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Top Forums UNIX for Advanced & Expert Users Different multipath softwares for RAC Post 303025578 by Peasant on Tuesday 6th of November 2018 06:37:48 AM
Old 11-06-2018
Yes, it's the same as volume groups.

Each has a unique identifier in header.
For instance on Linux or HPUX, if you run vgscan, whatever names are there the import will work if all the disks are there with same VGID.

ASM works the same, after it can see the disks using ASM_DISKSTRING.
Using MPXIO the path to be used in software won't actually be /scsi_vhci/... but rather /dev/[r]dsk/c0t ...
... being storage controller wwn + LUN ID

Check the correlation with ls -lrt /dev/rdsk/<some fc disk>
And doing luxadm display /dev/rdsk/...s2
Numbers will be matched.t.

This is what i do not like about linux multipath and those default /dev/sd[abcefg...]
But you can always rewrite the multipath configuration file to create mapper device files in similar fashion Smilie

Regards
Peasant
This User Gave Thanks to Peasant For This Post:
 

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MULTIPATH(8)						   Linux Administrator's Manual 					      MULTIPATH(8)

NAME
multipath - Device mapper target autoconfig SYNOPSIS
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-t|-F] [-p failover|multibus|group_by_serial|group_by_prio|group_by_node_name] [device] DESCRIPTION
multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them OPTIONS
-v level verbosity, print all paths and multipaths 0 no output 1 print the created or updated multipath names only, for use to feed other tools like kpartx 2 + print all info : detected paths, coalesced paths (ie multipaths) and device maps -h print usage text -d dry run, do not create or update devmaps -l show the current multipath topology from information fetched in sysfs and the device mapper -ll show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...) -f flush a multipath device map specified as parameter, if unused -F flush all unused multipath device maps -t print internal hardware table to stdout -p policy force maps to specified policy: failover 1 path per priority group multibus all paths in 1 priority group group_by_serial 1 priority group per serial group_by_prio 1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-con- troller or per-multipath option in the configuration file group_by_node_name 1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name. device update only the devmap the path pointed by device is in. device is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format. device may alternatively be a multipath mapname SEE ALSO
multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8) AUTHORS
multipath was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others. July 2006 MULTIPATH(8)
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