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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 ad...
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.
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.
Cheers
Perhaps 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. CheersWell, thanks for all the information and I will take our suggestion on Quotas and see what I end up with...
that is interestiong about the TBvs TiB I've been in the computer business since the early 80's and that's the first time I've heard of that, but I don't do anyting with Lynix directly but makes sense.
Like I said, I have 2 of these units, I really like them and they are easy to work with.
I notice there is a firmware update noted for the RN204 firmware should I do the firmware update first then deal with the Quota? or do the Quota, reboot and then up date?
Finally.. if I wanted to up the drive size to 8TB drives would you suggest backing all the files to an external drive and then do the upgrade vs trying to replace and rebuild the NAS?
Or what new NAS would you suggest I"m always looking to add to my server room :-)
Dave
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