[HPADM] RE: HP-UX Filesystem Block Size on SAN

Hello

It's depend of application you run. For example if you have oracle Is
recommended to make fs block equiv to database block



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Regards: Romeo Ninov

http://rninov.host-bg.info

Freedom, Sancho.....

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From: hpux-admin-owner@xxxxxxxxxxxxx [mailto:hpux-admin-owner@xxxxxxxxxxxxx]
On Behalf Of Daniel Keisling
Sent: Friday, January 25, 2008 7:37 PM
To: hpux-admin@xxxxxxxxxxxxx
Subject: [HPADM] HP-UX Filesystem Block Size on SAN



Hello,



Is the default block size of 8192 on HP-UX vxfs filesystems connected to a
SAN (specifically an EVA5000) okay for performance reasons? My rp4440's
can't seem to read more than 14MB/s and I'm having trouble finding the
cause. This has a dual-pathed 2GB fibre on two HBA cards using SecurePath
(latest version) with the LST load balanced policy running HP-UX 11i. CPU,
memory, and SCSI queue depth seem fine. I/O throughput just seems slow.
Other machines (Windows) can read up to 40MB/sec and seem to have great
performance.



Is there something I'm missing or is this inline with what other people see?
From attending multiple StorageWorks events, I hear HP touting way higher
I/O throughput numbers that what I can get.



TIA,



Daniel






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