Messages in this thread | | | Date | Fri, 5 Sep 2003 08:01:31 +0300 (EEST) | From | Catalin BOIE <> | Subject | 2.4.22 + RAID 1 + SATA + 2 disks => no maximum speed |
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Hi!
I have a machine with 2 SATA disks on 2 separate buses. hdparm -t /dev/hda reports 50MB/s hdparm -t /dev/hdb reports 50MB/s
I created a raid1 array with hda3 and hdc3, same partition sizes.
If I do hdparm -t /dev/md0 it reports 50MB/s
If I do cat /dev/md0 > /dev/null, vmstat reports 50MB/s If I start another cat /dev/md0 > /dev/null, in another console, I get 100MB/s from vmstat.
Why I don't get 100MB/s on a single cat command?
Some other test: cat /dev/hda3 > /dev/null& cat /dev/hdc3 > /dev/null& vmstat shows 100MB/s.
Also, seems that writing is very slow (8MB/s).
Any ideas?
Thank you very much!
--- Catalin(ux) BOIE catab@deuroconsult.ro - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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