failure in path between fc switch and storage: info request
I have some servers connected with two qlogic hba to two different fc switches.
Each fc switch is then connected to the two controllers of the storage
array (IBM DS6800), one port for each controller.
So my servers have 4 paths to a LUN.
They are RH EL 5.5 x86_64 with slghtly different minor versions of dm
I had a problem with the gbic of one of the fc switches, connected to
the controller od the storage array.
So in this case the servers lose a path.
After gbic replacement, I register different behaviours.
1) cluster of two servers that both have access to the storage
The same disk is seen in different mode by the two servers.
mpath3 (3600507630efe0b0c0000000000000804) dm-5 IBM,1750500
\_ round-robin 0 [prio=0][active]
\_ 1:0:1:8 sdaf 65:240 [active][undef]
\_ 0:0:1:8 sdp 8:240 [active][undef]
\_ round-robin 0 [prio=0][enabled]
\_ 0:0:0:8 sdh 8:112 [active][undef]
\_ 1:0:0:8 sdx 65:112 [active][undef]
here I have:
My relevant configuration in multipath.conf for all the systems is:
getuid_callout "/sbin/scsi_id -g -u -s /block/%n"
prio_callout "/sbin/mpath_prio_alua %d"
Also, in cluster nodes I have lines such as:
for binding, to have both nodes see the storage LUNS with the same name
It seems that 3) after about half an hour is returned ok.
But for example 2) continues to have group composition anomalies....
how to re-set as originally?
Thanks in advance,
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