On 06/11/2014 05:00 PM, Victor Echavarry Diaz wrote:
We install a couple of EC12 to our shop, upgrade some server to SLES
11 SP3 kernel 3.0.101-0.15-default under z/VM 6.2. When we execute
the VMRELOCATE for some reason the SAN file system go read only. Our
previous configuration was an EC10, SLES 10 SP2 under z/VM 6.2. The
VMRELOCATE here works fine. Does anyone see this issue before? The
SAN is an IBM V7000. The Storage, Unix and DBA groups said their
configurations are ok.
Just a shot in the dark:
The builtin device-mapper multipath settings and documentation for SVC /
V7000 probably recommend something like "no_path_retry 5" in
/etc/multipath.conf.
Since you temporarily lose all paths at the same time unavoidably during
LGR, you might need to reconfigure multipathing to always queue I/O
requests when all paths are gone instead of returning EIO (I/O error)
which in turn typically causes file systems to remount read-only (sooner
or later).
Queueing requests can be configured with:
"no_path_retry queue" (or its alias feature "queue_if_no_path").
https://www.suse.com/documentation/sles11/stor_admin/data/bbillhs.html
https://www.suse.com/documentation/sles11/stor_admin/data/bbj68de.html
https://www.suse.com/documentation/sles11/stor_admin/data/bbi89rh.html#b122sbgo
https://www.suse.com/documentation/sles11/stor_admin/data/be5rvii.html#bok8cn1
(actually I recommend to disable dev_loss_tmo entirely which might be
the SLES default anyway)
https://www.suse.com/documentation/sles11/stor_admin/data/mpioerrormgmt.html
https://www.suse.com/documentation/sles11/stor_admin/data/mpiostall.html
in case you use LVM:
http://www.novell.com/support/kb/doc.php?id=7007498
--
Mit freundlichen Grüßen / Kind regards
Steffen Maier
Linux on System z Development
IBM Deutschland Research & Development GmbH
Vorsitzende des Aufsichtsrats: Martina Koederitz
Geschaeftsfuehrung: Dirk Wittkopp
Sitz der Gesellschaft: Boeblingen
Registergericht: Amtsgericht Stuttgart, HRB 243294
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