2950 write performance issues

McDougall, Marshall (FSH) Marshall.McDougall at gov.mb.ca
Fri Jun 8 15:08:27 CDT 2007


>-----Original Message-----
>From: Derek Yuen [mailto:derek.yuen at utoronto.ca] 
>Sent: Friday, June 08, 2007 2:41 PM
>To: McDougall, Marshall (FSH)
>Subject: Re: 2950 write performance issues
>
>
>Hi Marshall,
>
>Could you provide some metrics as to what you'd consider as "poor write
>performance" (perhaps writeKB, IOPs ?)
>
>
>
>Thanks,
>Derek
>--
>Derek Yuen
>Computing & Network Services
>University of Toronto
>
>
>
>
>On Fri, 8 Jun 2007, McDougall, Marshall (FSH) wrote:
>
>> I have several identical 2950's that have very inconsistent write
>> characteristics.  They all have 8GB ram, 6 x 146 GB SAS drives in a
>> single raid10 config. The bios is at 1.3.7, ESM backplane at 
>1.05, A01
>> and PERC at 1.03.10-0216.  Each server is running RHEL4U5, Sybase ASE
>> 12.5.4.  I have one server that chugs along at an acceptable level,
>> compared to a 2550, and rest have write statistics that are up to 100
>> times worse depending on if it's an Insert, Commit, Delete, etc.
>>
>> I have compared the RAID config, with megacli, in all cases 
>and they are
>> identical.  I am running out of ideas.  I would appreciate any fresh
>> approaches that are offered. Hell, I'll even take old stale 
>ones just to
>> make sure I haven't missed anything :)  Thanks.
>>
>> Regards, Marshall
>>
>
 Here's an example.  Sorry for the formatting, but you get the idea.

Regards, Marshall

 TEST                      Srvr1   Srvr2
Insert1K.out     Time	   0.040   4.224
Copy1K.out       Time	   0.007   0.064
JoinPK1K.out     Time	   0.007   0.010
JoinNK1K.out     Time	   0.030   0.033
CommitSmallTX1K.out      Time   0.070   4.260
CommitBigTX1K.out        Time   0.043   0.284
Update1K.out     Time	   0.007   0.090
Delete1K.out     Time	   0.004   0.043
Insert10K.out    Time	   0.390   42.246
Copy10K.out      Time	   0.060   0.440
JoinPK10K.out    Time	   0.083   0.080
JoinNK10K.out    Time	   0.186   0.467
CommitSmallTX10K.out     Time   0.723   42.703
CommitBigTX10K.out       Time   0.423   2.813
Update10K.out    Time	   0.017   0.800
Delete10K.out    Time	   0.026   0.404
Insert100K.out   Time	   4.987   417.410
Copy100K.out     Time	   0.470   4.393
JoinPK100K.out   Time	   0.827   0.820
JoinNK100K.out   Time	   1.980   4.613
CommitSmallTX100K.out    Time   7.120   441.480
CommitBigTX100K.out      Time   4.500   29.320
Update100K.out   Time	   0.143   7.967
Delete100K.out   Time	   0.193   6.560
CreateLargeVol.out       Time A   0.003   0.074
CreateLargeVol.out       Time B   0.007   0.216
CreateLargeVol.out       Time C   0.010   0.110
CreateLargeVol.out       Time D   0.053   0.897
CreateLargeVol.out       Time E   0.550   5.647
CreateLargeVol.out       Time F   6.047   51.980
CreateLargeVol.out       Time G   6.106   64.223
CopyLargeVol.out         Time A   0.000   0.026
CopyLargeVol.out         Time B   0.003   0.027
CopyLargeVol.out         Time C   0.000   0.037
CopyLargeVol.out         Time D   0.017   0.063
CopyLargeVol.out         Time E   0.136   0.190
CopyLargeVol.out         Time F   1.517   1.523
CopyLargeVol.out         Time G   1.553   1.600  



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