we have DELL 6800 server with 12 internal disks in it. O.S. is CENTOS 4.6 and
SCSI control card is PERC 4e/di.
We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This logical volume
will be use as file systems and store database backup files.
Can anyone tell me which one is better on performance?
Thanks.
?????????Yahoo!??????2.0????????????? - ?????
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mcclnx mcc wrote:> we have DELL 6800 server with 12 internal disks in it. O.S. is CENTOS > 4.6 and SCSI control card is PERC 4e/di. > > We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This > logical volume will be use as file systems and store database backup > files. > > Can anyone tell me which one is better on performance?raid50 requires 2 or more raid 5 volumes. with 4 disks, thats just not an option. for file storage (including backup files from a database), raid5 is probably fine... for primary database tablespace storage, I'd only use raid1 or raid10.
You're going to need two RAID controllers and 6 drives to do RAID 50. RAID 50 will be faster, but costs more in drives and controllers. Jason www.cyborgworkshop.org mcclnx mcc wrote:> we have DELL 6800 server with 12 internal disks in it. O.S. is CENTOS > 4.6 and SCSI control card is PERC 4e/di. > > We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This > logical volume will be use as file systems and store database backup files. > > Can anyone tell me which one is better on performance? > > Thanks. > > ?????????Yahoo!??????2.0????????????? - *? > ???* > <http://tw.rd.yahoo.com/referurl/mail/mail20/tag_hot0103/*http://tw.mg0.mail.yahoo.com/dc/landing> > *?* > > > ------------------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos
>We plan to configure 4 disks (5,8,9,10) as RAID5 or RAID50. This logical volume will be use as file systems and store database backup files.I wouldn't use Raid 5 on a DB, the performance degradation during rebuild and low fault tolerance aren't appealing to me. jlc -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080522/4985542b/attachment-0005.html>
on 5-22-2008 9:58 PM Bahadir Kiziltan spake the following:> You need at least 6 drives for RAID5. I don't know if Perc 4e/Di > allows configuring the RAID5. >Where did you get this bit of information? You can create a raid 5 with 3 or more disks. -- MailScanner is like deodorant... You hope everybody uses it, and you notice quickly if they don't!!!! -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 258 bytes Desc: OpenPGP digital signature URL: <http://lists.centos.org/pipermail/centos/attachments/20080523/9d495b8a/attachment-0005.sig>
Scott Silva wrote:> on 5-22-2008 9:58 PM Bahadir Kiziltan spake the following: >> You need at least 6 drives for RAID5. I don't know if Perc 4e/Di >> allows configuring the RAID5. >> > Where did you get this bit of information? You can create a raid 5 > with 3 or more disks. > > ------------------------------------------------------------------------ > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >3 drives is not really recommended, since if 1 dies, you'll probably loose the whole set. Rather use min 4 drives, where 1 drive is a hot spare) -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff