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Hardware 2 poweredge 2850, dual xeon, 2Gb Ram, 2x36Gb scsi Raid 1 1 EMC CX 300, about 500Gb Raid 5 each poweredge is connected to EMC by two fibre channel paths Software Gentoo Linux, installed on poweredge internal disks kernel-2.6.13-gentoo-r1 udev-0.68-r1 device-mapper-1.01.03 multipath-tools-0.4.5 I setup a pure udev enviroment:
/etc/conf.d/rc:
RC_DEVICES="udev"
RC_DEVICE_TARBALL="no"
I load the following modules at boot time
dm-emc
qla2300
my mutipath-tools configuration file is the following:
grep -v "#" /etc/multipath.conf
defaults {
multipath_tool "/sbin/multipath -v0"
udev_dir /dev
polling_interval 5
default_selector "round-robin 0"
default_getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
default_prio_callout "/bin/true"
failback immediate
}
multipaths {
multipath {
wwid 3600601608c901200ccfe543f4053d911
alias 200Gb
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback immediate
}
multipath {
wwid 3600601608c9012006269b8f63b87d911
alias 5Gb
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback immediate
}
multipath {
wwid 3600601608c9012008ae5de2cc985d911
alias 300Gb
path_grouping_policy failover
path_checker readsector0
path_selector "round-robin 0"
failback immediate
}
}
multipathd start at boot time
rc-update add multipathd default
this is what system see after boot
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:4 sdf 8:80 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:4 sdk 8:160 [active][ready]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdd 8:48 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:2 sdi 8:128 [active][ready]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:1 sdc 8:32 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:1 sdh 8:112 [active][ready]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:0 sdb 8:16 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:0 sdg 8:96 [active][ready]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:3 sdj 8:144 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:3 sde 8:64 [active][ready]
dmsetup table
vg00-portage: 0 4096000 linear 8:4 16384384
vg00-tmp: 0 4096000 linear 8:4 4096384
vg00-log: 0 8192000 linear 8:4 26624384
vg00-usr: 0 8192000 linear 8:4 8192384
vg00-var: 0 6144000 linear 8:4 20480384
vg00-root: 0 2048000 linear 8:4 2048384
5Gb: 0 10485760 multipath 0 1 emc 2 1 round-robin 0 1 1 8:80 1000 round-robin 0 1 1 8:160 1000
3600601608c901200a8b8972f4053d911: 0 204800 multipath 0 1 emc 2 1 round-robin 0 1 1 8:48 1000 round-robin 0 1 1 8:128 1000
vg00-admin: 0 2048000 linear 8:4 384
200Gb: 0 419430400 multipath 0 1 emc 2 2 round-robin 0 1 1 8:32 1000 round-robin 0 1 1 8:112 1000
300Gb: 0 629145600 multipath 0 1 emc 2 1 round-robin 0 1 1 8:16 1000 round-robin 0 1 1 8:96 1000
3600601608c901200bc7680294053d911: 0 204800 multipath 0 1 emc 2 1 round-robin 0 1 1 8:144 1000 round-robin 0 1 1 8:64 1000
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 965M 534M 432M 56% /
udev 1014M 144K 1014M 1% /dev
/dev/sda1 54M 5.2M 46M 11% /boot
/dev/mapper/vg00-admin
1000M 33M 968M 4% /admin
/dev/mapper/vg00-root
1000M 33M 968M 4% /root
/dev/mapper/vg00-usr 4.0G 868M 3.1G 22% /usr
/dev/mapper/vg00-var 3.0G 74M 2.9G 3% /var
/dev/mapper/vg00-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg00-log 4.0G 40M 3.9G 1% /var/log
/dev/mapper/vg00-portage
2.0G 234M 1.8G 12% /usr/portage
none 1014M 0 1014M 0% /dev/shm
/dev/dm-2 5.0G 33M 5.0G 1% /mnt/web
/dev/dm-1 200G 33M 200G 1% /mnt/mysql
/dev/dm-4 300G 71M 300G 1% /mnt/mail
I have the following in /dev:
nodob admin # cd /dev/
nodob dev # ls -la
total 1
drwxr-xr-x 12 root root 3440 Sep 14 19:21 .
drwxr-xr-x 21 root root 624 Sep 14 19:21 ..
