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RAID HDD slot number, does it matter?

Tags:
  • SAS
  • NAS / RAID
  • Hard Drives
  • Western Digital
  • Storage
Last response: in Storage
March 29, 2013 2:21:05 AM

Hello all,
I have an LSI MegaRAID SAS 9261-8i Card with 7 WD RED 3TB HDDs connected to it.
I'm planning to get a new case to migrate the RAID Card to alongside the HDDs, does it matter which slot I put the HDDs back in? or does the RAID card automatically detect the order of the HDDs?
I'm also asking this because the new case I have in mind has a SAS backplate connector, so it might be numbered differently.

I have already asked 2 other questions regarding raid problem but no one in the forum replied them... I hope this time someone does answer ._.;
losing hope in this website~

Thanks~

More about : raid hdd slot number matter

March 29, 2013 3:06:40 AM

With sas/sata it does make a difference, on the old scsi 320 systems it didn't because the scsi id was set on the drives, just label the drives according to whichever slot they were in.
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Best solution

a b G Storage
March 31, 2013 9:02:05 AM

If you are using the MegaRAID controller to manager the 7xWD drives then the order you connect that back to the MegaRAID controller does not matter. When the drives are initialized the MegaRAID it writes RAID data to each drives so they can be easily identified regardless of which port they are connected. I had a the same question for my LSI controller so I switch the drives around in the existing case to test the theory. It worked as expected so I migrated to a new case without issue.
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March 31, 2013 11:55:43 AM

Nothing_But_NAS said:
If you are using the MegaRAID controller to manager the 7xWD drives then the order you connect that back to the MegaRAID controller does not matter. When the drives are initialized the MegaRAID it writes RAID data to each drives so they can be easily identified regardless of which port they are connected. I had a the same question for my LSI controller so I switch the drives around in the existing case to test the theory. It worked as expected so I migrated to a new case without issue.


Excellent, thanks for the info.
Though I have another question, is this the same case if I add a new SAS expander and connect the 7 HDDs to the SAS expander ports instead? (of course the sas expander will be connected to the RAID card)
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a b G Storage
March 31, 2013 2:06:59 PM

The same should apply with a SAS expander as it is simply a pass through device. I don't have one, so you will have to test to make sure. Before you boot the OS, go into the RAID BIOS and make sure the RAID is intact with the expander in place. If you don't want to take the plunge yourself, head over to the [H]ardForum and ask your question. There are tons of NAS builders using expanders in that forum.
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