Thank you for the response.
My logical volume is striped - 7 ways.
I am writing to the lv with a simple c program I wrote.
Each write is 7*stripesize, which in this case is 28 blocks.
Any thoughts on how I can get top speeds without mounting and unmounting the volume?
Thanks, Howie
> Howard,
> what's the LV layout (linear/striped ?). > How do you write to the LV (dd or soemthing). > What's the write pattern (sequential ? block size ?)
> 80MB/sec raw sounds like you use a striped LV.
On Sun, Jun 29, 2003 at 12:08:34PM -0400, Howard Clifford wrote: > I built a 7 disk vg and put 1 lv on it. I do not want to mount a file > system. > I just want to write directly to the disk device, /dev/vg1/vol1. > > My write performance has an odd behavior. > If after booting I write to the volume I get roughly 175MB/sec. > If after booting I do a mke2fs on the volume, mount it, umount it, then > write to the volume I get roughly 230 MB/sec. > > Any ideas? How can I get top speed without first mounting then > umounting the volume? > By the way, I tried binding a raw device to the lv and got very bad > performance; around 80 MB/sec. Would that be expected? > > (I'm using redhat 9.0 -> lvm-1.0.3-12) > > Thanks... > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@sistina.com > http://lists.sistina.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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Regards, Heinz -- The LVM Guy --
*** Software bugs are stupid.
Nevertheless it needs not so stupid people to solve them ***=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
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Senior Consultant/Developer Am Sonnenhang 11
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Mauelshagen@Sistina.com +49 2626 141200
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