-rw-r--r-- 1 root root 0 Sep 14 2005 .udev
drwxr-xr-x 2 root root 760 Sep 14 2005 .udevdb
lrwxrwxrwx 1 root root 4 Sep 14 2005 200Gb -> dm-4
lrwxrwxrwx 1 root root 4 Sep 14 2005 300Gb -> dm-3
lrwxrwxrwx 1 root root 4 Sep 14 2005 3600601608c901200a8b8972f4053d911 -> dm-2
lrwxrwxrwx 1 root root 4 Sep 14 2005 3600601608c901200bc7680294053d911 -> dm-0
lrwxrwxrwx 1 root root 4 Sep 14 2005 5Gb -> dm-1
and in /dev/mapper:
nodob mapper # ls -la
total 0
drwxr-xr-x 2 root root 300 Sep 14 2005 .
drwxr-xr-x 12 root root 3440 Sep 14 19:29 ..
brw------- 1 root root 254, 1 Sep 14 2005 200Gb
brw------- 1 root root 254, 4 Sep 14 2005 300Gb
brw------- 1 root root 254, 3 Sep 14 2005 3600601608c901200a8b8972f4053d911
brw------- 1 root root 254, 0 Sep 14 2005 3600601608c901200bc7680294053d911
brw------- 1 root root 254, 2 Sep 14 2005 5Gb
crw-rw---- 1 root root 10, 63 Sep 14 2005 control
brw------- 1 root root 254, 5 Sep 14 2005 vg00-admin
brw------- 1 root root 254, 11 Sep 14 2005 vg00-log
brw------- 1 root root 254, 9 Sep 14 2005 vg00-portage
brw------- 1 root root 254, 6 Sep 14 2005 vg00-root
brw------- 1 root root 254, 7 Sep 14 2005 vg00-tmp
brw------- 1 root root 254, 8 Sep 14 2005 vg00-usr
brw------- 1 root root 254, 10 Sep 14 2005 vg00-var
some tests:
1) one path failure
/var/log/messages
Sep 14 19:33:21 nodob multipathd: 8:96: emc_clariion_checker: query command indicates error
Sep 14 19:33:21 nodob multipathd: checker failed path 8:96 in map 300Gb
Sep 14 19:33:21 nodob multipathd: 8:112: emc_clariion_checker: query command indicates error
Sep 14 19:33:21 nodob multipathd: checker failed path 8:112 in map 200Gb
Sep 14 19:33:21 nodob multipathd: 8:128: emc_clariion_checker: query command indicates error
Sep 14 19:33:21 nodob multipathd: checker failed path 8:128 in map 3600601608c901200a8b8972f4053d911
Sep 14 19:33:21 nodob multipathd: 8:144: emc_clariion_checker: query command indicates error
Sep 14 19:33:21 nodob multipathd: checker failed path 8:144 in map 3600601608c901200bc7680294053d911
Sep 14 19:33:21 nodob multipathd: 8:160: emc_clariion_checker: query command indicates error
Sep 14 19:33:21 nodob multipathd: checker failed path 8:160 in map 5Gb
Sep 14 19:33:21 nodob multipathd: remove sdg path checker
Sep 14 19:33:21 nodob multipathd: remove sdh path checker
Sep 14 19:33:21 nodob multipathd: remove sdi path checker
Sep 14 19:33:21 nodob multipathd: remove sdj path checker
Sep 14 19:33:21 nodob multipathd: remove sdk path checker
Sep 14 19:33:22 nodob multipathd: 8:160: mark as failed
Sep 14 19:33:43 nodob multipathd: 300Gb: switch to path group #1
Sep 14 19:33:43 nodob multipathd: 3600601608c901200a8b8972f4053d911: switch to path group #1
Sep 14 19:33:43 nodob multipathd: 3600601608c901200bc7680294053d911: switch to path group #1
Sep 14 19:33:43 nodob multipathd: 5Gb: switch to path group #1
Sep 14 19:33:43 nodob multipathd: 8:96: mark as failed
Sep 14 19:33:43 nodob multipathd: 8:128: mark as failed
Sep 14 19:33:43 nodob multipathd: 8:144: mark as failed
Sep 14 19:33:43 nodob multipathd: 8:160: mark as failed
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:4 sdf 8:80 [active][ready]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:160 [failed]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdd 8:48 [active][ready]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:128 [failed]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:1 sdc 8:32 [active][ready]
