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тАО07-24-2002 02:14 AM
тАО07-24-2002 02:14 AM
XP - performances.
xp512 with disc groups in raid 5.
4 FC of high performance.
8Gb memory cache.
lv's with striping of 4 discs and with block size of 256k.
dd with bs=256k gives 8Mb, the disc uses it to 12%.
5 dd bs=256k gives 80Mb/seg.
Oracle uses raw device with block size of 8k.
I need to improve much the performances.
I need that oracle writes many GB in just a short time.
ideas ?
4 FC of high performance.
8Gb memory cache.
lv's with striping of 4 discs and with block size of 256k.
dd with bs=256k gives 8Mb, the disc uses it to 12%.
5 dd bs=256k gives 80Mb/seg.
Oracle uses raw device with block size of 8k.
I need to improve much the performances.
I need that oracle writes many GB in just a short time.
ideas ?
3 REPLIES 3
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тАО07-24-2002 06:23 AM
тАО07-24-2002 06:23 AM
Re: XP - performances.
General rules:
1. make your LV block size 64k.
2. use LDEVs (luns) from as many array groups as possible (stripe across AGs)
3. use the same # of luns from each ACP pair. (stripe across ACPs)
Note that "dd" is not a good performance metric.
Good luck
1. make your LV block size 64k.
2. use LDEVs (luns) from as many array groups as possible (stripe across AGs)
3. use the same # of luns from each ACP pair. (stripe across ACPs)
Note that "dd" is not a good performance metric.
Good luck
No matter where you go, there you are.
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тАО07-24-2002 10:44 PM
тАО07-24-2002 10:44 PM
Re: XP - performances.
Hi,
Instead of blockstriping try to use "extend-based" striping (with the default extentsize of 4 MB).
Regards,
Mark
Instead of blockstriping try to use "extend-based" striping (with the default extentsize of 4 MB).
Regards,
Mark
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тАО07-26-2002 04:16 AM
тАО07-26-2002 04:16 AM
Re: XP - performances.
- you have to look for best performance of server (cpu and memory and io !) and xp512 and oracle !
- if you have a xp512 i think you have an hp support engineer for xp-config
- use few disks (over all channels) only for oracle redo-logs, strip all other tablespaces over all other disks
- make "correct" application-tests for extend-based-stripping and ??K-stripping (16,32,64,..) and check the performance (not only io) with sar, glance, perfview,..
- check oracle-performance (statspack) and optimize init.ora
- if you have a xp512 i think you have an hp support engineer for xp-config
- use few disks (over all channels) only for oracle redo-logs, strip all other tablespaces over all other disks
- make "correct" application-tests for extend-based-stripping and ??K-stripping (16,32,64,..) and check the performance (not only io) with sar, glance, perfview,..
- check oracle-performance (statspack) and optimize init.ora
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