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Replace failed drive in pool

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Operating Systems Solaris Replace failed drive in pool
# 1  
Old 12-18-2014
Replace failed drive in pool
I am not very savvy with Solaris but am responsible for a server running Solaris 10 that has a failed hard drive in a mirrored pool. I ordered a new drive and attempted to install but received the error "device too small" when using zpool replace. The drive is the same Seagate model number as the old one and has the same nominal capacity of 300GB. Here's what prtvtoc says about the disks. Note that c1t0d0s2 is the new drive.
Code:
# prtvtoc /dev/dsk/c1t0d0s2
  * /dev/dsk/c1t0d0s2 partition map
  *
  * Dimensions:
  *     512 bytes/sector
  *    4470 sectors/track
  *       2 tracks/cylinder
  *    8940 sectors/cylinder
  *   65535 cylinders
  *   65533 accessible cylinders
  *
  * Flags:
  *   1: unmountable
  *  10: read-only
  *
  *                          First     Sector    Last
  * Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
         0      2    00          0 585865020 585865019
         2      5    01          0 585865020 585865019
  # prtvtoc /dev/dsk/c1t1d0s2
  * /dev/dsk/c1t1d0s2 partition map
  *
  * Dimensions:
  *     512 bytes/sector
  *     625 sectors/track
  *      20 tracks/cylinder
  *   12500 sectors/cylinder
  *   46875 cylinders
  *   46873 accessible cylinders
  *
  * Flags:
  *   1: unmountable
  *  10: read-only
  *
  *                          First     Sector    Last
  * Partition  Tag  Flags    Sector     Count    Sector  Mount Directory
         0      2    00          0 585912500 585912499
         2      5    00          0 585912500 585912499

From what I read, I understand that a mirrored pool cannot shrink. So since I'm not really familiar with all of this, I ask why cant I just create a new pool? Can this be done without loosing the data on c1t1d0s2?
# 2  
Old 12-18-2014
When it says "drive too small" it almost certainly means just that.

Drive manufacturers have a habit of using the same part number/model number for slightly different size drives to give their product line some resemblance of continuity.

If you can, put both drives on a desk and, hopefully, both disk drives will have a LBA (logical block capacity) on their labels. These are big numbers but compare them. Chances are that the number of LBA's on the new drive is less than the number of LBA's on the old drive. Solaris won't like that since when the old drive was configured Solaris used the full available capacity.

You need a drive with the same or greater number of LBAs which will be the number that Solaris is interested in. The new drive can be the same number of LBAs as the old drive or any number greater but NOT a single LBA smaller.

Hope that helps.
# 3  
Old 12-18-2014
Please post "iostat -En" output. I this SPARC hardware ?
# 4  
Old 12-18-2014
Quote:
Originally Posted by hicksd8
When it says "drive too small" it almost certainly means just that.

Drive manufacturers have a habit of using the same part number/model number for slightly different size drives to give their product line some resemblance of continuity.

If you can, put both drives on a desk and, hopefully, both disk drives will have a LBA (logical block capacity) on their labels. These are big numbers but compare them. Chances are that the number of LBA's on the new drive is less than the number of LBA's on the old drive. Solaris won't like that since when the old drive was configured Solaris used the full available capacity.

You need a drive with the same or greater number of LBAs which will be the number that Solaris is interested in. The new drive can be the same number of LBAs as the old drive or any number greater but NOT a single LBA smaller.

Hope that helps.
What's prtvtoc show for the working drive in the mirror?
# 5  
Old 12-18-2014
The OP provided the output from prtvtoc for both the new disk and an existing disk in their initial post. If you carefully examine the new disk geometry you will see that it is totally different from that of the existing disk.
# 6  
Old 12-18-2014
Quote:
Originally Posted by fpmurphy
The OP provided the output from prtvtoc for both the new disk and an existing disk in their initial post. If you carefully examine the new disk geometry you will see that it is totally different from that of the existing disk.
Yep. Missed that. Doh!

Lesson learned: not all 300gb hard drives are created equal.

And FWIW - this type of mistake is one of the reasons enterprise-level hardware support exists. How much did this "Ooops!" cost the OP's employer? I doubt the "too small" drive came via Oracle, HP, or IBM support.
# 7  
Old 12-18-2014
I wouldn't say totally different. The CHS geometry is essentially irrelevant with modern disks. What really matters are the disk sizes and the difference is about 0,01% (24 MB vs 300 GB).

May be the OS is too old / unpatched. Since a 2010 update, ZFS is able to adjust most of such cases.
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