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From: "Florian D." <>
To: Neil Brown <>
Subject: Re: cannot add device to partitioned raid6 array
Date: Sun, 01 Apr 2007 09:25:27 +0000	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <17935.8101.815473.709581@notabene.brown>

Neil Brown wrote:
> On Saturday March 31, wrote:
>> hi list!
>> in short:
>> I created a partitioned raid6 array with 2 missing drives. Now, I want to add a device. It fails with:
>> flockmock ~ # mdadm -a /dev/md_d4 /dev/sdb2
>> mdadm: add new device failed for /dev/sdb2 as 4: Invalid argument
> Thanks for the detailed problem report.
> I think the cause of the error is that /dev/sdb2 is too small.
> It needs to be at least 490030594 sectors. How big is it?

but the *device* size should be only ~250GB, so the array size is ~500GB, no?

flockmock ~ # mdadm --detail /dev/md_d4
         Version : 00.90.03
   Creation Time : Sat Mar 31 19:48:58 2007
      Raid Level : raid6
      Array Size : 490030464 (467.33 GiB 501.79 GB)
   Used Dev Size : 245015232 (233.66 GiB 250.90 GB)

these disks are all 250 GB harddisks, formatted in the same way -- but they are from different 
vendors! The block sizes from the partitions vary a little bit (taken from /sbin/fdisk):

/dev/sda2: 245015347
/dev/sdc2: 245015347
/dev/sdb2: 244099642  -> different vendor

do you think that may be the cause?

thanks a lot,

  reply	other threads:[~2007-04-01  9:25 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-31 23:44 Florian D.
2007-04-01  2:57 ` Neil Brown
2007-04-01  9:25   ` Florian D. [this message]
2007-04-01 10:07     ` Neil Brown
2007-04-01 11:23       ` Florian D.

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