Problem: Delay construction of multipath device (/ dev/dm-3)
 

Problem: Delay construction of multipath device (/ dev/dm-3)

Hi,

I have a server and all works well at the beginning and I have no problem with multipath:
- Server SunX4100
- Sun Storage Sun Storage Teck 2540
- Redhat Enterprise 5.2 (2.6.18-128.1.16.el5)
- 1Seul fiber card (Dual Port) optical Qlogic (qla2xxx)
- 2 Qlogic Fiber Switch 5600

# multipath -v2 -ll
mpath2 (3600a0b80004946b80000083b4a4a0137) dm-3 SUN,LCSM100_F
[size=305G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=100][active]
\_ 3:0:0:1 sdf 8:80 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:1 sde 8:64 [active][ghost]
mpath1 (3600a0b8000493fb6000008674a4a0130) dm-2 SUN,LCSM100_F
[size=240G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=100][enabled]
\_ 4:0:0:0 sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:0:0 sdc 8:32 [active][ghost]

My fstab :
/dev/VolGroup00/LogVol00 / ext3 defaults 1 1
LABEL=/boot /boot ext3 defaults 1 2
tmpfs /dev/shm tmpfs defaults 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
sysfs /sys sysfs defaults 0 0
proc /proc proc defaults 0 0
/dev/dm-2 /home auto defaults 0 0
/dev/dm-3 /data auto defaults 0 0
/dev/VolGroup00/LogVol01 swap swap defaults 0 0

# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
64G 20G 42G 33% /
/dev/sda1 99M 24M 71M 25% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/dm-2 240G 148G 93G 62% /home
/dev/dm-3 305G 115G 191G 38% /data


Now,I have a problem with multipath:

After a time,in the boot I got the message that displays:
Mounting local filesystems: mount: special device / dev/dm-3 does not exist
/ sbin / mount.gfs gfs_controld not running error mounting lock proto lock_dlm

After starting the server I do:
# multipath -v2 -ll
mpath1 (3600a0b8000493fb6000008674a4a0130) dm-2 SUN,LCSM100_F
[size=240G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=100][active]
\_ 4:0:0:0 sdd 8:48 [active][ready]

And
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
64G 20G 42G 33% /
/dev/sda1 99M 24M 71M 25% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/dm-2 240G 148G 93G 62% /home

I tried to solve the problem

When I do:
# service multipathd restart
Then
# multipath -v2 -ll
mpath2 (3600a0b80004946b80000083b4a4a0137) dm-3 SUN,LCSM100_F
[size=305G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=100][active]
\_ 3:0:0:1 sdf 8:80 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 4:0:0:1 sde 8:64 [active][ghost]
mpath1 (3600a0b8000493fb6000008674a4a0130) dm-2 SUN,LCSM100_F
[size=240G][features=1 queue_if_no_path][hwhandler=1 rdac][rw]
\_ round-robin 0 [prio=100][enabled]
\_ 4:0:0:0 sdd 8:48 [active][ready]
\_ round-robin 0 [prio=0][enabled]
\_ 3:0:0:0 sdc 8:32 [active][ghost]

I have a good result and I do mount-a.
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
64G 20G 42G 33% /
/dev/sda1 99M 24M 71M 25% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm
/dev/dm-2 240G 148G 93G 62% /home
/dev/dm-3 305G 115G 191G 38% /data

All is good. but it's not automatic !!!

I made the upgrade to Redhat 5.4 (2.6.18-164.el5) but I have not solved the problem
How I can do.
Thanks