[linux-lvm] Poor performance with LVM 1.0.7
ha at thedudes.nu
Wed Aug 27 07:59:06 UTC 2003
> check the raw performance of one drive involved
> with hdparm -tT ...
Did that, it reported between 27-45MB/s on all drives (ranging from the system harddrive to the LVM
> > After scouring the net for suggestions on how to improve the speed, I came
> > up empty, and thus, I'm writing this email :)
> > Some more facts (more available if needed ;)) about the server:
> > All drives are tuned with 32bit transfers and DMA enabled. I'm running
> > kernel 2.4.22pre2 (gentoo).
> just for the fun of doing it, compile vanilla
> 2.4.22 and give it a try ... you could also add
Oki, will try it as soon as I get home.
> the following lvm patch ...
Hmm? What does this patch do?
> was the performance you had on your old box higher?
> or did you just expect an increase in speed, which didn't
Performance on my old box was lower, so I expected it to increase with my new system. And it did, as
long as I don't serve any files from the volumeset, everything runs just fine (9.5MB/s) but whenever I
try to access files on the LV, I get 4-5MB/s ...
Even tried doing:
time cat "somefile on the LV set" > /dev/null
Which performed equally bad (ie, about 4-5MB/s). Doing the same on the /dev/hda1 drive gives ALOT
better performance (more in the line of what hdparm -Tt reports)
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