Expanding an HP array (MSA1000)?

Posted on 2009-12-21
Last Modified: 2013-11-14

I'm trying to create a new logical unit on an HP Array (MSA1000 - 200 GB in RAID5). It seems to take AGES!? Or is that normal?

How long until I can actually use the harddisk space from this logical unit?


Question by:Xeronimo
    LVL 55

    Expert Comment

    4GB/hour is a worst-case for RAID 5 expansion on a an MSA1000, so a day or so is normal. You can change the expansion priority but I wouldn't bother, better to leave it on low so host access isn't slowed.

    If you're using MS clustering it may never complete because the cluster traffic to the quorum never leaves a 15 second quiet time and only workaround I know for that is stop the cluster service.

    Author Comment

    Hm ... I had it running for a couple of days now and it still hadn't finished ... the information message actually said it was still 'in queue or working'!? But why would it be in a queue? There's nothing else going on on the MSA?

    That's why I deleted that logical unit (which still didn't actually, really exist, there was still the (i) icon next to it) and started again. That's where I am now. I've still got the same message.

    By the way: how do I change the language of the Array Configuration Utility? Then I can post the message here in English ... it's in French now by default.


    Author Comment

    Here is the message as translated by Google:

    786 A parity initialization in the background is pending or underway on logical unit 7 (200.0 GB, RAID 5). If it is pending, it start at the same time as the I / O unit. At the end of the process, performance of the logical unit improve.

    Does this refer to the parity initialization of the logical unit I'm trying to create? Because there's nothing else pending ... But, as I've said, I had this message for days now?

    Author Comment

    Still the same message, still no access to the logical unit ... is that normal?
    LVL 55

    Accepted Solution

    Until you access the LUN (LUN 7) background parity will not start, and until background parity scrubbing is completed the expansion will remain queued. So you have two jobs in the queue, your parity generation and your expansion. You have to create some I/O to kick off background parity generation, you can do that by making a file system on it. Then parity generation will start, take a day or so, and only then the expansion will start.

    Background parity on any LUN will cause the queue of background tasks to stall, for example if you create LUN1 and LUN2, create a file system on LUN 2 and try to expand it it will never start because background parity is still queued on LUN1 until some I/O is started on LUN1.

    Author Comment


    What is the LUN7?

    And how do I put a file system on the logical unit? I don't see it anywhere yet ... Also I'm not expanding anything right now? I'm just trying to create a logical unit?

    And the info bar of the ACU only shows this one info message ... Where would I see what exactly is queued?

    Sorry for being so confused ;)

    Thanks again.

    Author Comment

    Oh, wait there is something else:

    I had created a test logical unit of 4 GB before creating the 200 GB one. I've deleted that 4 GB logical unity but it still gets shown in the Windows Disk Management tool? That's as it's supposed to be, right?

    Maybe that is the thing in the queue?

    Author Comment

    Oh, wait again ... I hadn't attributed the logical unit to a server ... therefore I didn't see it in Disk Management. Have done that now! Guess that resolves my problem ... d'oh.

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