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тАО08-24-2003 06:32 PM
тАО08-24-2003 06:32 PM
choice of raid on database ...
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тАО08-24-2003 07:30 PM
тАО08-24-2003 07:30 PM
Re: choice of raid on database ...
RAID 5 Ideal for data mart/data warehouse applications with many users that require mostly unique scans on its tables and indexes. RAID 5 provides better IOPS than RAID 3.
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тАО08-24-2003 07:49 PM
тАО08-24-2003 07:49 PM
Re: choice of raid on database ...
Explanation: A full mirror copy of the logical volume the database is sitting on.
This can be accomplished with mirror/ux(software raid) or with hardware raid. I've found that throughput is better with the software raid, though there are those that would argue with me.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
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тАО08-24-2003 07:53 PM
тАО08-24-2003 07:53 PM
Re: choice of raid on database ...
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тАО08-24-2003 07:58 PM
тАО08-24-2003 07:58 PM
Re: choice of raid on database ...
in my situation, if LVM is used as a replacement for hardware mirror, since mirror write cache and mirror consistency is mutaully exclusive, then what option is best? Should I opt. to go with mirror conistency and not mirror write cache? Please share your experience as to what opt. is best for this situation? Thanks.
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тАО08-24-2003 11:48 PM
тАО08-24-2003 11:48 PM
Re: choice of raid on database ...
I could not find any documentation for your RAID controller but, if it only support 0 3 and 5 and you plan to use 0 for the controller and software mirroring I doubt if you have any use of the controller at all. You can do striping/mirroring with LVM as well and most of the LWM overhead is with the mirroring, not with the striping. In your case I would try some benchmark to see if a software mirroring performs better then a hardware RAID 5.
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тАО08-25-2003 12:12 AM
тАО08-25-2003 12:12 AM
Re: choice of raid on database ...
This is what is recommended (raid 0 = stripes, raid 1 = mirrors, raid 5 = striping+parity):
A. no raid, raid 0 or raid 0+1 for online redo logs AND control files.
You should let Oracle multiplex them even if you mirror them. There are more opportunities for failure if the raid subsystem reports a "warning" back to us -- if we have multiplexed them -- we are OK with that.
B. no raid or raid 0 for temporary datafiles (used with temporary tablespaces). no raid/raid 0 is sufficient. If you lose these, who cares? You want speed on these, not reliability. If a disk fails, drop and recreate temp elsewhere.
C. no raid, raid 0 or raid 0+1 for archive. Again, use Oracle to multiplex if you use no raid or raid 0, let the OS do it (different from online redo log here) if you use 0+1.
D. raid 0+1 for rollback. It get written to lots. It is important to have protected. Oracle cannot multiplex them so let the OS do it. Use this for datafiles you believe will be HEAVILY written. Bear in mind, we buffer writes to datafiles, they happen in the background so the poor write performance of raid 5 is usually OK except for the heavily written files (such as rollback).
E. raid 5 (unless you can do raid 0+1 for all of course) for datafiles that experience what you determine to be "medium" or "moderate" write activity. Since this happens in the background typcially (not with direct path loads and such) -- raid 5 can typically be safely used with these. As these files represent the BULK of your database and the above represent the smaller part -- you achieve most of the cost saving without impacting performance too much.
Try to dedicate specific devices to
- online redo
- archive
- temp
they should not have to share their devices with others in a "perfect" world (even with each other).
hope this helps!
Regards
Yogeeraj
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тАО08-25-2003 05:47 AM
тАО08-25-2003 05:47 AM
Re: choice of raid on database ...
the raid card I'm using is 4si scsi card on DS2300 running in halfbus mode. Which didn't give what I wanted. I wanted hardwared raid 0 + 1. Not a mixture of hardware raid 0, then software raid-1. If someone knows that this can do hardware raid 0 + 1 (IN HALFBUS MODE), then please enlightenment me. Otherwise please let me know from experience whether "mirror write cache" is prefer over "mirror consistency" when mirroring oracle datafiles? Thanks.
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тАО08-25-2003 06:31 AM
тАО08-25-2003 06:31 AM
Re: choice of raid on database ...
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x028193e260b0d611abdb0090277a778c,00.html
Anyway don't forget you can use LVM for stripping and if you have mirror-ux you can do the whole lot with the OS.
Rgds,
JL