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- <h1>Sat, 12 Jul 2008</h1>
- <div class="entry"><h2>Rebuilding a RAID array</h2><div><p>I recently had a failed drive in my RAID1 array. I've just installed
-the replacement drive and thought I'd share the method.</p><p>Let's look at the current situation:</p><pre>
-root@ace:~# <b>cat /proc/mdstat</b>
-Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
-md1 : active raid1 sda3[1]
- 483403776 blocks [2/1] [_U]
-
-md0 : active raid1 sda1[1]
- 96256 blocks [2/1] [_U]
-
-unused devices: &lt;none&gt;
-</pre><p>So we can see we have two mirrored arrays with one drive missing in both.</p><p>Let's see that we've recognised the second drive:</p><pre>
-root@ace:~# <b>dmesg | grep sd</b>
-[ 21.465395] Driver 'sd' needs updating - please use bus_type methods
-[ 21.465486] sd 2:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
-[ 21.465496] sd 2:0:0:0: [sda] Write Protect is off
-[ 21.465498] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
-[ 21.465512] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 21.465562] sd 2:0:0:0: [sda] 976773168 512-byte hardware sectors (500108 MB)
-[ 21.465571] sd 2:0:0:0: [sda] Write Protect is off
-[ 21.465573] sd 2:0:0:0: [sda] Mode Sense: 00 3a 00 00
-[ 21.465587] sd 2:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 21.465590] sda: sda1 sda2 sda3
-[ 21.487248] sd 2:0:0:0: [sda] Attached SCSI disk
-[ 21.487303] sd 2:0:1:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
-[ 21.487314] sd 2:0:1:0: [sdb] Write Protect is off
-[ 21.487317] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
-[ 21.487331] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 21.487371] sd 2:0:1:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
-[ 21.487381] sd 2:0:1:0: [sdb] Write Protect is off
-[ 21.487382] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
-[ 21.487403] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 21.487407] sdb: unknown partition table
-[ 21.502763] sd 2:0:1:0: [sdb] Attached SCSI disk
-[ 21.506690] sd 2:0:0:0: Attached scsi generic sg0 type 0
-[ 21.506711] sd 2:0:1:0: Attached scsi generic sg1 type 0
-[ 21.793835] md: bind&lt;sda1&gt;
-[ 21.858027] md: bind&lt;sda3&gt;
-</pre><p>So, sda has three partitions, sda1, sda2 and sda3, and sdb has no partition
-table. Let's give it one the same as sda. The easiest way to do this is using
-<tt>sfdisk</tt>:</p><pre>
-root@ace:~# <b>sfdisk -d /dev/sda | sfdisk /dev/sdb</b>
-Checking that no-one is using this disk right now ...
-OK
-
-Disk /dev/sdb: 60801 cylinders, 255 heads, 63 sectors/track
-
-sfdisk: ERROR: sector 0 does not have an MSDOS signature
- /dev/sdb: unrecognised partition table type
-Old situation:
-No partitions found
-New situation:
-Units = sectors of 512 bytes, counting from 0
-
- Device Boot Start End #sectors Id System
-/dev/sdb1 * 63 192779 192717 fd Linux RAID autodetect
-/dev/sdb2 192780 9960299 9767520 82 Linux swap / Solaris
-/dev/sdb3 9960300 976768064 966807765 fd Linux RAID autodetect
-/dev/sdb4 0 - 0 0 Empty
-Successfully wrote the new partition table
-
-Re-reading the partition table ...
-
-If you created or changed a DOS partition, /dev/foo7, say, then use dd(1)
-to zero the first 512 bytes: dd if=/dev/zero of=/dev/foo7 bs=512 count=1
-(See fdisk(8).)
-</pre><p>If we check <tt>dmesg</tt> now to check it's worked, we'll see:</p><pre>
-root@ace:~# <b>dmesg | grep sd</b>
-...
-[ 224.246102] sd 2:0:1:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
-[ 224.246322] sd 2:0:1:0: [sdb] Write Protect is off
-[ 224.246325] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
-[ 224.246547] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 224.246686] sdb: unknown partition table
-[ 227.326278] sd 2:0:1:0: [sdb] 976773168 512-byte hardware sectors (500108 MB)
-[ 227.326504] sd 2:0:1:0: [sdb] Write Protect is off
-[ 227.326507] sd 2:0:1:0: [sdb] Mode Sense: 00 3a 00 00
-[ 227.326703] sd 2:0:1:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
-[ 227.326708] sdb: sdb1 sdb2 sdb3
-</pre><p>So, now we have identical partition tables. The next thing to do is to add the new partitions to the array:</p><pre>
-root@ace:~# <b>mdadm /dev/md0 --add /dev/sdb1</b>
-mdadm: added /dev/sdb1
-root@ace:~# <b>mdadm /dev/md1 --add /dev/sdb3</b>
-mdadm: added /dev/sdb3
-</pre><p>Everything looks good. Let's check <tt>dmesg</tt>:</p><pre>
-[ 323.941542] md: bind&lt;sdb1&gt;
-[ 324.038183] RAID1 conf printout:
-[ 324.038189] --- wd:1 rd:2
-[ 324.038192] disk 0, wo:1, o:1, dev:sdb1
-[ 324.038195] disk 1, wo:0, o:1, dev:sda1
-[ 324.038300] md: recovery of RAID array md0
-[ 324.038303] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
-[ 324.038305] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
-[ 324.038310] md: using 128k window, over a total of 96256 blocks.
