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mixing 10Krpm and 15Krpm for RAID 1

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Robert Gabanes
Occasional Visitor

mixing 10Krpm and 15Krpm for RAID 1


We've got a DL380-G3 with a failed mirror drive(10,000rpm), i was wondering i do have a spare for my other server which is a DL380-G4(15,000rpm)

Have any one tried RAID 1 with HDD of diffent rotation speed. Just wondering if the controller will handle the diffrence in writing/reading speeds. TY
6 REPLIES
Brian_Murdoch
Honored Contributor
Solution

Re: mixing 10Krpm and 15Krpm for RAID 1

Hi Robert,

Yes it works 100% as the 15K drives are backward compatible with existing configurations. On the maintenance side we generally receive U320 15K drives for older defective U2 and U3 10K models as the older drives become unavailable and HP standardise on U320 SCSI replacements.

It's not a problem providing the capacity in Gb is the same or larger than the original drive. The drive mechanics and SCSI bus take care of transactions.

http://www.tek-tips.com/viewthread.cfm?qid=1354235&page=1

Similar questions are answered here.
http://h18004.www1.hp.com/products/servers/proliantstorage/drives-enclosures/hotplug-ultra3/questionsanswers.html

I hope this helps.

Brian


Aneesh Mohan
Honored Contributor

Re: mixing 10Krpm and 15Krpm for RAID 1

Hi Robert ,

It will work , we have the mix in EVA Raid.


Thanks,
Aneesh
David Claypool
Honored Contributor

Re: mixing 10Krpm and 15Krpm for RAID 1

It will work but the overall throughput wlll be a lot closer to the 10K drive speed than the 15K drive speed. In other words, it won't perform at the average of the 2.
James ~ Happy Dude
Honored Contributor

Re: mixing 10Krpm and 15Krpm for RAID 1

Hello Robert,

In Addition to David, You may have MANY "SCSI Downshift" errors (in the ADU report) resulting in performance issues.

Regards,
James.
tkc
Esteemed Contributor

Re: mixing 10Krpm and 15Krpm for RAID 1

hi robert,

yes you can mix. but it's better to have same rpm disks in the same disk group.

here is a document on best practices for the hp eva array :

http://h71028.www7.hp.com/ERC/downloads/4AA0-2787ENW.pdf
RaMpaNTe
Trusted Contributor

Re: mixing 10Krpm and 15Krpm for RAID 1

Don't worry Robert, you can safely use the 1K drive and mix it with a 10K one... about performance... Nothing will be affected. The drives will work fine.
You heve a question... I have an aswer!!!