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11-14-2009 11:44 PM
11-14-2009 11:44 PM
Timing cached reads performance fall DL585
I updating DB server from DL385 to new DL585, I have performance fall.
Tests show:
HP DL385
hdparm -T /dev/cciss/c0d0p1
/dev/cciss/c0d0p1:
Timing cached reads: 6426 MB in 2.00 seconds = 3215.23 MB/sec
HP DL585
hdparm -T /dev/cciss/c0d0p1
/dev/cciss/c0d0p1:
Timing cached reads: 1844 MB in 2.00 seconds = 922.00 MB/sec
RAID state id OK
hpacucli controller all show config
Smart Array P400 in Slot 9 (sn: PAFGL0P9SWY1MQ)
array A (SAS, Unused Space: 0 MB)
logicaldrive 1 (33.9 GB, RAID 1+0, OK)
physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 36 GB, OK)
physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 36 GB, OK)
I changed various BIOS settings, kernel settings and kernels, but it haven’t good effect.
What can I do to correct it? Thanks!
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11-15-2009 04:18 AM
11-15-2009 04:18 AM
Re: Timing cached reads performance fall DL585
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11-15-2009 07:05 AM
11-15-2009 07:05 AM
Re: Timing cached reads performance fall DL585
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11-16-2009 02:31 PM
11-16-2009 02:31 PM
Re: Timing cached reads performance fall DL585
Cheers
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11-16-2009 04:58 PM
11-16-2009 04:58 PM
Re: Timing cached reads performance fall DL585
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11-20-2009 06:49 PM
11-20-2009 06:49 PM
Re: Timing cached reads performance fall DL585
It measures transfer time from the RAM cache.
It is a measure of the RAM read rate.
A decrease in the reported "hdparm -T" rate may point to a problem with installing DIMMS in a proper high performance arrangement
Or it might be a side effect of NUMA vs. SUMA memory arrangement which will differ between a DL385 and larger systems like a DL585. You could check DIMM arrangement with dmidecode and experiment with changing the BIOS SUMA/NUMA setting.
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