-[ 325.417219] md: md0: recovery done.
-[ 325.453629] RAID1 conf printout:
-[ 325.453632] --- wd:2 rd:2
-[ 325.453634] disk 0, wo:0, o:1, dev:sdb1
-[ 325.453636] disk 1, wo:0, o:1, dev:sda1
-[ 347.970105] md: bind&lt;sdb3&gt;
-[ 348.004566] RAID1 conf printout:
-[ 348.004571] --- wd:1 rd:2
-[ 348.004573] disk 0, wo:1, o:1, dev:sdb3
-[ 348.004574] disk 1, wo:0, o:1, dev:sda3
-[ 348.004657] md: recovery of RAID array md1
-[ 348.004659] md: minimum _guaranteed_ speed: 1000 KB/sec/disk.
-[ 348.004660] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery.
-[ 348.004664] md: using 128k window, over a total of 483403776 blocks.
-</pre><p>Everything still looks good. Let's sit back and watch it rebuild using the wonderfully useful <tt>watch</tt> command:</p><pre>
-root@ace:~# <b>watch -n 1 cat /proc/mdstat</b>
-Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
-md1 : active raid1 sdb3[2] sda3[1]
- 483403776 blocks [2/1] [_U]
- [=====&gt;...............] recovery = 26.0% (126080960/483403776) finish=96.2min speed=61846K/sec
-
-md0 : active raid1 sdb1[0] sda1[1]
- 96256 blocks [2/2] [UU]
-
-unused devices: &lt;none&gt;
-</pre><p>The Ubuntu and Debian installers will allow you create RAID1 arrays
-with less drives than you actually have, so you can use this technique
-if you plan to add an additional drive after you've installed the
-system. Just tell it the eventual number of drives, but only select the
-available partitions during RAID setup. I used this method when a new machine recent
-didn't have enough SATA power cables and had to wait for an adaptor to
-be delivered.</p><p><small>(Why did no one tell me about <tt>watch</tt> until recently. I wonder
-how many more incredibly useful programs I've not discovered even after 10
-years of using Linux</small>)</p></div>
- [<a href="http://www.davidpashley.com/blog/tags/linux" rel="tag">linux</a>, <a href="http://www.davidpashley.com/blog/tags/mdadm" rel="tag">mdadm</a>, <a href="http://www.davidpashley.com/blog/tags/RAID" rel="tag">RAID</a>] | <a href="http://www.davidpashley.com/blog/linux/rebuilding-raid" title="Permalink"># Read Comments (3)</a> |
- <div class="archives"><div id="relatedstories"><h2>Related Stories</h2><p><a href="http://www.davidpashley.com/blog/linux/copying-files-with-netcat">Copying files with netcat</a><br /><a href="http://www.davidpashley.com/blog/computing/network-troubleshooting">Network Troubleshooting Article</a><br /></p></div></div>
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- <h2>Comments</h2>
- <div class="blosxomComments">
- <div class="blosxomComment"><!-- Rebuilding a RAID array --><a name="1215931866.99" id="1215931866.99"></a>
- One extra step that I do is install an MBR on the new disk, to make it bootable:<br />
-<br />
-install-mbr /dev/sdb<br />
- Posted by <a href="http://gedmin.as">Marius Gedminas</a> at Sun Jul 13 07:51:06 2008
- </div>
- <div class="blosxomComment"><!-- Rebuilding a RAID array --><a name="1215971647.83" id="1215971647.83"></a>
- Great article!<br />
-Maybe it would be even more useful if merged here:<br />
-<a href="http://linux-raid.osdl.org/index.php/Reconstruction">http://linux-raid.osdl.org/index.php/Reconstruction</a><br />
- Posted by <a href="http://edpeur.blogspot.com/">Eduardo Pérez Ureta</a> at Sun Jul 13 18:54:07 2008
- </div>
- <div class="blosxomComment"><!-- Rebuilding a RAID array --><a name="1216035050.47" id="1216035050.47"></a>
- Semi-Tangential note about performance:  On my home (== partly "play") machine, I made the experience that "mdadm --manage .. --fail"-ing the root partition before doing lots of package upgrades (installing KDE 4/experimental and lots of other updates in my case, on a mostly etch system.  Dual screen support sucks if the screens don't have the same size, btw!) speeds up apt considerably, while the subsequent reconstruct step (--remove and then --add the partition) doesn't slow down the system much during light desktop workload.<br />
-<br />
-My system is a few years old (no SATA, probably not too much cache on the disks, too) and has only 512M RAM, so maybe a better equipped system would make this less noticeable.<br />
-<br />
-(... and no, I probably wouldn't force-fail part of my /home partition for any length of time :-)<br />
- Posted by <a href="http://fortytwo.ch/">cmot</a> at Mon Jul 14 12:30:50 2008
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