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Alert Less than 20% of volume data's capacity is free. Performance on volume data will degrade
Firmware 6.10.3
I am seeing this allert Less than 20% of volume data's capacity is free. Performance on volume data will degrade if additional capacity is consumed. NETGEAR recommends that you add capacity to avoid performance degradation.
I curently have it filled with 4ea 4TB Red drives which give me a total of 10.9TB under raid 5. I have 2.96 TB left and I"m getting the above notice, first I started getting the 30% notice and now the 20% notice. I guess I am wondering I assumed the difference from 16TB total drive to the 10.9TB the overhead is taken up i the difference, but why am I getting the notice with almost 3 TB left ? All my drives look healthy ( I have just got the notice of the Update firmware but until I get this notice squared away I don't want to change the Firmware..
Hopefully this is an easy fix.
I have 2 of thes Nas set up the same way with the same drives so I guess at somepoint I'll have to deal with the 2nd on.
I'm not sure what else to add it seems to be a fairly well discussed subject.
Dave
davidk1952 wrote:
I assumed the difference from 16TB total drive to the 10.9TB the overhead is taken up i the difference,
Just to clarify the volume size. With XRAID/RAID-5 the volume capacity for 4x4TB is 12 TB. The other 4 TB are used for RAID parity blocks (which is what the system uses to rebuild a disk when it is replaced).
But the NAS reports sizes in TiB (1024*1024*1024*1024 bytes), not TB (1000*1000*1000*1000 TB). 12 TB is the same as 10.9 TiB.
2.26/10.9 is about 20% (slighty more, but there could be some accounted for space).
The warnings are quite conservative. Generally I expand my volume when free space drops to about 15%, and I haven't had any issues with stability.
FWIW, I do leave quotas on, so I can see the space used by every share.
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Hi davidk1952
This warning does seem to come too early in your case. With a volume of 10.9 TB you shouldn't see this warning till about 2.18 TB left. I wonder if quotas are causing some oddities here. I wouldn't mind taking a look at your logs if you want.
You can download the NAS logs into a zip file.
- Go to the ReadyNAS web admin page and navigate to "System" > "Logs".
- Here you will see an option to "Download Logs" on the right-hand side.
- This will download a zip file containing the logs.Once downloaded, then upload to Google drive, Dropbox or similar and give me a link to download them. PM me this link, don't share it publicly here on the forums.
CheersPerhaps I was not clean... the ballance left on the NAS is.2.26TB out of 10.9TB so, I am getting pretty close to what you said. So what happens when the NAS starts to get that full... I figure the difference from my Original 16TB to 10.9 is the overhead and backup. If you would still like me to send you the log but I'm not sure if it's just telling me I"m getting close... but how many TB can I actually have on the drive when you would consider it full.
I have not set up my email allert as yet, that's another story :-) but I keep a pretty good eye on the allerts.
rn_enthusiast wrote:Hi davidk1952
This warning does seem to come too early in your case. With a volume of 10.9 TB you shouldn't see this warning till about 2.18 TB left. I wonder if quotas are causing some oddities here. I wouldn't mind taking a look at your logs if you want.
You can download the NAS logs into a zip file.
- Go to the ReadyNAS web admin page and navigate to "System" > "Logs".
- Here you will see an option to "Download Logs" on the right-hand side.
- This will download a zip file containing the logs.Once downloaded, then upload to Google drive, Dropbox or similar and give me a link to download them. PM me this link, don't share it publicly here on the forums.
CheersJust sent a PM with the drop box link
Just sent you the dropbox link to the log.
Hi davidk1952
The disks and raid are healthy, which is good.
I want to point out that the NAS uses Tebibiyes not Terabytes (it's a Linux thing). So, your actual space is 10.9 Tib = 11.98468 TB. This makes sense given you have 4 x 4TB drives in a raid 5 config - i.e. one drive goes to redundancy, leaving you with ~12TB usable space (10.9 TiB).
The NAS makes a raid with a software called mdadm (Multidisk administration) and then it presents the raid as one whole device to the filesystem layer. Therefore, the filesystem is not aware of the underlying raid, in that sense. It also means that the raw 16TB has no place in the space usage calculations. The filesystem sees a device presented that is 10.9 TiB (~12TB) and it created a volume on that device, so from the filesystem perspective that is all there is to it. You have a volume of 10.9 TiB and it looks at how much is occupied by data out of the those 10.9 TiB and there is your calculation.
Looking at the filesystem stats, I can see that you indeed have a volume of 10.9 TiB and you have used exactly 8.64TiB. That is 79.26% space used. This means the warning you are getting is triggered correctly. The filesystem sees that 80% of the space is used and the NAS triggers a warning.
I will mention one thing here. The (BTRFS) filesystem quotas are looking wonky as we have seen before. This can sometimes lead to incorrect capacity calculations by the filesystem. I see references to subvolumes that don't exist and also see nonsense like below where it reports some fictitious subvolumes (shares/snapshots) are 16 Exbibyte in size:
=== qgroup /data ===
qgroupid rfer excl max_rfer
-------- ---- ---- --------
0/262 16.00EiB 16.00EiB none
0/270 16.00EiB 16.00EiB none
0/271 16.00EiB 16.00EiB none
0/1180 16.00EiB 16.00EiB none
0/1181 16.00EiB 16.00EiB none
0/1186 16.00EiB 16.00EiB none
0/1188 16.00EiB 16.00EiB none
0/1192 16.00EiB 16.00EiB none
0/1193 16.00EiB 16.00EiB none
0/4716 16.00EiB 16.00EiB none
0/4717 16.00EiB 16.00EiB none
It is obviously nonsense and simply a bi-product of BTRFS quotas being "finicky" and sometimes calculates incorrectly. We have seen this several times before. You read more about it hereWe also had a recent discussion about this topic in this thread
I would advise that you disable quotas and reboot your NAS. See if you get some "more space". You can re-enable them afterwards but I would suggest to keep them off. The only thing they provide are snapshot and share space consumption calculations for you to see - neither which are essentials.
To disable Quotas, go to admin web page and navigate to: "System" > "Volumes" > Click the cog-wheel next to your raid Volume > select "Settings". Once in Setting, select "Summary" on the left hand side. Here you Un-tick the box that says: "Quota" > Click "Apply" at the bottom. Afterwards, give the NAS a reboot.
Hope this helped. Cheers
davidk1952 wrote:
I assumed the difference from 16TB total drive to the 10.9TB the overhead is taken up i the difference,
Just to clarify the volume size. With XRAID/RAID-5 the volume capacity for 4x4TB is 12 TB. The other 4 TB are used for RAID parity blocks (which is what the system uses to rebuild a disk when it is replaced).
But the NAS reports sizes in TiB (1024*1024*1024*1024 bytes), not TB (1000*1000*1000*1000 TB). 12 TB is the same as 10.9 TiB.
2.26/10.9 is about 20% (slighty more, but there could be some accounted for space).
The warnings are quite conservative. Generally I expand my volume when free space drops to about 15%, and I haven't had any issues with stability.
FWIW, I do leave quotas on, so I can see the space used by every share.
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