Sandy Drobic wrote:
David C. Rankin wrote:
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned.
That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2):
mordor:~ # hdparm -tT /dev/mapper/system-var
/dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec
Here's the data of my old server (old pci hardware raid, 3 x 18 GB SCSI): /dev/rd/c0d0p3: Timing cached reads: 298 MB in 2.00 seconds = 148.70 MB/sec Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec Quite a difference. (^-^) -- Sandy List replies only please! Please address PMs to: news-reply2 (@) japantest (.) homelinux (.) com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org