Re: asm on san

From: Mladen Gogala <>
Date: Thu, 11 Dec 2008 15:32:14 +0100
Message-ID: <ghr89f$qpv$>

helter skelter wrote:

> Hi,
> I'm preparing to test some configurations on san storage array. I would
> like to find out what will be better in my environment: raid1+0 or
> raid5. Other thing is what size of segment size should be configured on
> storage array. For example, I've got 5 disks in RAID5, so if ASM default
> stripe size for datafiles is 1MB, so segment size on strage shouls be
> 256KB to hit all drives, am I right?
> What tools are You recommend to do tests like this: sequentail/sequence
> reads etc? thanks
> oracle 10gr2, rhel5

RAID 5 is not good for databases, period. Not for data files, especially not for the log files, you can only use RAID 5 partition for log_archive_dest_25 If your boss told you to evaluate RAID 5, it is very likely that he wants to save some money in the wrong place and will buy you RAID 5, no matter what your findings are. Moan Isnogood has a great site at The abbreviation "BAARF" stands for "Battle Against Any Raid Five". Your company is probably doomed and will not make it through the recession. Have a nice day.

Received on Thu Dec 11 2008 - 08:32:14 CST

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