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Disc failure during expansion
Hi all. I have been running a ReadyNAS with 3 drives in for a while, (2+2+4 Gig respectively). I ended up with 3.6TB of capacity, and hit 80%+ full the other day. Accordingly, I put an 8Gig dr...
robinwatts wrote:
If I had an array with 4+8+8, could I safely add another 4TB drive later to get it to the maximum 16?
The usual guidance is that you can only add 8 TB (or bigger). Taking the expansion limits into account, that means upgrading the 4 TB to 8 TB.
Some experiments posted here show that OS-6 NAS would let you add a 4 TB (since there is a 4 TB already in the array). However, I don't know if OS 5 will allow that (though it is technically possible).
Under the covers, a 4+8+8 setup has two RAID groups - a 3x4TB RAID-5 group that covers all drives, and a 2x4 RAID-1 group that covers the two larger drives. These are assembled into one volume.
Adding a 2 TB drive requires that the 3x4TB group be split into two 3x2TB groups (followed by adding the new drive to one of those groups). XRAID won't split an existing group that way (and I don't think it can be done easily w/o data loss).
robinwatts wrote:
I just want to be clear though - if I just power the array down, insert that new drive and power it back up, that'll give me the optimum setup?
You should be able to hot-insert the new drive into the failed drives slot. No need to power down, and there should be no need for a factory reset.
It is a good idea to back up the data though, just in case. RAID is a good thing, but it's not enough to keep your data safe (even when the array isn't degraded).
StephenB wrote:
robinwatts wrote:
I just want to be clear though - if I just power the array down, insert that new drive and power it back up, that'll give me the optimum setup?
You should be able to hot-insert the new drive into the failed drives slot. No need to power down, and there should be no need for a factory reset.
OK, so what I feared would happen has happened.
I now have a NAS containing 2+4+8+8 TB of drives, telling me that 552.7GB of 3.6TB is free. My data is intact, but I'm getting a fraction of the storage I should. I've tried rebooting the NAS, but it never reshapes.
Please, what do I have to do to get the array to reshape?
Thanks,
Robin
P.S. Can anyone explain why I have md0, md1 and md2 setup please? Is this to be expected?
root@ReadyNAS:~# cat /proc/mdstat
Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4]
md2 : active raid5 sda3[0] sdd3[3] sdc3[2] sdb3[4]
5846378112 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md1 : active raid1 sdd2[3] sda2[0] sdc2[2] sdb2[4]
524276 blocks super 1.2 [4/4] [UUUU]
md0 : active raid1 sda1[0] sdc1[2]
4193268 blocks super 1.2 [2/2] [UU]
unused devices: <none>
root@ReadyNAS:~# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Fri Oct 26 01:53:00 2012
Raid Level : raid1
Array Size : 4193268 (4.00 GiB 4.29 GB)
Used Dev Size : 4193268 (4.00 GiB 4.29 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Wed Jul 5 00:04:20 2017
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Name : 2CB05DBEAB2F:0
UUID : 34f72ac9:d360ca89:92f12084:939c7684
Events : 17017846
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
2 8 33 1 active sync /dev/sdc1
root@ReadyNAS:~# mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Fri Oct 26 01:53:00 2012
Raid Level : raid1
Array Size : 524276 (512.07 MiB 536.86 MB)
Used Dev Size : 524276 (512.07 MiB 536.86 MB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Jul 5 00:01:44 2017
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Name : 2CB05DBEAB2F:1
UUID : 25472b3c:d3eaa178:89abf435:cce05bcf
Events : 287603
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
4 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
3 8 50 3 active sync /dev/sdd2
root@ReadyNAS:~# mdadm --detail /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Fri Oct 26 01:53:00 2012
Raid Level : raid5
Array Size : 5846378112 (5575.54 GiB 5986.69 GB)
Used Dev Size : 1948792704 (1858.51 GiB 1995.56 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Wed Jul 5 00:03:30 2017
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : 2CB05DBEAB2F:2
UUID : 237489f5:979f54be:b8d03e30:5717158c
Events : 23424
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
4 8 19 1 active sync /dev/sdb3
2 8 35 2 active sync /dev/sdc3
3 8 51 3 active sync /dev/sdd3
md0 and md1 are for the OS parition on the disks, so they are normally there.
md0 should be RAID-1 and include all disks installed in the system.
md1 is RAID-6 on my x86 NAS and also includes all disks installed in the system. Not sure why your is showing up as RAID-1.
Normally you'd see bigger numbers for the data volume md126, md127 - not md2.
Are you sure you have XRAID turned on (green stripe showing on the XRAID control in the volume tab)?
StephenB wrote:md0 and md1 are for the OS parition on the disks, so they are normally there.
md0 should be RAID-1 and include all disks installed in the system.
md1 is RAID-6 on my x86 NAS and also includes all disks installed in the system. Not sure why your is showing up as RAID-1.
Normally you'd see bigger numbers for the data volume md126, md127 - not md2.
Are you sure you have XRAID turned on (green stripe showing on the XRAID control in the volume tab)?
I am not sure I can turn it off!
On the admin/index.html page, I have:
Hardware Model: ReadyNAS NV+ v2
Serial: [omitted here]
Firmware: RAIDiator 5.3.13
Memory: 256MB
Device Time: July 5, ....
RAID Type: X-RAID2
Services
Network
Volumes /c
X-RAID2 (Redundant)
553.7 GB Free of 3.6TB
[============== ]
Opps, you are correct. Somehow I was thinking OS6.
Did you try rebooting?
Also, with OS 5 there is an expansion ceiling - the array can't grow more than 8 TiB from it's starting point. You will run into that anyway. The simplest thing is to do a factory reset, but it is possible (with some risk) to dismount the data volume and expand it off-line with linux shell commands.
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