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new disk is smaller than replaced
https://3parug.net/viewtopic.php?f=18&t=3246
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Author:  ran [ Wed Jul 17, 2019 1:00 pm ]
Post subject:  new disk is smaller than replaced

I have replace a failed drive on my 3par. Started the servicemag start, replace the drive then servicemag resume. Resume failed because the new disk is smaller than replaced. But the new disk has a new ID and is giving me a normal status.

Will I just continue on doing a dismiss on the old ID? since it has a new one and has a normal status?

Or Ill return the failed drive, do a servicemag start again?

Author:  MammaGutt [ Wed Jul 17, 2019 1:19 pm ]
Post subject:  Re: new disk is smaller than replaced

Replacing a big drive with a smaller drive doesn't fly with servicemag. The replacement will always get a new PDID but it sounds to me that your new drive has been admitted to the system as an upgrade and not as a replacement for the failed drive.

Do a showpd -c to check if any spare chunklets are still used.

Author:  ailean [ Thu Jul 18, 2019 4:10 am ]
Post subject:  Re: new disk is smaller than replaced

Also is the new disk actually smaller then the old one?

If they are both the same spec/size then it might just be a change of model/revision and the new drive could just have a slightly smaller number of sectors which meant the 3PAR can't recreate the exact number of chunklets as the old one (like maybe one less).
We've seen this a few times, if this is the case then you can tell servicemag to ignore this issue and just continue with the rebuild (with the -partial option).

But yeah if one was 600GB and the other 900GB you'll want to replace it again. :)

Author:  ran [ Fri Jul 19, 2019 12:18 pm ]
Post subject:  Re: new disk is smaller than replaced

Hello MammaGutt, OK, fail, Free in spare chunklets are 0 so I think there is no spare

Hello ailean, both are on the same size but our 3par sees the new disk as less space.

Author:  ran [ Sat Jul 20, 2019 10:48 am ]
Post subject:  Re: new disk is smaller than replaced

Hello MammaGutt and ailean,

Appreciate your help here. My issue has been fixed with the -partial option, telling the 3par to ignore the issue. Also before -partial option work, I have to make sure that there are no spare chunklet being. I did this by moving the spare. Learned a lot from the both of you. Thanks again!

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