Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [degraded]

Degraded refers to a fallback mode that continues to allow the usage of the storage array, but at a lower performance level.

When a RAID array experiences the failure of one or more disks, it can enter degraded mode, a fallback mode that generally allows the continued usage of the array, but either loses the performance boosts of the RAID technique or experiences severe performance penalties due to the necessity to reconstruct the damaged data from error correction data.

31 questions
10
votes
4 answers

How to resolve virtual disk degraded in Windows Server 2012

I am using the new Storage Spaces feature in Windows Server 2012. I have the following disks: FriendlyName CanPool OperationalStatus HealthStatus Usage Size ------------ ------- …
nietras
  • 151
  • 1
  • 1
  • 7
10
votes
5 answers

Boot Debian while RAID array is degraded

Recently, I came across Ubuntu Server install. During install, it asked me whether or not to allow booting system from degraded RAID array (probably because I installed system onto RAID1 /dev/md0 device). This is mighty-useful option for unattended…
mr.b
  • 583
  • 10
  • 25
6
votes
1 answer

How to auto-start Degraded Software RAID1 under Debian 8.0.0 on boot?

If you remove a component HDD from an array, it drops into a "busy box" shell under "(initramfs)" saying something similar to "cannot mount root device" as the RAID1 array becomes "inactive". It is possible to start it using: (initramfs): mdadm…
Bob
  • 81
  • 1
  • 6
5
votes
1 answer

what harm can writeback caching have on a degraded disk array?

At work I administer several machines using (real) hardware raid controllers (with battery backed write caches), and these have the nasty habit of falling back to writethrough behaviour when an array becomes degraded due to a disk failure. I cannot…
jap
  • 173
  • 5
5
votes
2 answers

NAS device claims drive in a RAID is degraded but S.M.A.R.T. says it is fine

I have a Synology DS213 with two 600GB drives in RAID 1. Last night the device reported that my second drive had become degraded and that I should replace it. When I ran a extensive S.M.A.R.T. test the results said that the drive is okay. How can I…
Nathan Villaescusa
  • 151
  • 1
  • 4
5
votes
4 answers

Ubuntu raid - replacing drive?

I've set up software RAID1 with the latest Ubuntu version - 11.04 using two 250GB harddrives which initially worked great. Tried to unplug both and computer still started with degraded raid status - reconnecting and rebooting makes the resync…
Industrial
  • 1,559
  • 5
  • 24
  • 37
4
votes
1 answer

DEGRADED zfs pool vs FAULTED

My backup NAS (Arch-based) reports a degraded pool. It also report a degraded disk as "repairing". I'm confused by this. Presuming that faulted is worse that degraded, should I be worried? zpool status -v: pool: zdata state: DEGRADED status: One…
theking2
  • 159
  • 1
  • 8
4
votes
2 answers

Raid 5 Recovery Process

I just recently setup a 3 drive 4TB MDRAID 5 array for mirroring and an online backup of our server. I am preparing for a future hardware (drive) failure and wanted to mitigate a recovery failure from a URE. Typically I think of the process for…
Damon
  • 429
  • 2
  • 11
4
votes
0 answers

Rebooted Ubuntu, Raid6 degraded, Raid5 ok

Boot Drive is a WD 1TB SSD running Ubuntu 18.04 LTS... I have 2 arrays running off 1 LSI Card... 16 x 8tb IronWolf inside a RaidMachine (Raid 6) [my main data] 11 x 10tb Exos inside a SuperMicro (Raid 5) [backups] Everything was fine, and has been…
PerryCS
  • 141
  • 3
2
votes
3 answers

Two drive ZFS pool, second drive overwritten with data. How do I restore/copy data back to the second drive?

Data is intact in the first drive, second drive is "UNAVAIL". Reason for overwrite is my lack of concentration while applying dd command ... Command sudo zpool replace -f hgst 4596995095197485503 /dev/sdd Gives invalid vdev specification the…
Ohto Nordberg
  • 141
  • 6
2
votes
1 answer

How to create degraded raid6 array using megacli

There is a server with few disks. And - a new server with PERC controller. I would like to migrate existing data into a new server to raid6 which uses 6 disks(4+2). Unfortunly - i don't have enought free disks to create a "target" raid6 array. I…
undefine
  • 956
  • 8
  • 20
2
votes
1 answer

Ganeti disks degraded drbd cs:NetworkFailure

I have an instance (with 2disks) on Ganeti with both disks degraded (probably due to a connection problem?). This instance was working correctly for many years until this morning. On my master $ gnt-instance info myinstance ... -disk/0 on…
dalf
  • 153
  • 6
2
votes
3 answers

P4500 Lefthand SAN report degraded on one node when all disks are health "NORMAL"

I am experiencing a strange condition with our HP G1 lefthand SAN cluster. The cluster consists of 4 nodes across two sites, two nodes ( node 1 & 2 )in each site are RAID5 across the pair, and these are mirrored into our DR site (Node 3 & 4 ). Node…
FIASITManager
  • 21
  • 1
2
votes
1 answer

Virtual Disk Degraded

There is a physical DC with a Raid 1 Mirror, 2 Physical Disks, 500GB each. Dell Server Administrator is installed on the DC, and is reporting both physical disks are fine, online, in a good state etc. On a PERC S300 Raid Controller: Physical Disk…
PnP
  • 1,684
  • 8
  • 37
  • 65
2
votes
2 answers

Raid1 degraded after every reboot

After setup, cat /proc/mdstat output looks like this: proxmox:~# cat /proc/mdstat Personalities : [linear] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md0 : active raid1 sdc2[1] sdb2[0] 293024832 blocks [2/2] [UU] unused devices:…
Sparctus
  • 29
  • 1
  • 2
  • 5
1
2 3