Won't go away
It's my understanding, that an array running with [UU_] is degraded and there is a disk problem.
I have been trying to create a RAID array using this command:
mdadm --create --verbose /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1
However, once it create it, it get this in /proc/mdstat:
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]
3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2]
[UU_]
[>....................] recovery = 0.1% (2611780/1953382400)
finish=1737.7min speed=18709K/sec
bitmap: 0/15 pages [0KB], 65536KB chunkI have done the following to "fix" the drive:
1. Smartmontools smartctl long and short tests. All passed.
2. Zeroed the first 1GB of the drive (overkill, I know I could just do the first 512) with dd if=/dev/zero of=/dev/sdb count=250000 bs=4k
3. Re-partitioned the drive.
4. Re-create.
No joy.
Then, I swapped this hard drive out for another drive.
I am still getting [UU_].
Thoughts?
Signature · 14 lines
Michael Munger, dCAP, MCPS, MCNPS, MBSS High Powered Help, Inc. Microsoft Certified Professional Microsoft Certified Small Business Specialist Digium Certified Asterisk Professional [email protected] -- Michael Munger, dCAP, MCPS, MCNPS, MBSS High Powered Help, Inc. Microsoft Certified Professional Microsoft Certified Small Business Specialist Digium Certified Asterisk Professional [email protected]
Quoted 10 lines · Michael Munger
It's my understanding, that an array running with [
UU_] is degraded and there is a disk problem.I have been trying to create a RAID array using this command:
mdadm --create --verbose
/dev/md0--level=5 --raid-devices=3/dev/sdb1/dev/sdc1/dev/sdd1However, once it create it, it get this in
/proc/mdstat:
Quoted 7 lines
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_] [>....................] recovery = 0.1% (2611780/1953382400) finish=1737.7min speed=18709K/sec bitmap: 0/15 pages [0KB], 65536KB chunk
What's to fix? Did you try waiting for the recovery to finish? Creating an array generally isn't instant -- the redundancy has to be computed over the entire array.
Now, you might have speed limits that are making it slower than possible (see man md), but multiple hours on big devices is perfectly normal.
Phil
A message that is not in the archive (sent off-list or not yet received): [email protected]
Hi Michael,
{Added the list back and fixed the top-posting. Convention on kernel.org is to reply-to-all, trim replies, and bottom post or interleave.}
Quoted 15 lines · Michael Munger
Quoted 14 lines · Phil Turmel
Quoted 7 lines · Michael Munger
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_] [>....................] recovery = 0.1% (2611780/1953382400) finish=1737.7min speed=18709K/sec bitmap: 0/15 pages [0KB], 65536KB chunkWhat's to fix? Did you try waiting for the recovery to finish? Creating an array generally isn't instant -- the redundancy has to be computed over the entire array.
Quoted 5 lines
Quoted 2 lines
Now, you might have speed limits that are making it slower than possible (see man md), but multiple hours on big devices is perfectly normal.
I thought [
UU_] indicated a physical drive problem, not logical array issue. I'll wait until 2pm when this is supposed to finish and re-check.
I mentioned the speed limits because 20MB/sec is kinda low for modern drives. You can probably speed that up.
Quoted 3 lines
It will be GREAT if that's all it was... my being impatient!
PS... lsdrv is a great utility. thanks for making it available on Github.
You're welcome :-)
Phil
Quoted 26 lines · Michael Munger
It's my understanding, that an array running with [
UU_] is degraded and there is a disk problem.I have been trying to create a RAID array using this command:
mdadm --create --verbose
/dev/md0--level=5 --raid-devices=3/dev/sdb1/dev/sdc1/dev/sdd1However, once it create it, it get this in
/proc/mdstat:Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]3906764800 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_] [>....................] recovery = 0.1% (2611780/1953382400) finish=1737.7min speed=18709K/sec bitmap: 0/15 pages [0KB], 65536KB chunkI have done the following to "fix" the drive:
1. Smartmontools smartctl long and short tests. All passed.
2. Zeroed the first 1GB of the drive (overkill, I know I could just do the first 512) with dd if=/dev/zero of=/dev/sdb count=250000 bs=4k
3. Re-partitioned the drive.
4. Re-create.
Quoted 7 lines
No joy.
Then, I swapped this hard drive out for another drive.
I am still getting [
UU_].Thoughts?
This is perfectly normal. A RAID-5 array is created in degraded mode, then the final disk is synchronised. This makes the array available immediately, with the synchonisation happening in the background.
Just leave it to complete the recovery process.
Cheers,
Robin
Signature · 4 lines
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