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Old 12-24-2004, 05:38 PM   #1
Registered: Jun 2001
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SCSI slow?

Does this look right to you? I'm sure I have /dev/sdb working at 40mb/sec before... it's 160mb/sec max anyway.

Code:[~] # df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/hda6             9.7G  3.4G  5.8G  37% /
/dev/hdb2              74G   36G   34G  52% /s
/dev/hda4             6.1G  5.1G 1003M  84% /mnt/fat32
/dev/sdb3              17G  4.3G   12G  27% /usr
/dev/sda1             4.1G  663M  3.4G  17% /usr/portage[~] # hdparm -Tt /dev/sdb

 Timing cached reads:   1188 MB in  2.00 seconds = 592.61 MB/sec
 Timing buffered disk reads:   94 MB in  3.06 seconds =  30.68 MB/sec[~] # hdparm -Tt /dev/sda

 Timing cached reads:   1184 MB in  2.00 seconds = 591.79 MB/sec
 Timing buffered disk reads:   24 MB in  3.08 seconds =   7.79 MB/sec[~] # hdparm -Tt /dev/hda

 Timing cached reads:   1188 MB in  2.00 seconds = 593.79 MB/sec
 Timing buffered disk reads:   82 MB in  3.02 seconds =  27.17 MB/sec[~] #
Old 12-25-2004, 02:18 AM   #2
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If you are saying that you have a U160 scsi drive, that would be its maximum burst data transfer rate, not the sustained data transfer rate with is what hardparm tells you, but I'm not sure if that is what you are asking.
Old 12-26-2004, 12:29 AM   #3
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7MB/sec does seem a bit slow for a disk drive. (I use USCSI tape drives at work that accept data at a higher rate than that.) Not knowing anything about the configuration of the OS or the hardware, it's a little tough to tell if there's a serious problem here just from looking at the output of few hdparm commands. There are just too many questions one would want to ask. Such as: Do you see numbers like this when you run these tests in single user mode? What do you have on the "slow" drive? etc...


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