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RN104 degraded volume resyncing - Less than 10% of volume data's capacity is free
Hi, I have a RN104 (with 4 discs : 4TB, 3TB, 4TB, 3TB (this one has a yellow light), firmware: 6.9.3). The status is "degraded, volume resyncing". The log states "Volume: Less than 10% of volume data's capacity is free. Performance on volume data is degraded. To improve performance, you must add capacity." What means "degraded" and which discs do I replace first. the 2 3TBs? Do I have to wait till the resync process is finished? Do I need to worry and should I make a backup?
I greatly appreciate any help! Many thanks in advance.
Isa28 wrote:(1) first to backup the data to another NAS after the sync has finished
(2) then replace both 3TB discs with larger discs (I am thinking of 6TB)
What will happen then?
First, confirm that you are in XRAID mode - there should be a green stripe on the XRAID control on the volume tab.
After the backup, you hot-insert the first new drive (removing and replacing the disk with the NAS running). The NAS will detect the new drive, and resync. The resync is reconstructing the 3 TB of data that was on the old disk from the remaining ones. It will then expand your volume by 1 TB (from 10 TB to 11 TB).
Note these sizes are in "classic" TB (1000*1000*1000*1000 bytes). The NAS (like windows) uses TiB (1024*1024*1024*1024 bytes), but uses TB as the label. 10 TB is about 9.09 TiB; 11 TB is about 10 TiB.
When the resync completes successfully, you hot-insert the second drive in the same way. The NAS will resync again - reconstructing the 3 TB of data that was on the original second drive from the others.
When that second step completes, the NAS will automatically expand the volume by 3 TB from 11 TB to 14 TB (~12.7 TiB ). This might happen in two steps (11-12, and then 12-14).
The system might prompt you to reboot the NAS before it expands the volume- either after the first resync or the second.
Since you have a backup NAS, you could alternatively switch to that after the backup, and do a clean factory install (either from the boot menu or the web UI). Then reconfigure the NAS and restore the data from the backup NAS. The disadvantage is that your data won't be available until after you restore it - so you'd need to use the backup NAS as primary while that's being done. But if you have a gigabit network it could finish a little faster, since creating a volume from scratch takes about the same time as a single resync (and you need to do two). It also gives you a completely clean file system.
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Hi Isa28
Welcome to the Community!
" What means "degraded"
Degraded mode on a RAID array means that your volume performance is lessen due to a failure on one of your disks or if the drives are not in sync but you will still be able to access your data because of the protection of the RAID.
If the issue is regarding disk failure it is always recommended to replace the failing/failed disk immediately to avoid data loss.
"which discs do I replace first"
It is always recommended to replace the failing/failed disk immediately to avoid any other issues and data loss, in this case the 3TB with the yellow light warning. We would advise to replace it with another 4TB disk since you are also being warned of low volume capacity. If you plan to replace the disk with higher than 4TB we recommend replacing all drives with the same capacity to fully utilize it's size.
YES you have to wait for the re-sync to finish before inserting another disk or before replacing the 3TB disk.
Having a backup is always advised even if you don't have any issues or failures :). We recommend doing a backup while you still have access.
Hope this helps!
Regards
Isa28 wrote:
The status is "degraded, volume resyncing". The log states "Volume: Less than 10% of volume data's capacity is free. Performance on volume data is degraded. To improve performance, you must add capacity."
I want to add that these two messages aren't related. As Marc_V says, your volume is degraded because it is resyncing. It is also full, so you do need to add capacity.
Marc_V wrote:
If you plan to replace the disk with higher than 4TB we recommend replacing all drives with the same capacity to fully utilize it's size.
I disagree with Marc on this. If you replace two 3 TB drives with larger ones (say 6 TB), then you will fully utilize the size. You don't need to replace all four with the new size - but you do need to replace at least two. The capacity rule for volume capacity is "sum the disks and subtract the largest".
Replacing two 3 TB disks with 4 TB models would increase your capacity from 10 to 12 TB. It would cost about $250 (depending on disk choice of course) - or $125/TB gained. Expansion after that would require that you upgrade two 4 TB disks to a larger size.
Replacing them both with 6 TB would give you 14 TB, and cost about $390. Total cost is higher, and the cost per TB gained is cheaper ($97.50/TB gained). And expansion after that could be done by upgrading a single 4 TB drive to 6 TB.
This shows that when you are expanding vertically (replacing healthy drives with larger sizes), it is often more cost effective in the long run to go with larger sizes.
Since you are close to maxing out the storage now, I'd suggesting doing that - because it gives you more capacity now, and will make future expansion less expensive. If you want to use the plastic inserts in the trays, then consider WDC Reds - they still have the side center mounting hole that the inserts use. If you use Seagate Ironwolf (for example) you'd need to remove the inserts and use the screws that came with the NAS to mount the drives to the bottom of the trays.
Hi Marc and Stephen,
thank you both very much for those great explanations and advice!
To make sure that I do not loose data, as my last backup is a month ago, what would be the correct steps:
(1) first to backup the data to another NAS after the sync has finished(2) then replace both 3TB discs with larger discs (I am thinking of 6TB)
What will happen then? Will the remaining (4TB) discs write the data to the new discs or do I reformat all discs and play back the backup from the other NAS.
Sorry, if this sounds stupied, but I have not done this before.Many thanks again!
Isabelle
Isa28 wrote:(1) first to backup the data to another NAS after the sync has finished
(2) then replace both 3TB discs with larger discs (I am thinking of 6TB)
What will happen then?
First, confirm that you are in XRAID mode - there should be a green stripe on the XRAID control on the volume tab.
After the backup, you hot-insert the first new drive (removing and replacing the disk with the NAS running). The NAS will detect the new drive, and resync. The resync is reconstructing the 3 TB of data that was on the old disk from the remaining ones. It will then expand your volume by 1 TB (from 10 TB to 11 TB).
Note these sizes are in "classic" TB (1000*1000*1000*1000 bytes). The NAS (like windows) uses TiB (1024*1024*1024*1024 bytes), but uses TB as the label. 10 TB is about 9.09 TiB; 11 TB is about 10 TiB.
When the resync completes successfully, you hot-insert the second drive in the same way. The NAS will resync again - reconstructing the 3 TB of data that was on the original second drive from the others.
When that second step completes, the NAS will automatically expand the volume by 3 TB from 11 TB to 14 TB (~12.7 TiB ). This might happen in two steps (11-12, and then 12-14).
The system might prompt you to reboot the NAS before it expands the volume- either after the first resync or the second.
Since you have a backup NAS, you could alternatively switch to that after the backup, and do a clean factory install (either from the boot menu or the web UI). Then reconfigure the NAS and restore the data from the backup NAS. The disadvantage is that your data won't be available until after you restore it - so you'd need to use the backup NAS as primary while that's being done. But if you have a gigabit network it could finish a little faster, since creating a volume from scratch takes about the same time as a single resync (and you need to do two). It also gives you a completely clean file system.
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