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Hardware Thread, Time to Offline Rebuild an Array? in Technical; We have a 4 disk RAID 10 array of 500GB Seagate Barracuda ES.2 on an Intel SRCS16. The controller is ...
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    doofusdog's Avatar
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    Cool Time to Offline Rebuild an Array?

    We have a 4 disk RAID 10 array of 500GB Seagate Barracuda ES.2 on an Intel SRCS16.

    The controller is SATA 1

    One of the drives has failed. Beeps and a very grindy noise.

    How long to rebuild after I replace the disk? I'd prefer to do an offline rebuild.. I just need to know is it an evening job or a weekend one?

    I have done it once before about 4 years ago and the my memory is a bit fuzzy.

    thanks!
    Craig

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    SYNACK's Avatar
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    One 500GB drive is probably an overnight build depending on the speed of the array. I would say that an offline build is much safer and quicker with a lower end controller like the ones that the intel boards contain. It will almost certainly complete overnight short of another hardware issue occouring.

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    doofusdog (10th May 2011)

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    mjs_mjs's Avatar
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    I rebuilt my raid 1 array on an SIS controller (less than 30 jobby) over night. I did the same array in online mode and it took ni on a day to complete.

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    doofusdog's Avatar
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    hmmm I'm going to give it a test run on my other identical and not so important server.. the SRCS16 card was $300-400 USD so not a cheapy.. I'll let you know

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    SYNACK's Avatar
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    Quote Originally Posted by doofusdog View Post
    hmmm I'm going to give it a test run on my other identical and not so important server.. the SRCS16 card was $300-400 USD so not a cheapy.. I'll let you know
    Ah, fair enough, I just hear intel and RAID in the same sentence and it gives me a bit of a shiver given the experiences that I have had with intel raid stuff.

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    doofusdog's Avatar
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    from 1% to 2% took 10 minutes = 16.3 hours for 100%.. so it should be finished by about lunchtime tomorrow given I started at 8.25pm (ish)

    so that would be Fri 6pm til around 10am Saturday for example

    I'm doing an offline build with the rate set to 100%

    I'll wait til 3% and see if it's constant.. OK it is!!

    So it's around 70Mb/s which sounds slow!

    Craig
    Last edited by doofusdog; 10th May 2011 at 10:05 AM.

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    SYNACK's Avatar
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    Quote Originally Posted by doofusdog View Post
    from 1% to 2% took 10 minutes = 16.3 hours for 100%.. so it should be finished by about lunchtime tomorrow given I started at 8.25pm (ish)

    so that would be Fri 6pm til around 10am Saturday for example

    I'm doing an offline build with the rate set to 100%

    I'll wait til 3% and see if it's constant.. OK it is!!

    So it's around 70Mb/s which sounds slow!

    Craig
    70MB/s is about right for a SATA drive on a SATA1 bus. It is limited by the write rate of the destination drive so that kind of speed sounds about right.

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    doofusdog's Avatar
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    nah 70 Mbit/s

    so slow. but I've googled around an that seems about right for a RAID rebuild on 4 year old hardware.. 91% done now.

    Craig

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    Quote Originally Posted by doofusdog View Post
    nah 70 Mbit/s

    so slow. but I've googled around an that seems about right for a RAID rebuild on 4 year old hardware.. 91% done now.

    Craig
    Damn thats slow, that works out to about 8.5MB/s, I can get 35MB/s off an old single sata drive in my home PC so I'm guessing that its rebuilding does a lot of extra checking even when ramped up to 100%. At least its almost done now.

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