Hi Jijo, did you try bonnie in these tests? Bonnie is a much better
stress tester.
On Fri, 31 Aug 2001, Federico Sevilla III wrote:
> Some follow-up stuff:
>
> I ran the sequential write tests using dd as in:
>
> # time dd if=/dev/zero of=/opt/test/test.img bs=1M count=3000
>
> with three settings that aren't XFS-related but are NFS-specific. Namely,
> the wsize and rsize settings of NFSv3.
>
> - 8192 - - 32768 - - 65535 -
> real 8m23.713s 8m0.675s 8m39.662s
> user 0m0.010s 0m0.020s 0m0.040s
> sys 0m34.890s 0m35.350s 0m35.480s
>
> The differences don't seem to be that significant, but I'm going with
> 32768 since my system is using pure NFSv3 and not NFSv2. Besides, this is
> set in the client side so an NFSv2 client can always use 8192 for both
> rsize and wsize. Anyway, this is off-topic for the XFS list (sorry).
>
>
> An observation about disk activity:
>
> Disk activity is pretty continuous, which is good. However there are
> situations where disk activity will stop but network activity continuous.
> I presume this is filling up some buffer. Then disk activity will pick up
> and network activity will stop for awhile. I presume aggressive flushing
> of buffers is going on. This doesn't look quite like "streaming" to me.
> I'm not complaining, but just thought I'd relay the tidbit in the hopes of
> getting some enlightenment.
>
>
> Some notes on my system:
>
> o I'm using RAID5, and even if this is hardware RAID, RAID5 writes are
> not so good. I should have gone RAID10, but it's too late to shift now.
>
> o I created the filesystems using "-l size=32768b" in mkfs.xfs
>
> o I mount the filesystems using
> "rw,noatime,nodiratime,logbufs=8,biosize=16,osyncisdsync"
>
> :-)
>
> "Very happy with NFS+XFS"
> --> Jijo
>
> --
> Federico Sevilla III :: jijo@xxxxxxxxxxxxxxxxxxxx
> Network Administrator :: The Leather Collection, Inc.
> GnuPG Key: <http://jijo.leathercollection.ph/jijo.gpg>
>
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