RE disks with poor performance

From: M selcukkaraca <selcuk.karaca_at_aski.gov.tr>
Date: Thu, 30 Mar 2000 15:17:02 -0800

Dear friends,

I have very slow disks with SWXCR controller (RAID 0 on it)
I got the follwing from the "advfsstat XXX_domain" (XXX_domain is on re1 disk). I could not find any info on how to comment on the output
(man pages are no so informative ). So I need your help . Is there any problem with the disk ?

Domain -881443551.230430- Stats -

Deref 12 Refhit 9 Refhitwait 0 R_ahead 29
Unpin 35 Pinhit 10 Pinhitwait 0 Pinreads 0
Lazy 35 Log 0 Blocking 0 Clean 0
                 Ubchit 15 Unconsol 0 ConsolAbort 0
                 UnpinMeta 0 UnpinFtx 0 UnpinData 35
                 DerefMeta 9 DerefFtx 9 DerefData 3

Disk Reads Writes Rglobs AveRglob Wglobs AveWglob
---- ----- ------ ------ -------- ------ --------
   1 21 35 6 82 0 0


and also I tried uaio (which is very useful) but i could not see my re1..4 disks (just re0 ) and
re0's performance is very poor. How can i understand what is the reason for this. (look at ms/tr which is average time for each transfer - many more than others (SCSI's) ). And some times my system suspends (it is a DB server)

000330.145901 Sleep:1 Iterations:0
   Total rz8 rz9 rz10 rz11 re0 fd0 fd0 fd0 fd0 cpu
 kbs tps kbs tps kbs tps kbs tps kbs tps kbs tps kbs tps us ni sy wa id
 214 7 65 2 37 1 16 1 63 2 33 2 . . . . . . . . 7 0 2 10 81

Boot: 00/03/29 18:08:51 alpha 2*467 |
       00/03/30 14:59:01 V4.0 |
                transfer tps ms/tr kbytes kbs

Bus# 1: 4: 418179 6 20.3 13545042 181
Ctl# 20: 2: 132514 2 943.5 2509650 33

Total 2: 9: 550693 7 483.1 16054691 214

Disk rz8 : 140596 2 21.6 4886234 65
Disk rz9 : 53914 1 27.5 2743476 37
Disk rz10 : 101679 1 11.5 1162938 16
Disk rz11 : 121990 2 22.9 4752394 63
Disk re0 : 132514 2 943.5 2509650 33
Disk fd0 : . . . . .
Disk fd0 : . . . . .
Disk fd0 : . . . . .
Disk fd0 : . . . . .

cpu User 10533.8 7% |
cpu Nice 0.1 0% |
cpu System 3699.0 2% |
cpu Wait 15012.2 10% |
cpu Idle 120810.3 81% |


and the last question how can i trace re1..4 disks .

thanx in advance for your time, all people there

selcuk.karaca_at_aski.gov.tr
Received on Thu Mar 30 2000 - 12:17:49 NZST

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