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тАО10-18-2004 07:36 PM
тАО10-18-2004 07:36 PM
Raw device vs. Fs. In HP-cluster
i have low performance with Raw device Rac Oracle database, the same database in FS run fine! . I have read many forum document in Metalink, but i don't know what change for eliminate low performance.
I use already ASYNC_IO = TRUE , i have a lot of buffer cache of OS..where i can find a solution?
Thanks.
Best regards.
Francesco
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тАО10-18-2004 07:42 PM
тАО10-18-2004 07:42 PM
Re: Raw device vs. Fs. In HP-cluster
RAC is always slower than standard installation.
What is your hardware configuration ?
Do you use 1Gb link between cluster node1 for synchronization ?
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тАО10-18-2004 07:47 PM
тАО10-18-2004 07:47 PM
Re: Raw device vs. Fs. In HP-cluster
yes i have interconnect with 1Gb and switch(private ip).
My hardware it's two node with 3 itanium processor for node and 10Gb of memory.
The same database in single instance in PA-RISC processor plataform (4 processor) it's faster.
The disk are the in the same box, in two plataform , HP-VA with san network fddi .
Best regards.
Francesco
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тАО10-18-2004 08:13 PM
тАО10-18-2004 08:13 PM
Re: Raw device vs. Fs. In HP-cluster
I think that you should start with some performance test especially for disk: (glance, sar, iostat) - look at %busy do disks.
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тАО10-18-2004 08:20 PM
тАО10-18-2004 08:20 PM
Re: Raw device vs. Fs. In HP-cluster
ok i can do it , but the Cluster it's free of any charge! I test with a simple large select in one only table in one only Oracle tablespace/raw device.
The wait for read it's high, but i don't know a reason. I/o statistics i think it's powerful for many access to all disks.
Regards.
Francesco
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тАО10-18-2004 08:50 PM
тАО10-18-2004 08:50 PM
Re: Raw device vs. Fs. In HP-cluster
do you have the latest Oracle patches
- maby it is some Oracle bug.
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тАО10-18-2004 08:55 PM
тАО10-18-2004 08:55 PM
Re: Raw device vs. Fs. In HP-cluster
yes i have lastest patch 9.2.0.5 RAC Itanium
Not bug with Raw in Itanium are reported in metalink..
Regards.
FRancesco
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тАО10-19-2004 06:21 PM
тАО10-19-2004 06:21 PM
Re: Raw device vs. Fs. In HP-cluster
the problem it's in different speed when HP-UX use FS o RAw device. I will open other thread for this.
Thanks.
Best regards.