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Home -> Community -> Mailing Lists -> Oracle-L -> Arch configuration -- I/O stuck
Hi list,
Oracle 7.3.4
HP-UX
log_archive_buffer_size=32 (redo log blocks = 1K)
log_archive_buffers=4
Filesystem based (no direct I/O)
I've been detecting that my box gets stucked
eventually for some time.
When this happens I can't do even a "ls" (it
actually executes it but it takes a long time).
If I check my cpu with TOP, I see 47% idle time and
there's no process monopolizing the CPU.
But when I check disk activity with sar -d I see
that one disk is 100% busy and it's avwait+avserv >
1000 ms. The other disks are fine.
I then check disk activity with Glance and I can
identify the process that's writting/reading on this
disk is: ARCH (ARCH is writting a 1.9 GB redo log.)
So here are my doubts:
1)If only one disk is saturated (I've got about 30 disks in this box (a SYMMETRIX array) with some controllers), why does the whole box get stucked? why are even other applications connected to other instances running on this box affected? (may be because the HP-UX LVM system gets saturated???)
2) What can I do to avoid this problem?, (reduce log_archive_buffers parameter may be, or increase log_archive_buffer_size)
help me on this
Thanks
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