IBM-1750" and will appear as "IBM-1750
#(3600507630efffe32000000000000120a)", when "multipath -l(l)" is invoked.
#
#
#multipaths {
#    multipath {
#        wwid 3600507630efffe32000000000000120a
#        alias IBM-1750
#    }
#}

#

#  devices    : List of per storage controler settings, overrides default
#              settings (device_maps block), overriden by per multipath
#              settings (multipaths block)
#
#  vendor     : Vendor Name
#
#  product    : Product Name
#
#  path_grouping_policy : Path grouping policy to apply to multipath hosted
#                         by this storage controller
#
#  prio_callout : The program and args to callout to obtain a path
#              weight. Weights are summed for each path group to
#              determine the next PG to use case of failure.
#              NOTE: If no callout then all paths have equals weight.
#
#
devices {
# These are the default settings for 2145 (IBM SAN Volume Controller)
# Starting with RHEL5, multipath includes these settings be default
    device {
        vendor                   "IBM"
        product                  "2145"
        prio                     "alua"
        path_grouping_policy     group_by_prio
        #prio_callout             "/sbin/mpath_prio_alua /dev/%n"
    }

# These are the default settings for 1750 (IBM DS6000)

# Starting with RHEL5, multipath includes these settings be default
    device {
        vendor                   "IBM"
        product                  "1750500"
        prio                     "alua"
        path_grouping_policy     group_by_prio
        #prio_callout             "/sbin/mpath_prio_alua /dev/%n"
    }

# These are the default settings for 2107 (IBM DS8000)

# Uncomment them if needed on this system
    device {
        vendor                   "IBM"
        product                  "2107900"
        path_grouping_policy     group_by_serial
    }

# These are the default settings for 2105 (IBM ESS Model 800)

# Starting with RHEL5, multipath includes these settings be default
    device {
        vendor                   "IBM"
        product                  "2105800"
        path_grouping_policy     group_by_serial
    }
}
multipaths {
        multipath {
               wwid                    3600507680c8081eee000000000000006
               alias                   mp_01
        }
        multipath {
               wwid                    3600507680c8081eee000000000000008
               alias                   mp_02
        }
        multipath {
               wwid                    3600507680c8081eee00000000000000a
               alias                   mp_03
        }
        multipath {
               wwid                    3600507680c8081eee00000000000000c
               alias                   mp_04
        }
        multipath {
               wwid                    3600507680c8081eee00000000000000e
               alias                   mp_05
        }
        multipath {
               wwid                    3600507680c8081eee000000000000007
               alias                   mp_06
        }
        multipath {
               wwid                    3600507680c8081eee000000000000009
               alias                   mp_07
        }
        multipath {
               wwid                    3600507680c8081eee00000000000000b
               alias                   mp_08
        }
        multipath {
               wwid                    3600507680c8081eee00000000000000d
               alias                   mp_09
        }

}


for f in  $(ls /sys/class/fc_host); do  echo "1" > /sys/class/fc_host/$f/issue_lip; done

for s in  $(ls /sys/class/scsi_host); do echo "- - -" > /sys/class/scsi_host/$s/scan; done
multipath -F ; multipath -v3 ; multipath -ll

# Alinemiento de discos. Particionado.
Segun recomendacion de emc se deben alinear los discos despues del sector 128.

Una manera con fdsik para entender el proceso entero:

[root@plweb1 ~]# fdisk /dev/mapper/mp_09
...
Command action
   e   extended
   p   primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-133674, default 1):_
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-133674, default 133674):_
Using default value 133674

Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)

Command (m for help): x

Expert command (m for help): b
Partition number (1-4): 1
New beginning of data (1-2147472809, default 63): 128

Expert command (m for help): p

Disk /dev/mapper/mp_09: 255 heads, 63 sectors, 133674 cylinders


Nr AF  Hd Sec  Cyl  Hd Sec  Cyl     Start      Size ID

 1 00   1   1    0 254  63 1023        128 2147472682 8e
 2 00   0   0    0   0   0    0          0          0 00
 3 00   0   0    0   0   0    0          0          0 00
 4 00   0   0    0   0   0    0          0          0 00

Expert command (m for help): w
The partition table has been altered!

Con fdisk -lu chequeo que el sector inicial quede en 128.

