# [OmniOS-discuss] Warning that partition is too large when mirroring identical disks in root pool

Warren Marts protonwrangler at gmail.com
Fri Feb 7 17:54:01 UTC 2014

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    This may be a genuine mismatch between the disks.

    A few weeks ago I was trying to image between two apparently identical
    Western Digital RE2 400GB drives. They were produced on the same day and
    their serial numbers were only ~200 apart, but the disk utility reported
    block counts that differed by about 20,000 (10 MB) and neither count
    matched the one on the disk label.

    I was surprised, to say the least.

    On Fri, Feb 7, 2014 at 10:14 AM, Willard Korfhage <omniti at familyk.org>wrote:

    > I just installed OmniOS r151008j last night, and today I wanted to mirror
    > rpool, but have a warning about the disk size. I have 2 Seagate 1TB disks
    > (model ST1000LM024HN), and my OmniOS install is on one of them. I told the
    > install to use the whole disk. Some version of OpenIndiana was previously
    > installed on the disk. The install went without any problem.
    >
    > c2t0d0 is the disk with OmniOS
    > c2t1d0 is supposed to be its mirror
    >
    > To do the mirroring, following the directions in the wiki, I did
    >
    > root at s1:~# pfexec fdisk -B c2t1d0p0
    > root at s1:~# pfexec prtvtoc /dev/rdsk/c2t0d0s2 | pfexec fmthard -s -
    > /dev/rdsk/c2t1d0s2
    > fmthard: Partition 2 specifies the full disk and is not equal
    > full size of disk. The full disk capacity is 1953407610 sectors.
    > fmthard: Partition 2 specified as 1953471870 sectors starting at 0
    >  does not fit. The full disk contains 1953407610 sectors.
    > fmthard: New volume table of contents now in place.
    >
    > At this point I stopped, and haven't done the mirror.
    >
    > For the disk with the install, format reports
    >
    > Current Disk = c2t0d0
    > <ATA-ST1000LM024HN-M-0001 cyl 60797 alt 2 hd 255 sec 126>
    > /pci at 0,0/pci8086,1c02 at 1f,2/disk at 0,0
    >
    > and further information is
    >
    > root at s1:~# pfexec prtvtoc /dev/rdsk/c2t0d0s2
    > * /dev/rdsk/c2t0d0s2 partition map
    > *
    > * Dimensions:
    > *     512 bytes/sector
    > *     126 sectors/track
    > *     255 tracks/cylinder
    > *   32130 sectors/cylinder
    > *   60799 cylinders
    > *   60797 accessible cylinders
    > *
    > * Flags:
    > *   1: unmountable
    > *  10: read-only
    > *
    > * Unallocated space:
    > *       First     Sector    Last
    > *       Sector     Count    Sector
    > *           0     32130     32129
    > *
    > *                          First     Sector    Last
    > * Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
    >        0      2    00      32130 1953375480 1953407609
    >        2      5    01          0 1953471870 1953471869
    >        8      1    01          0     32130     32129
    >
    > Any idea what is going on?
    >
    > I tried to format the disk without the install (c2t1d0), just to start
    > with a completely fresh disk, but it doesn't work. This appears to be a
    > long-standing (11-month old) Illumos bug (https://www.illumos.org/
    > issues/3610)
    >
    >
    > _______________________________________________
    > OmniOS-discuss mailing list
    > OmniOS-discuss at lists.omniti.com
    > http://lists.omniti.com/mailman/listinfo/omnios-discuss
    >
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