LSI Raid capacity expansion

Discussion in 'RAID Controllers and Host Bus Adapters' started by Alexandre, Jul 28, 2018.

  1. Alexandre

    Alexandre New Member

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    Hello everyone,

    I need you expertise on LSI 9361-8i raid controller.

    I have a 9361-8i with 6x 6TB WD Red drives in raid 6, running under windows 10 Pro.

    My question: if I swap drives 1 by 1 (e.g one by quarter) by 10TB drives, will I have the possibility at the end of the operation to expand the total capacity of the existing array ?

    Thanks in advance,
    Alexandre
     
    #1
  2. i386

    i386 Well-Known Member

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    It's possible but it's very time consuming and stresses the drives: first your rebuild the array for each drive, and then you do the online expansion.
     
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  3. Alexandre

    Alexandre New Member

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    Thanks for your answer,

    I’m aware it’s gonna take ages but time is on my side ;)

    Are you sure my raid card support it ?
    (I mean extending capacity after drive replacement with bicger sizes)

    Which function should I use ?
    Super thanks for your help !!!
     
    #3
  4. i386

    i386 Well-Known Member

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    I seriously hope you read the manual...
    1-2 weeks per drive + ~2 weeks for online expansion?
     
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  5. mobilenvidia

    mobilenvidia Moderator

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    I added 2x 2TB drives to my 6 Drive RAID6 array just over a month ago and this took 36 hours to expand
    The array become very slow but still usable for home stuff
    So changing a drive should not take any longer
    And this was on a 9285-8e

    BUT swapping a 6TB drive with a 10TB will create merry hayhem as the 9361 will most likely only use 6TB of the drive leaving 4TB empty
    Then at the end of it all you still only have 6x 6TB drives with 24TB wasted space
    All drives need to be identical, I doubt the controller can then expand the drives capacity to then be identical again (6TB to 10TB)
    Have you considered 2 more 6TB drives this will be easy to add as I said above
    or
    Get an expander or 2nd RAID controller (even a cheap 926x) and create a 10TB drive RAID 6 Array then copy the 6TB RAID6 Array over
     
    #5
  6. i386

    i386 Well-Known Member

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    This is why you do the onlince capacity expansion after replacing drives one by one.
     
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  7. Alexandre

    Alexandre New Member

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    Thanks for your replies.
    Buying another LSI card or 2 extra 6TB are not an option to me.
    I understand that swapping 6-->10TB then performing an online capacity expansion is feasible, even if needed it will take time.
    Thanks for your advices.

    Alexandre.
     
    #7
  8. vanfawx

    vanfawx Active Member

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    And I'll mention this since no one else has: Make sure you have a backup of this data if you care about it at all. Capacity expansion isn't fail proof. Do you have another copy of this data somewhere?
     
    #8
  9. Alexandre

    Alexandre New Member

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    Hello, yes I always have a recent backup that is offline and offsite, thanks for your concern :)
     
    #9
  10. vanfawx

    vanfawx Active Member

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    You're doing better than most then! Good luck with the process, and I hope it goes fast and smooth!
     
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  11. Alexandre

    Alexandre New Member

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    Thanks !
     
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  12. Stefan75

    Stefan75 Member

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    Why not get all 10TB drives at once and restore the data.. might be faster.
    You'd even have the 6TB array as a second backup.
     
    #12
    Tha_14 and chinesestunna like this.
  13. kapone

    kapone Active Member

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    I suspect it is due to that?
     
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  14. chinesestunna

    chinesestunna Active Member

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    I agree with this approach as well, if you have a backup copy not on the array then creating a fresh 6x10TB array and dumping data back is probably quickest (unless your offsite/offline is actually cloud in which case nevermind). Another idea, how filled is your 6x6TB array? If it's sub 20TB filled, you can JBOD 2 of the 10TB drives, then create new array with 4 10TB drives and grow array to 6 10TB drives after data has been moved.
    I have not done hardware RAID with bigger drive for array expansion, but software driven MDADM in Linux I have successfully moved a 10x2TB to 10x3TB by swapping each disk then growing array and filesystems.
     
    #14
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