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тАО10-14-2003 07:53 PM
тАО10-14-2003 07:53 PM
Let's say I have two disks connected to separate scsi card.
0/0/6/0/0.8.0 sdisk DEVICE /dev/dsk/c2t8d0 --- diskA
0/0/0/3/0.5.0 sdisk DEVICE /dev/dsk/c0t5d0 --- diskB
In this case, is it possible that diskA slows down when diskB is busy?
I thought that if connected to separate scsi card, those disks don't interfere each other, so there is no slowdown.
But I noticed diskA might have been very slow when diskB was very busy.
Solved! Go to Solution.
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тАО10-14-2003 09:32 PM
тАО10-14-2003 09:32 PM
Re: disk performance on rp7410
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тАО10-14-2003 09:46 PM
тАО10-14-2003 09:46 PM
Re: disk performance on rp7410
i agree with Mark. To know the past performance of the 2 disks. install perfview.
Mostly it is installed you can try running the command "pv" on X windows display. because of high swapping some disks appear to give slow response. try to create some swap logical volume. on the other disk and set the same priority at original disk. Hope this solves ur problem.
Saurav
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тАО10-15-2003 06:09 AM
тАО10-15-2003 06:09 AM
Solutionrad -q
2. rad -q shows you which i/o card is in which slot:
# rad -q
Driver(s)
Slot Path Bus Max Spd Pwr Occu Susp Capable Max Mode
Num Spd Mode
0-0-0-1 0/0/8/0 64 N/A 66 On Yes No Yes N/A N/A
0-0-0-2 0/0/10/0 80 N/A 66 On Yes No Yes N/A N/A
0-0-0-3 0/0/12/0 96 N/A 66 On Yes No Yes N/A N/A
0-0-0-4 0/0/14/0 112 N/A 66 On Yes No Yes N/A N/A
0-0-0-5 0/0/6/0 48 N/A 33 On No N/A N/A N/A N/A
0-0-0-6 0/0/4/0 32 N/A 33 On No N/A N/A N/A N/A
0-0-0-7 0/0/2/0 16 N/A 33 On No N/A N/A N/A N/A
0-0-0-8 0/0/1/0 8 N/A 33 On No N/A N/A N/A N/A
0-0-1-1 1/0/8/0 64 N/A 33 On No N/A N/A N/A N/A
0-0-1-2 1/0/10/0 80 N/A 33 On No N/A N/A N/A N/A
0-0-1-3 1/0/12/0 96 N/A 33 On No N/A N/A N/A N/A
My rp7410 has two cell boards, a 0 board and a 1 board.
c0t5d0 is on the "internal" card for the boot disk, DVD and tape drive. c2t8d0 is on the same cell board, but is connected to a SCSI (or fibre) card.
However the answers above are probably right. Your root and swap are probably on c0t5d0, and that could slow down system performance when high root access or swap.
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тАО10-16-2003 12:53 AM
тАО10-16-2003 12:53 AM
Re: disk performance on rp7410
# diskinfo -v /dev/rdsk/c0t5d0
Vendor and product ID
Device type
Size (in bytes and in logical blocks)
Bytes per sector
Revision level
###########################################
SCSI disks on SCSI buses have target priorities. If there are other devices on the SCSI bus then priorities become an issue.
Target t8 in c2t8d0 should have the lowest priority while target t5 in c0t5do should be third highest highest priority. There are 16 targets. 7 is highet, 8 is lowest.
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тАО10-20-2003 01:56 PM
тАО10-20-2003 01:56 PM
Re: disk performance on rp7410
I will check what's going on.