| To: | Asdo <asdo@xxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Disappointing performance of copy (MD raid + XFS) |
| From: | Kristleifur Daðason <kristleifur@xxxxxxxxx> |
| Date: | Thu, 10 Dec 2009 09:44:28 +0000 |
| Cc: | xfs@xxxxxxxxxxx, linux-raid <linux-raid@xxxxxxxxxxxxxxx> |
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| References: | <4B204334.1000605@xxxxxxxxxxxxx> |
On Thu, Dec 10, 2009 at 12:39 AM, Asdo <asdo@xxxxxxxxxxxxx> wrote: > Hi all, > > I'm copying a bagzillion of files (14TB) from a 26disk MD-raid 6 array to a > 16disk MD-raid 6 array. > Filesystems are XFS for both arrays. > Kernel is 2.6.31 ubuntu generic-14 > Performance is very disappointing, going from 150MB/sec to 22MB/sec > depending apparently to the size of files it encounters. 150MB/sec is when > files are 40-80MB in size, 22MB/sec is when files are 1MB in size on > average, and I think I have seen around 10MB/sec when they are of 500KB > (this transfer at 10MB/sec was in parallel with another faster one however). This may not be related, but I have had some general problems regarding transfer rates in Ubuntu. Using a vanilla kernel seemed to help: http://kernel.ubuntu.com/~kernel-ppa/mainline/ -- Kristleifur |
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