[root@plweb1 ~]# fdisk -lu /dev/mapper/mp_09

Disk /dev/mapper/mp_09: 1099.5 GB, 1099511627776 bytes

255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 32768 bytes / 32768 bytes
Disk identifier: 0x4c118c65

                      Device Boot      Start         End      Blocks   Id  System

/dev/mapper/mp_09p1             128  2147472809  1073736341   8e  Linux LVM

Ahora puedo o bien crear esta misma particion en cada uno de los discos a asignar o en este caso como se que todos los discos (luns) tienen la misma geometria y tamaño copiar la tabla de particiones de un disco a otro. (solo muestro uno de los 8 sfdisk que hago)

[root@plweb1 ~]# sfdisk -d /dev/mapper/mp_09 | sfdisk  /dev/mapper/mp_08

Chequeo que haya quedado ok. (muestro solo uno pero verifico en los 9 discos)

[root@plweb1 ~]# fdisk -lu /dev/mapper/mp_08

Disk /dev/mapper/mp_08: 1099.5 GB, 1099511627776 bytes

255 heads, 63 sectors/track, 133674 cylinders, total 2147483648 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 32768 bytes / 32768 bytes
Disk identifier: 0x00000000

                      Device Boot      Start         End      Blocks   Id  System

/dev/mapper/mp_08p1             128  2147472809  1073736341   8e  Linux LVM

# Creacion de Volume Groups y Logical Volumes con lvm.
Finalizado el particionado corro el comando partprobe para releer las particiones.

[root@plweb1 ~]# partprobe
Warning: WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy).  As a result, it may not reflect all of your changes until after reboot.

Inicializo con Pvcreate

[root@plweb1 ~]# pvcreate /dev/mapper/mp_01p1 /dev/mapper/mp_02p1 /dev/mapper/mp_03p1 /dev/mapper/mp_04p1 /dev/mapper/mp_05p1 /dev/mapper/mp_06p1 /dev/mapper/mp_07p1 /dev/mapper/mp_08p1 /dev/mapper/mp_09p1
  Physical volume "/dev/mapper/mp_01p1" successfully created
  Physical volume "/dev/mapper/mp_02p1" successfully created
  Physical volume "/dev/mapper/mp_03p1" successfully created
  Physical volume "/dev/mapper/mp_04p1" successfully created
  Physical volume "/dev/mapper/mp_05p1" successfully created
  Physical volume "/dev/mapper/mp_06p1" successfully created
  Physical volume "/dev/mapper/mp_07p1" successfully created
  Physical volume "/dev/mapper/mp_08p1" successfully created
  Physical volume "/dev/mapper/mp_09p1" successfully created

Creo el vg

[root@plweb1 ~]# vgcreate vg_ /dev/mapper/mp_01p1 /dev/mapper/mp_02p1 /dev/mapper/mp_03p1 \
> /dev/mapper/mp_04p1 /dev/mapper/mp_05p1 /dev/mapper/mp_06p1 \
> /dev/mapper/mp_07p1 /dev/mapper/mp_08p1 /dev/mapper/mp_09p1
  Volume group "vg_" successfully created

Creo los lv
[root@plweb1 ~]# lvcreate -n lv_opt_ar -L 7tb vg_
  Logical volume "lv_opt_ar" created.
[root@plweb1 ~]# lvcreate -n lv_opt_ar_archives -L 2tb vg_
  Volume group "vg_" has insufficient free space (524270 extents): 524288 required.

nunca anda porque los extents nunca son exactos asi que le pongo el 100% de lo que queda.
[root@plweb1 ~]# lvcreate -n lv_opt_ar_archives -l 100%FREE vg_

# Creacion de fs y montaje.
Creo y modifico los flags para que no haga fsck automaticamente con tune2fs.

[root@plweb1 ~]# mkfs.ext4 /dev/mapper/vg_-lv_opt_ar
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=8 blocks, Stripe width=0 blocks
469762048 inodes, 1879048192 blocks
93952409 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
57344 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000, 550731776, 644972544

Writing inode tables: done                          

Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 23 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@plweb1 ~]# tune2fs -c -1 /dev/vg_/lv_opt_ar
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to -1
[root@plweb1 ~]# tune2fs -i -1 /dev/vg_/lv_opt_ar
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 18446744073709465216 seconds
[root@plweb1 ~]#

[root@plweb1 ~]# mkfs.ext4 /dev/mapper/vg_-lv_opt_ar_archives

mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=8 blocks, Stripe width=0 blocks
134217728 inodes, 536852480 blocks
26842624 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=4294967296
16384 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
        32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
        4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
        102400000, 214990848, 512000000

