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Testing RAID by pulling a drive

If one drive is pulled, the software RAID at this point adds the hot-spare and starts rebuilding the RAID (this will take a few hours). Your environment will still be up, but some resources will be taken to assist in the rebuilding process. 

NOTE:

There are no current monitoring alerts for RAID health status (although, we are working to get this implemented in a future feature).

Also, if a drive fails, adding a new drive to the RAID is not automatic and requires support interaction. 

 

Example before pulling the drive:

[From storage]# cat /proc/mdstat

Personalities : [raid6] [raid5] [raid4] [raid0]

md50 : active raid0 md124[0] md126[1] md125[2] md127[3]

44989628416 blocks super 1.2 512k chunks

 

md124 : active raid5 dm-9[6] dm-0[2] dm-4[7] dm-7[3] dm-3[4] dm-1[5] dm-6[1]

11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]

bitmap: 2/14 pages [8KB], 65536KB chunk

 

md125 : active raid5 dm-15[0] dm-17[1] dm-19[6] dm-24[2] dm-18[3] dm-23[7](S) dm-20[5] dm-16[4]

11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]

bitmap: 1/14 pages [4KB], 65536KB chunk

 

md126 : active raid5 dm-10[0] dm-22[7](S) dm-13[1] dm-12[6] dm-8[4] dm-5[2] dm-14[5] dm-11[3]

11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]

bitmap: 2/14 pages [8KB], 65536KB chunk

 

md127 : active raid5 dm-26[0] dm-30[7](S) dm-31[6] dm-27[5] dm-29[4] dm-28[3] dm-25[2] dm-21[1]

11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]

bitmap: 1/14 pages [4KB], 65536KB chunk

 

unused devices: <none>

 

Console warning when the drive is removed: 

[From storage]# WARNING: Your hard drive is failing

Device: /dev/bus/11 [megaraid_disk_01], failed to read SMART values

 

Status after pulling the drive (shows rebuild progress and estimated time to finish):

 [From Storage]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] [raid0]
md50 : active raid0 md124[0] md126[1] md125[2] md127[3]
44989628416 blocks super 1.2 512k chunks
 
md124 : active raid5 dm-9[6] dm-0[2] dm-4[7] dm-7[3] dm-3[4] dm-1[5] dm-6[1]
11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]
bitmap: 1/14 pages [4KB], 65536KB chunk
 
md125 : active raid5 dm-15[0] dm-17[1](F) dm-19[6] dm-24[2] dm-18[3] dm-23[7] dm-20[5] dm-16[4]
11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/6] [U_UUUUU]
[>....................]  recovery =  0.9% (18209920/1874589696) finish=154.5min speed=200195K/sec
bitmap: 2/14 pages [8KB], 65536KB chunk
 
md126 : active raid5 dm-10[0] dm-22[7](S) dm-13[1] dm-12[6] dm-8[4] dm-5[2] dm-14[5] dm-11[3]
11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]
bitmap: 2/14 pages [8KB], 65536KB chunk
 
md127 : active raid5 dm-26[0] dm-30[7](S) dm-31[6] dm-27[5] dm-29[4] dm-28[3] dm-25[2] dm-21[1]
11247538176 blocks super 1.2 level 5, 16k chunk, algorithm 2 [7/7] [UUUUUUU]
bitmap: 1/14 pages [4KB], 65536KB chunk
 
unused devices: <none>

 

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