Perf. SuperStore

[Ash_4]

Hi Masters,
Pl explain the significance of the output of following commands.

# arraydsp -m 05201000 05201800 12

Vendor ID = HP
Product ID = C5447A
Array serial number = 00000025FB31
Performance Metrics
--------------------------------------------------------------------------------
Requested Period = 10:00 05/20/2002 to 18:00 05/20/2002
Actual Period = 10:45 05/20/2002 to 18:30 05/20/2002
Interval = 4

Out-of-Spec Indicator = *
--------------------------------------------------------------------------------
Drive Relocate Working Cache SCS
Difference Blocks Set Util
05/20/2002
10:45 0.000 0.010 *5.660 0.000 51.00
11:45 0.000 0.000 *5.510 0.000 51.00
12:45 0.000 0.000 *5.320 0.000 47.00
13:45 0.000 0.020 *5.100 0.000 52.00
14:45 0.000 0.000 *4.920 0.000 55.00
15:45 0.000 0.000 *4.830 0.000 43.00
16:45 0.000 0.000 *4.750 0.000 53.00

--------------------------------------------------------------------------------

Cache Host Through IO Concurrenc
Q Q Put Rate Metri
05/20/2002
10:45 0.110 0.000 1664640.000 53.000 51.00
11:45 0.080 0.000 1270272.000 52.000 51.00
12:45 0.090 0.000 1114752.000 46.000 47.00
13:45 0.060 0.000 878208.000 25.000 52.00
14:45 0.060 0.000 372224.000 21.000 55.00
15:45 0.070 0.000 362368.000 18.000 43.00
16:45 0.100 0.000 2633088.000 67.000 53.00

--------------------------------------------------------------------------------



# arraydsp -r 05201000 05201800 12

Vendor ID = HP
Product ID = C5447A
Array serial number = 00000025FB31
Performance Recommendations (10:00 05/20/2002 to 18:00 05/20/2002):
--------------------------------------------------------------------------------
Add another disk array because the write working set is too large.

The number of write I/Os being performed by the host on a daily basis
is consistently exceeding the amount of RAID1 space available to service
them. This results in decreased performance because some writes must be
serviced from RAID 5 space. Adding another disk array to increase the amount
of available RAID1 space should improve performance.