Another strange thing:
I now started a "dd if=/dev/dm-0 of=/dev/null bs24k".
For the first seconds(!), it did nothing, I thought it would hang.
Then it started, but it's reading in a strange way:
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
xvdg 139378,24 0,00 15893,61 0,00 77640,82 0,00 9,77
35,96 2,26 0,06 99,88
xvda 0,00 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00
xvde 0,00 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00
xvdb 0,00 0,00 0,00 0,00 0,00 0,00 0,00
0,00 0,00 0,00 0,00
dm-0 0,00 0,00 155241,52 0,00 77620,76 0,00 1,00
353,51 2,28 0,01 99,88
Very many I/Os and very slow KB/s. What could cause that?
lv readahead is 1536 sectors, that's 128KB per data disk (a 7 disk RAID-5) and
should be OK.
--
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc
it-management Internet Services: Protéger
http://proteger.at [gesprochen: Prot-e-schee]
Tel: +43 660 / 415 6531
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