From: Smith, Kevin (Kevin.Smith@sbs.siemens.co.uk)
Date: Fri Sep 19 2003 - 03:20:08 EDT
We have a strange and serious issue with T3 array performance please read on
.......
Config:
4 x T3 trays configured in partner pairs
4 x T3 Lun's configured and showing in Solaris 8
1 x VxVM Volume striped down 4 columns and using all trays
2 x pairs directly connected to HBA on Fire4810
There are no errors on the T3's or in the syslog. Our problem is read
performance on the volume. It is used for business objects reporting.
3 of the trays have extactly the same disks: 36GB Seagates : ST336605F and
the other tray has 36GB Seagates: ST336704F.
The follow table shows the performance comparison:
T3 Tray KB/s Service (ms)
T30_0 20447.4 50.2
T30_1 34317.9 30.4
T31_0 48971.5 20.9
T31_1 47174.8 21.7
This is driving us all round the bend. Can anyone shed some light on why
this is happening. We need to ensure that IO is balanced across all four
trays as it should be with a stripe.
Thanks very much in advance.
Kev Smith
> ----------------------------------------------------
> Kev Smith
> Unix Systems Administrator.
> Operational Support, IND Croydon.
> * E-Mail : kevin.m.smith@siemens.com
> * Tel : 0208 7604849
> * Mobile : 07808 828595
> ----------------------------------------------------
> Siemens Business Services Ltd
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> Registered Office: Siemens House, Olbury, Bracknell,
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>
>
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>
> ----------------------------------------------------
> Kev Smith
> Unix Systems Administrator.
> Operational Support, IND Croydon.
> * E-Mail : kevin.m.smith@siemens.com
> * Tel : 0208 7604849
> * Mobile : 07808 828595
> ----------------------------------------------------
> Siemens Business Services Ltd
> This e-mail contains confidential information and is for the
> exclusive use of the addressee/s. If you are not the addressee, then any
> distribution, copying or use of this e-mail is prohibited. If received in
> error, please advise the sender and delete it immediately. We accept no
> liability for any loss or damage suffered by any person arising from use
> of this e-mail.
>
> Siemens Business Services
> Registered No: 1203466 England
> Registered Office: Siemens House, Olbury, Bracknell,
> Berkshire,
> RG12 8FZ
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