W2TR# 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 -------------------------------------------------------------------------------- W2TR# 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.