Raid 5 State: clean, degraded

Detail:

Zitat

Version : 1.2
Creation Time : Tue Mar 27 21:13:58 2012
Raid Level : raid5
Array Size : 3907025920 (3726.03 GiB 4000.79 GB)
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Sun Oct 21 10:05:13 2012
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Name : openmediavault:data (local to host openmediavault)
UUID : 643b3a43:837bcccc:5e10eb1b:66015df0
Events : 29786

Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
1 8 32 1 active sync /dev/sdc
2 0 0 2 removed

Alles anzeigen

How would a read this and determine this issue

Thanks

Drew

Whats odd is I shutdown and made sure all HDDs were plugged in properly into my HP N40.

upon reboot i saw it state that 2 of 3 devices were active.

Also now its showing differing devices active:

Zitat

Version : 1.2
Creation Time : Tue Mar 27 21:13:58 2012
Raid Level : raid5
Array Size : 3907025920 (3726.03 GiB 4000.79 GB)
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 3
Total Devices : 2
Persistence : Superblock is persistent

Update Time : Sun Oct 21 10:33:03 2012
State : clean, degraded
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Layout : left-symmetric
Chunk Size : 512K

Name : openmediavault:data (local to host openmediavault)
UUID : 643b3a43:837bcccc:5e10eb1b:66015df0
Events : 30136

Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 0 0 2 removed

Alles anzeigen

While in Physical Disks, it shows all the devices there

Any help would be wonderful

Drew

Seeing as how /sdc was "removed" however there was no mention of it failing
in command i typed:

mdadm --add /dev/md127 /dev/sdc

So the device has been readded and is recovering:

oot@openmediavault:~# mdadm --add /dev/md127 /dev/sdc
mdadm: re-added /dev/sdc
root@openmediavault:~# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4] 
md127 : active raid5 sdc[2] sda[0] sdb[1]
      3907025920 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
      [>....................]  recovery =  0.0% (76800/1953512960) finish=115215.8min speed=282K/sec

First thought is the recovery is going to take 80 days...
second is how do i determine why the device was removed and how to test it to make sure it it not failing

Thank you

Drew

root@openmediavault:~# sudo hdparm -tT /dev/sda


/dev/sda:
 Timing cached reads:   2296 MB in  2.00 seconds = 1148.09 MB/sec
 Timing buffered disk reads: 316 MB in  3.10 seconds = 101.80 MB/sec
root@openmediavault:~# sudo hdparm -tT /dev/sdb


/dev/sdb:
 Timing cached reads:   2312 MB in  2.00 seconds = 1155.92 MB/sec
 Timing buffered disk reads: 350 MB in  3.01 seconds = 116.26 MB/sec
root@openmediavault:~# sudo hdparm -tT /dev/sdc


/dev/sdc:
 Timing cached reads:     2 MB in  3.54 seconds = 578.58 kB/sec
 Timing buffered disk reads:   2 MB in  7.59 seconds = 269.92 kB/sec

More information.
/dev/sdc has an insanely slower read times. Is this due to the rebuilding or is something faulty?

I see some people referring to cables going bad, however on the HP N40 Micro server im not sure replacing one is possiable

any help would be great!

Drew

Zitat von "ryecoaaron"

Is there anything in the system logs? Looks like the drive is failing and that is why it is rebuilding so slow. I may be wrong on this one but to check the cable, just swap with one of the other raid drives. mdadm should still be able find the drive even though it moved to the new location.

Seeing that you have a N40l you might know this. However is it possible to switch cabling? i was under the impression it was all one master cable

Thanks

Drew

I just took apart the HP N40L and the swappable trays are connected to a back plate and each SATA plug is connected to a HP specific cable bundle, pretty much impossible to switch without order a new entire proprietary SATA cable bundle. However i was able to switch the one drive in question into an open slot and reboot and continue tests.

root@openmediavault:~# sudo hdparm -tT /dev/sdd


/dev/sdd:
 Timing cached reads:     2 MB in  8.13 seconds = 251.84 kB/sec
 Timing buffered disk reads:   2 MB in  9.74 seconds = 210.16 kB/sec
root@openmediavault:~# sudo hdparm -tT /dev/sdc


/dev/sdc:
 Timing cached reads:   2224 MB in  2.00 seconds = 1111.71 MB/sec
 Timing buffered disk reads: 338 MB in  3.00 seconds = 112.62 MB/sec
root@openmediavault:~# sudo hdparm -tT /dev/sdb


/dev/sdb:
 Timing cached reads:   2298 MB in  2.00 seconds = 1148.53 MB/sec
 Timing buffered disk reads: 322 MB in  3.00 seconds = 107.21 MB/sec

It appears that im still getting dismally slow read times on the save drive in a new SATA slot.
With still slow recovery:

Personalities : [raid6] [raid5] [raid4] 
md127 : active raid5 sdb[0] sdd[2] sdc[1]
      3907025920 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
      [>....................]  recovery =  0.8% (16379688/1953512960) finish=100451.7min speed=321K/sec

unused devices: <none>

It does bounce up to say 1600K/ sec but not too much over that.

SMART still shows the drive good, however it is odd that the drive became removed from the raid to begin with..
still lost here

Drew