Re: small i & power systems (disk performance) -- MIDRANGE-L

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Kirk Goins wrote:

You need to collect some basic performance data.. Mainly how many Disk I/O per second you are doing now under your normal load conditions. The 8GB drives 'MIGHT' me 10K at best and the controllers may have 104MB cache depending on the card. The SAS drives are 15K and according to IBM are 10% to 15% faster than their SCSI counter parts.

According to PPT slide I have the internal raid controller can handle 1100 to 1400 I/O per second as long as individual drives do not exceed 110 I/O per second

Thanks for the info.

The 640 has 1 PCI & 2 SPD expansion units. 3x 2748 (26Mb cache) controllers and 40x 6717s. 2x 6512 (4Mb cache) controllers, 1x 6751 (no cache) and 32x 6713s.

From what I can tell, disk I/O appears low enough through most of the day (my calc is under 450K per/sec), but peaks at approx 1900K when running our end of month processing.

The BP has collected performance data and suggested 12x 4327 in CEC and 5095 w/5583 (5777 w/cache). I've asked for more details on the analysis.

Keith

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