Writing inode tables: done                          

Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 25 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.
[root@plweb1 ~]# tune2fs -c -1 /dev/vg_/lv_opt_ar_archives  
tune2fs 1.41.12 (17-May-2010)
Setting maximal mount count to -1
[root@plweb1 ~]# tune2fs -i -1 /dev/vg_/lv_opt_ar_archives
tune2fs 1.41.12 (17-May-2010)
Setting interval between checks to 18446744073709465216 seconds


Monto y agrego al /etc/fstab
[root@plweb1 ~]# mkdir /opt/ar
[root@plweb1 ~]# mount /dev/vg_/lv_opt_ar /opt/ar
[root@plweb1 ~]# mkdir /opt/ar/archives
[root@plweb1 ~]# mount /dev/vg_/lv_opt_ar_archives /opt/ar/archives

Agrego las siguientes lineas al /etc/fstab
/dev/mapper/vg_-lv_opt_ar                 /opt/ar   ext4    defaults        1 2
/dev/mapper/vg_-lv_opt_ar_archives        /opt/ar/archives  ext4    defaults        1 2



lunes, 17 de julio de 2017

Luns con multipath


El equipo es un redhat 5.4
Con discos presentados por fibra a traves de un solo paso.

Se observaba en falla asi:

[root@uat1 ~]# multipath -ll
...
u01 (360060e80100ac700053024780000015c) dm-4 HITACHI,DF600F
[size=32G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 4:0:0:1  sdb        8:16  [active][ready] 
raw_data (360060e80100ac7000530247800000050) dm-16 HITACHI,DF600F
[size=240G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=1][active]
 \_ 4:0:0:13 sdn        8:208 [active][ready] 
u00 (360060e80100ac700053024780000015b) dm-3 HITACHI,DF600F
[size=32G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][active]
 \_ 4:0:0:0  sda        8:0   [active][ready] 
data_b (360060e80100ac7000530247800000158) dm-15 HITACHI,DF600F
[size=50G][features=0][hwhandler=0][rw]
\_ round-robin 0 [prio=0][enabled]
 \_ 4:0:0:12 sdm        8:192 [failed][faulty]

probamos con el comando rescan_scsi_bus.sh sin buenos resultados. El mismo viene en el paquete sg3_utils se instala asi:
yum install sg3_utils

rescan_scsi_bus.sh 

la solucion luego de chequear con el grupo encargado de la caja de discos que los discos estuvieran ok fue:


for s in  $(ls /sys/class/scsi_host); do 
FILE="/sys/class/fc_host/$s/issue_lip"; 
if [ -f $FILE ]; then
      echo $s "lip";       echo "1" > /sys/class/fc_host/$s/issue_lip; 
fi; 
FILE="/sys/class/scsi_host/$s/scan"; 
if [ -f $FILE ]; then
      echo $s "scan";      
  echo "- - -" > /sys/class/scsi_host/$s/scan; 
fi; 
sleep 3; 
done
multipath -F ; multipath -v3
multipath -ll | less 

con esto forzamos la reconfiguracion.

Una vez hecho esto y verificado en la salida de multipath que no haya failed se montaron los fs afectados nuevamente.

[root@uat2 ~]# mount /u00
mount: special device /dev/vg_u00/lv_u00 does not exist
[root@uat2 ~]# mount /u01
mount: special device /dev/vg_u01/lv_u01 does not exist


[root@uat2 ~]# lvscan
  inactive          '/dev/vg_u00/lv_u00' [32.00 GB] inherit
  inactive          '/dev/vg_u01/lv_u01' [32.00 GB] inherit

[root@uat2 ~]# vgchange -a y vg_u00
  1 logical volume(s) in volume group "vg_u00" now active
[root@uat2 ~]# vgchange -a y vg_u01
  1 logical volume(s) in volume group "vg_u01" now active
[root@uat2 ~]# mount /u00 
[root@uat2 ~]# mount /u01

[root@uat2 ~]# df -h 
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-lv_root
                       30G  4.4G   24G  16% /
/dev/mapper/VolGroup00-lv_home
                      9.7G  166M  9.1G   2% /home
/dev/cciss/c0d0p1      99M   27M   68M  29% /boot
tmpfs                 127G     0  127G   0% /dev/shm
/dev/mapper/vg_u00-lv_u00
                       32G  5.7G   25G  19% /u00
/dev/mapper/vg_u01-lv_u01
                       32G   26G  4.5G  86% /u01




El blog entero estara dedicado a mi compañero, instructor y amigo Diego Aguirre y es una copia adaptacion de su blog solaris4ever.blogspot.com al mundo linux.