Date: Tue, 9 Mar 2004 14:32:04 -0600 From: "adp" <dap99@i-55.com> To: <questions@freebsd.org> Subject: iostat and watching disk performance for Promise RAID.. Message-ID: <002b01c40615$f7d41dd0$6401a8c0@yourqqh4336axf>
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My disk device is /dev/ar0:
# mount
/dev/ar0s1a on / (ufs, local)
/dev/ar0s1h on /home (ufs, local, soft-updates)
/dev/ar0s1e on /tmp (ufs, local, soft-updates)
...
Yet iostat shows /dev/adX:
n# iostat 5
tty ad0 ad4 ad6 cpu
tin tout KB/t tps MB/s KB/t tps MB/s KB/t tps MB/s us ni sy in id
0 3 0.00 0 0.00 0.00 0 0.00 0.00 0 0.00 2 2 26 1 69
0 448 0.00 0 0.00 15.43 24 0.37 14.80 26 0.37 4 0 9 4 84
0 541 0.00 0 0.00 6.67 1 0.00 6.00 3 0.02 12 0 16 6 66
0 730 0.00 0 0.00 4.84 6 0.03 5.67 9 0.05 4 0 12 8 77
0 483 0.00 0 0.00 2.00 0 0.00 2.00 0 0.00 9 0 10 5 76
...
Is iostat simply breaking out my RAID-1 (/dev/ar0) into its two component
drives? If I had three drives composing /dev/ar0 would I then see ad0, ad4,
adX?
/dev/ad6 here is just a drive we use for short-term backups, and is not
RAID.
I just want to confirm. Thanks!
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