[sles-beta] R: Problems with XFS over Logical Volume

[Bonazzoli Giandomenico - Technogym SPA]

Q: What disks are you using?
It is an hardware raid5  group of 4 SAS disks 15.000 rpm

Q: Are you writing to the same disk you're reading from?
YES

Q: USB, iSCSI, ...?
SAS

Q: How big is that file?
Uncompressed 108511993856

Q: How does it perform if you instead write the output to "nowhere" (gzip -dc edwu.dmp.gz >/dev/null)?

I gave the following command instead:

cat edwh.dmp > /dev/null    # OK 400MB/s and the file system esponds well
cat edwh.dmp > a.a    # 20MB/s in write and the file system is extremely slow to espond 
dd if=edwh.dmp of=a.a bs=8192  # 18066702336 bytes (18 GB) copied, 55,8945 s, 323 MB/s .... but file system doesn't respond well
cat edwh.dmp | gzip -c > a.a   # hangs... it takes minutes to process Control-C


-----Messaggio originale-----
Da: sles-beta-bounces at lists.suse.com [mailto:sles-beta-bounces at lists.suse.com] Per conto di Lars Marowsky-Bree
Inviato: giovedì 24 luglio 2014 10:38
A: sles-beta at lists.suse.com
Oggetto: Re: [sles-beta] Problems with XFS over Logical Volume

On 2014-07-23T16:01:39, Bonazzoli Giandomenico - Technogym SPA <gbonazzoli at technogym.com> wrote:

> I think that very is a huge hole in SLES 12 beta10 using XFS over a logical volume:
> 
> This is the vmstat that shows performance problems, and it happens also that the server need to bee rebooted because after some minutes the file system hangs.

What disks are you using? Are you writing to the same disk you're reading from? USB, iSCSI, ...?

> P.S. : The "terrible" load is generated by a simple gzip -d 
> edwh.dmp.gz

How big is that file? How does it perform if you instead write the output to "nowhere" (gzip -dc edwu.dmp.gz >/dev/null)?




Regards,
    Lars

--
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 21284 (AG Nürnberg) "Experience is the name everyone gives to their mistakes." -- Oscar Wilde

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