\_ round-robin 0 [active]
\_ #:#:#:# 8:112 [failed]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:0 sdb 8:16 [active][ready]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:96 [failed]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:144 [failed]
\_ round-robin 0 [enabled]
\_ 1:0:0:3 sde 8:64 [active][ready]
I can write to the storage without problem
2) the failed path turn up
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 1:0:0:4 sdf 8:80 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:4 sdp 8:240 [active][ready]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdd 8:48 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:2 sdn 8:208 [active][ready]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:1 sdc 8:32 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:1 sdm 8:192 [active][ready]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:0 sdb 8:16 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:0 sdl 8:176 [active][ready]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:3 sdo 8:224 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:3 sde 8:64 [active][ready]
I read and write without problem
every few seconds I have the following messages in /var/log/messages
Sep 14 19:36:58 nodob multipathd: 300Gb: switch to path group #1
Sep 14 19:36:58 nodob multipathd: 200Gb: switch to path group #2
Sep 14 19:36:58 nodob multipathd: 3600601608c901200a8b8972f4053d911: switch to path group #1
Sep 14 19:36:58 nodob multipathd: 3600601608c901200bc7680294053d911: switch to path group #1
Sep 14 19:36:58 nodob multipathd: 5Gb: switch to path group #1
Cristophe is ok?
3) other path failure
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:80 [failed]
\_ round-robin 0 [active]
\_ 2:0:0:4 sdp 8:240 [active][ready]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:48 [failed]
\_ round-robin 0 [enabled]
\_ 2:0:0:2 sdn 8:208 [active][ready]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:32 [failed]
\_ round-robin 0 [enabled]
\_ 2:0:0:1 sdm 8:192 [active][ready]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:16 [failed]
\_ round-robin 0 [enabled]
\_ 2:0:0:0 sdl 8:176 [active][ready]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:3 sdo 8:224 [active][ready]
\_ round-robin 0 [enabled]
\_ #:#:#:# 8:64 [failed]
dmsetup table
vg00-portage: 0 4096000 linear 8:4 16384384
vg00-tmp: 0 4096000 linear 8:4 4096384
vg00-log: 0 8192000 linear 8:4 26624384
vg00-usr: 0 8192000 linear 8:4 8192384
vg00-var: 0 6144000 linear 8:4 20480384
vg00-root: 0 2048000 linear 8:4 2048384
5Gb: 0 10485760 multipath 0 1 emc 2 2 round-robin 0 1 1 8:80 1000 round-robin 0 1 1 8:240 1000
3600601608c901200a8b8972f4053d911: 0 204800 multipath 0 1 emc 2 1 round-robin 0 1 1 8:48 1000 round-robin 0 1 1 8:208 1000
vg00-admin: 0 2048000 linear 8:4 384
200Gb: 0 419430400 multipath 0 1 emc 2 2 round-robin 0 1 1 8:32 1000 round-robin 0 1 1 8:192 1000
300Gb: 0 629145600 multipath 0 1 emc 2 1 round-robin 0 1 1 8:16 1000 round-robin 0 1 1 8:176 1000
3600601608c901200bc7680294053d911: 0 204800 multipath 0 1 emc 2 1 round-robin 0 1 1 8:224 1000 round-robin 0 1 1 8:64 1000
