welcome: please sign in

The following 175 words could not be found in the dictionary of 7 words (including 7 LocalSpellingWords) and are highlighted below:
about   acquire   add   Adding   Administration   agree   Alternatively   an   and   appropriate   are   array   at   attempt   bay   be   because   blank   block   both   boundaries   but   Category   caution   com   complain   complicated   count   counts   cylinder   design   destroy   Determine   dev   device   did   disk   disks   do   drive   dry   Ds   dump   dying   each   easy   ending   enter   entire   examples   fail   failed   familiar   find   first   fix   for   force   four   fritz   from   good   had   harmless   hotswap   http   identical   if   If   in   In   information   insert   Inserting   install   intended   is   just   least   leave   life   living   luck   lvm   main   managed   may   md   md0   md1   md2   mdadm   mirror   names   need   new   new1   new2   new3   node   non   not   obvious   of   on   one   ones   onto   or   out   paritions   partition   partitioned   Partitioning   partitions   Proceed   production   pry   raid   re   remove   replacement   Replacing   rest   rootfs   run   running   same   screws   sd   sda1   sfdisk   simplify   since   sled   so   software   somewhat   step   straightforward   Substitute   swap   System   target   that   the   then   there   things   This   time   to   To   top   total   true   Use   use   using   verification   want   warning   We   we   weren   when   will   with   wrong   www   Xbyte   xbyte   You   you   your  

Clear message
Edit

FritzHotSwapDrive

Replacing a drive in fritz's main array is somewhat complicated since we're using software raid on top of partitioned disks.

To simplify things, attempt to acquire identical disks, or at least ones with the same block counts. We had good luck with Xbyte when the first drive failed in production. This is true for both RAIDs.

Inserting the disks is straightforward: if using a new bay, just pry out the drive blank and insert the drive. If the drive is not in a hotswap sled, there are four screws and the rest is obvious from the design of the sled.

1. md2 (AFS)

This is easy since we're using md on top of the entire disk: mdadm --fail /dev/md2 $FAILED-DRIVE, remove the drive, insert the replacement, and mdadm /dev/md2 --add $NEW-DRIVE to insert the new drive.

Alternatively, leave the failed drive in, add the new drive to the array, and then fail the dying drive.

2. md0 and md1 (/ and swap)

This array is complicated, because we weren't so familiar with software raid and lvm at install time, and partitioned the disk, running an array on each partition.

In the examples, we will use $CURRENT for the non-failed drive in the array, $FAILED for the failed drive, and $NEW for the new drive. Substitute with the appropriate /dev/sdX.

2.1. Partitioning

If you managed to find a drive with the same block count, your life is easy. Determine the /dev/sdX names of each disk.

To dump information on the total block count of the drive for verification, run sfdisk -s $DISK on the living drive and the new drive.

If the block counts agree, there's one step: sfdisk -d $CURRENT | sfdisk --force $NEW. sfdisk may complain about paritions not ending on cylinder boundaries, but the warning is harmless. You may want to use sfdisk -n to do a dry run. If you enter the wrong device node you will destroy the target disk. Proceed with caution!

2.2. Adding to RAID

Use mdadm /dev/$array --add $newN to add partitions $new3 to md1 (rootfs), $new2 to md0 (swap). $new1 is intended to be a mirror of sda1, but we did not install md onto the device and need to fix that.

CategorySystemAdministration

FritzHotSwapDrive (last edited 2012-12-15 07:38:46 by ClintonEbadi)