Hi,
We're currently working on development of a new system, and I've just noticed
a performance problems; the CPU utilisation seems to be constantly around
or over
50% for system related requests ..
What I have:
2 x Alpha 4000's 5/300 512 MB RAM in a DECsafe configuration
Local storage on each machine, 4 MB RAID 1 (2x rz29b on SWXCR)
Shared storage, 3 x rz29b, each mirrored onto another drive on a second bus
using LSM.
i.e. rz17 <-> rz25, rz18 <-> rz26 and rz19 <-> rz27
Disks are on BA35X shelves going to KZPSA's using DWZZB's
I'm using AdvFS for fast crash recovery etc.
On my shared storage, each LSM mirror is a separate fileset, in it's own
filedomain.
I am running Oracle 7.3.3
I have looked at resource utilisation:
approx 280 MB RAM is free
swap has 80% free
I/O across drives is sporadic, with bursts of up to 300 kbps (at the
worst), but on
average, bursts of about 30-60 kbps.
volstat reports occaisional I/O consistent with the above.
I've checked uerf/dia, and there are no errors etc.
Tools I've used; iostat, vmstat, swapon, monitor, volstat, uerf
And yet, performance is sluggy, with the system utilising a constant 50-60%
CPU ..
Anyone have ideas? I can't see it .. is it something obvious I am just not
seeing?
thanks in advance,
gunther
Received on Tue Nov 11 1997 - 02:55:07 NZDT