4) reboot with one path failed:
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 2:0:0:4 sdf 8:80 [active][ready]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 2:0:0:2 sdd 8:48 [active][ready]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 2:0:0:1 sdc 8:32 [active][ready]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 2:0:0:0 sdb 8:16 [active][ready]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [active]
\_ 2:0:0:3 sde 8:64 [active][ready]
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 965M 534M 432M 56% /
udev 1014M 124K 1014M 1% /dev
/dev/sda1 54M 5.2M 46M 11% /boot
/dev/mapper/vg00-admin
1000M 33M 968M 4% /admin
/dev/mapper/vg00-root
1000M 33M 968M 4% /root
/dev/mapper/vg00-usr 4.0G 868M 3.1G 22% /usr
/dev/mapper/vg00-var 3.0G 74M 2.9G 3% /var
/dev/mapper/vg00-tmp 2.0G 33M 2.0G 2% /tmp
/dev/mapper/vg00-log 4.0G 40M 3.9G 1% /var/log
/dev/mapper/vg00-portage
2.0G 234M 1.8G 12% /usr/portage
none 1014M 0 1014M 0% /dev/shm
/dev/dm-6 5.0G 476M 4.6G 10% /mnt/web
/dev/dm-10 200G 33M 200G 1% /mnt/mysql
/dev/dm-3 300G 71M 300G 1% /mnt/mail
NOTE: the dm device name (dm-*) change every reboot the symbolic name (web,mysql,mail) remane the same
dmsetup table
vg00-portage: 0 4096000 linear 8:4 16384384
vg00-tmp: 0 4096000 linear 8:4 4096384
vg00-log: 0 8192000 linear 8:4 26624384
vg00-usr: 0 8192000 linear 8:4 8192384
vg00-var: 0 6144000 linear 8:4 20480384
vg00-root: 0 2048000 linear 8:4 2048384
5Gb: 0 10485760 multipath 0 1 emc 1 1 round-robin 0 1 1 8:80 1000
3600601608c901200a8b8972f4053d911: 0 204800 multipath 0 1 emc 1 1 round-robin 0 1 1 8:48 1000
vg00-admin: 0 2048000 linear 8:4 384
200Gb: 0 419430400 multipath 0 1 emc 1 1 round-robin 0 1 1 8:32 1000
300Gb: 0 629145600 multipath 0 1 emc 1 1 round-robin 0 1 1 8:16 1000
3600601608c901200bc7680294053d911: 0 204800 multipath 0 1 emc 1 1 round-robin 0 1 1 8:64 1000
5) the failed path return up
multipath -l
5Gb (3600601608c9012006269b8f63b87d911)
[size=5 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:4 sdf 8:80 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:4 sdk 8:160 [active][ready]
3600601608c901200a8b8972f4053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 1:0:0:2 sdi 8:128 [active][ready]
\_ round-robin 0 [enabled]
\_ 2:0:0:2 sdd 8:48 [active][ready]
200Gb (3600601608c901200ccfe543f4053d911)
[size=200 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:1 sdc 8:32 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:1 sdh 8:112 [active][ready]
300Gb (3600601608c9012008ae5de2cc985d911)
[size=300 GB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:0 sdb 8:16 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:0 sdg 8:96 [active][ready]
3600601608c901200bc7680294053d911
[size=100 MB][features="0"][hwhandler="1 emc"]
\_ round-robin 0 [enabled]
\_ 2:0:0:3 sde 8:64 [active][ready]
\_ round-robin 0 [enabled]
\_ 1:0:0:3 sdj 8:144 [active][ready]
6) If I set multibus instead of failover in multipath.conf I have read-only filesystem after a path failure
Conclusion
For me multipath-tools on EMC CX300 works fine, there are only issue if i try multibus instead of failover, but I don't need multibus
thanks for multipath-tools,
Nicola
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