[Ocfs-users] A couple more minor questions about OCFS and RHEL3

Derek Suzuki DSuzuki at ZipRealty.com
Sat Mar 6 22:13:12 CST 2004


 Oracle appears to have Wim chained in the basement, forced to answer
mailing list questions at all hours.  I do appreciate it.
 Our cluster has been stable since we installed RAC, but a few minor issues
have me concerned.  First, our storage array seems to maintain continuous
low-level activity even when the database is shut down.  The CPUs spend a
modest amount of time in iowait state while this is going on.  I figure this
might be related to the I/O fencing and inter-node communication features of
OCFS, but I want to verify that this is expected.
 Next, I saw a Metalink thread which suggests that async I/O is not
supported on OCFS with RHAS 2.1.  It doesn't say anything about RHEL3.
We've been using async in our testing with no problems so far, and plan to
use it in production unless Oracle feels the combination is not yet
trustworthy.
 The last issue is that sometimes we see  messages such as the following
from dmesg:

(11637) ERROR: status = -16, Common/ocfsgendlm.c, 1220
(11637) ERROR: status = -16, Common/ocfsgendlm.c, 1285
(11637) ERROR: status = -16, Common/ocfsgendlm.c, 1586
(11637) ERROR: status = -16, Common/ocfsgencreate.c, 1027
(11637) ERROR: status = -16, Common/ocfsgencreate.c, 1770
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1220
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1285
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1586
(12717) ERROR: status = -16, Common/ocfsgencreate.c, 1027
(12717) ERROR: status = -16, Common/ocfsgencreate.c, 1770
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1220
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1285
(12717) ERROR: status = -16, Common/ocfsgendlm.c, 1586
(12717) ERROR: status = -16, Common/ocfsgencreate.c, 1027
(12717) ERROR: status = -16, Common/ocfsgencreate.c, 1770

 I think these mostly come up around boot time, so maybe they're related to
mounting cluster filesystems when the other node is down.  The messages do
not come continuously, and the systems behave properly, so I'm just trying
to make sure that this isn't the sign of some subtle error.

Derek


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