[Bug 824790] Re: IBM DS3400 Will Not Bring Up Second Path
Peter Petrakis
peter.petrakis at canonical.com
Fri Aug 12 19:05:49 UTC 2011
So the paths not showing up with a config file error, a few well
placed regexp and a proper blacklist to filter out the internal disks
solved that. Also added scsi_dh_rdac to initial ramdisk. Now the paths
are up, and stay up. However when we tried testing failover using
a scsi "delete" of the primary member. The secondary never became
active.
We asked the customer to check with any additional SAN side
config, like automatic lun transfer, is necessary. Depending on how
that turns it we may actually have a real failover bug.
Working multipath config, taken almost verbatim from the IBM
documentation: Section 5-10.
ftp://ftp.software.ibm.com/systems/support/system_x_pdf/94y8402.pdf
# Canonical Customer Support: 08/12/11
# Version 1.2
blacklist {
devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
devnode "^hd[a-z]"
# Ignore internal storage from the LSI RAID
device {
vendor LSILOGIC
product .*
}
}
devices {
device {
vendor "IBM"
product ".*"
path_grouping_policy group_by_prio
path_checker rdac
getuid_callout "/lib/udev/scsi_id -g -u -d /dev/%n"
prio_callout "/sbin/mpath_prio_rdac /dev/%n"
hardware_handler "1 rdac"
failback immediate
# rr_weight uniform
no_path_retry 30
rr_min_io 100
features "2 pg_init_retries 50"
}
}
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https://bugs.launchpad.net/bugs/824790
Title:
IBM DS3400 Will Not Bring Up Second Path
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