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MSA1000 in a RHEL 5.1 multipath environment

 
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Ralf Buchhold
Regular Advisor

MSA1000 in a RHEL 5.1 multipath environment

Hello

i have 6 bl460 in two c7000 encl.
With 2 SAN Switches an 2 MSA1000 Storage Systems.
I configure Multipathio with only with the RHEL5.1 software. No HP software is used.
my /etc/multipath.conf (some lines):
blacklist {
devnode "*"
}

blacklist_exceptions {
devnode "^(sd|dm-)*"
}

#blacklist {
# devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
#devnode "^hd[a-z]"
#}

defaults {
user_friendly_names yes
}

multipaths {
multipath {
wwid 36001438000091540a022878107d10000
alias rzalun1
path_grouping_policy multibus
path_checker tur
path_selector "round-robin 0"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
failback immediate
}

multipath {
wwid 36001438000091540a43289e8f2120000
alias rzalun2
path_grouping_policy multibus
path_checker tur
path_selector "round-robin 0"
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
failback immediate
}
.....
devices {
device {
vendor "COMPAQ "
product "MSA1000 "
path_grouping_policy multibus
path_checker tur
rr_weight priorities
}
}

multipath -ll (some lines):
rzalun6 (36001438000091540a153874bfe000004) dm-11 HP,MSA VOLUME
[size=279G][features=0][hwhandler=0]
\_ round-robin 0 [prio=2][active]
\_ 1:0:1:6 sdaa 65:160 [active][ready]
\_ 0:0:1:6 sdm 8:192 [active][ready]
params = 0 0 1 1 round-robin 0 2 1 8:176 1000 65:144 1000
status = 1 0 0 1 1 A 0 2 0 8:176 A 0 65:144 A 0
sdl: mask = 0x8
sdl: getprio = NULL (internal default)
sdl: prio = 1
sdz: mask = 0x8
sdz: getprio = NULL (internal default)
sdz: prio = 1




And sometimes i get the following error-lines in /var/log/messages:
Mar 16 04:02:03 sigraca01db syslogd 1.4.1: restart.
Mar 16 09:20:59 sigraca01db multipathd: sdaa: readsector0 checker reports path is down
Mar 16 09:20:59 sigraca01db multipathd: checker failed path 65:160 in map rzalun6
Mar 16 09:20:59 sigraca01db kernel: device-mapper: multipath: Failing path 65:160.
Mar 16 09:20:59 sigraca01db multipathd: rzalun6: remaining active paths: 1
Mar 16 09:20:59 sigraca01db multipathd: sdm: readsector0 checker reports path is down
Mar 16 09:20:59 sigraca01db multipathd: checker failed path 8:192 in map rzalun6
Mar 16 09:20:59 sigraca01db kernel: device-mapper: multipath: Failing path 8:192.
Mar 16 09:20:59 sigraca01db multipathd: rzalun6: remaining active paths: 0
Mar 16 09:21:04 sigraca01db multipathd: sdaa: readsector0 checker reports path is up
Mar 16 09:21:04 sigraca01db multipathd: 65:160: reinstated
Mar 16 09:21:04 sigraca01db multipathd: rzalun6: remaining active paths: 1
Mar 16 09:21:04 sigraca01db multipathd: sdm: readsector0 checker reports path is up
Mar 16 09:21:04 sigraca01db multipathd: 8:192: reinstated
Mar 16 09:21:04 sigraca01db multipathd: rzalun6: remaining active paths: 2
Mar 16 11:45:05 sigraca01db auditd[6371]: Audit daemon rotating log files
Mar 16 14:30:38 sigraca01db last message repeated 261 times
Mar 16 14:30:39 sigraca01db last message repeated 18 times
Mar 17 07:30:30 sigraca01db multipathd: sdd: readsector0 checker reports path is down
Mar 17 07:30:30 sigraca01db multipathd: checker failed path 8:48 in map rzclun4
Mar 17 07:30:30 sigraca01db multipathd: rzclun4: remaining active paths: 1
Mar 17 07:30:30 sigraca01db kernel: device-mapper: multipath: Failing path 8:48.
Mar 17 07:30:35 sigraca01db multipathd: sdd: readsector0 checker reports path is up
Mar 17 07:30:35 sigraca01db multipathd: 8:48: reinstated
Mar 17 07:30:35 sigraca01db multipathd: rzclun4: remaining active paths: 2

Any idea ?
Thanks
Ralf
2 REPLIES 2
Highlighted
Vincent Fleming
Honored Contributor

Re: MSA1000 in a RHEL 5.1 multipath environment

Hi Ralf,

The MSA1000 does not support RHEL MPIO drivers.

Also, be sure you have the MSA1000 in active/active mode (with the appropriate FW release to support it).

What multipath solutions you can use depend on the OS (32-bit or 64bit?) and the MSA configuration (active/active or active/passive). Please post this information and I'll tell you what your options are.

Good luck!
No matter where you go, there you are.
Highlighted
ossupport55
Frequent Advisor

Re: MSA1000 in a RHEL 5.1 multipath environment

Hiya Ralf, Please let me know if you are facing issues with RHEL 5.1 DM-multipath.
cheers