[linux-lvm] (no subject)

Heinz J . Mauelshagen mauelshagen at sistina.com
Mon Jun 30 09:51:28 UTC 2003


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...
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


Heinz    -- The LVM Guy --

*** Software bugs are stupid.
    Nevertheless it needs not so stupid people to solve them ***


Heinz Mauelshagen                                 Sistina Software Inc.
Senior Consultant/Developer                       Am Sonnenhang 11
                                                  56242 Marienrachdorf
Mauelshagen at Sistina.com                           +49 2626 141200
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