ReadyNAS 316 - Out of memory #26736919

[cs_giuseppe]

Hi,

I have a 316 with 4 WD red 6TB x-raid (raid6) that came out with the error out of memory then the nas was unreachable.

After a forced shudown and boot the nas was reachable for few minutes the came out the out of memory error.

Now I boot in read only mode and the nas is up. I download the logs but I don't found error for my competence.

No warning, all disk are ok, no smart error.

Hany idea?

Firmware is 6.4.1.

Space: 5,37 TB Used; 2,10 TB Snapshots; 3,44 TB Free.

Could be many snapshots? I found some old automatic snapshot that are not deleted during normal maintenance.

Thanks for any help/suggestion.

[cs_giuseppe · Accepted solution]

Hi all,

support Engineering analized my system and found nothing to help resolving the issue 

The only solution is putting the nas in read only mode, backup the data and made a facory reset      

Giuseppe

[mdgm-ntgr]

Please email me the logs zip file (see the Sending Logs link in my sig).

[cs_giuseppe]

HI mdgm,

logs sent.

Thanks for the precious support !!!

Giuseppe

[mdgm-ntgr]

Thanks for the logs.

You do have a lot of snapshots and I can see that there is a high level of fragmentation as a result.

It seems this NAS is mainly used for backups? Is it used for anything else.

We don't recommend taking snapshots on the NAS for backups from your PC. With a huge number of modifications in place to files you will get a huge amount of fragmentation.

It is better to selectively use snapshots for shares for which they are appropriate.

The same applies to the bit-rot protection option (which we link to enabling/disabling CoW though they are two separate things).

Snapshots use CoW at the point in time that they are taken. With CoW when you write changes to files the changes do not overwrite the existing data so with a lot of changes in place you will get a lot of fragmentation.

I would suggest backing up your data, doing a factory default (wipes all data, settings, everything), configuring the shares appropriately and then restoring your data from backup.

[cs_giuseppe]

Hi mdgm,

thanks for the reply.

Yes tha nas is used as a backup device for is big capacity, The snapshot are necessary because we need version of the original files in case of mistakes or ramsomware.

There is a possibility for deleting older snapshot putting the nas in remote support mode?

Before a factory reset I want to try all possibilities

Thanks, Giuseppe

[mdgm-ntgr]

I have sent you a PM. I would suggest that you update your support case with the information that I requested.

[cs_giuseppe]

Hi all,

tech support is analizing the nas and btrfs metadata.......

Giuseppe

[mdgm-ntgr]

Thanks for the update.

[cs_giuseppe · Accepted solution]

Hi all,

support Engineering analized my system and found nothing to help resolving the issue 

The only solution is putting the nas in read only mode, backup the data and made a facory reset      

Giuseppe

[LifeVibes]

Welcome to the club, although RN104 for us, and even then its not sure its really fixed after factory default.

Reappeared after a month for us after restoring backup on new SW version, see https://community.netgear.com/t5/Using-your-ReadyNAS/Readynas-104-out-of-memory-390-won-t-boot-anymo...

[mdgm-ntgr]

Well nearly 57GiB of metadata on an 11TiB volume is  a huge amount of metadata. I have a bit over 14GiB of metadata on a volume with a capacity a little under 22TiB and I have about 1.5x the amount of data on my volume compared with what you have.

When the NAS is configured incorrectly for your use case and you get a huge amount of fragmentation you will run out of memory if you don't deal with the problem. It will take longer and a greater amount of fragmentation than with the 100 series, but it can still happen eventually.

[LifeVibes]

Seeing that it also happened just a month after a factory reset for us, just restoring backup and no data changes anymore after that, no apps, no AV, just daily snapshots enabled, all metadata was purely generated by NAS (only 28 snapshots, which shouldnt contain much delta as there were no changes).

So also dont see what could be configured wrong in this case.

BTW seems I screwed up the link above, should be https://community.netgear.com/t5/Using-your-ReadyNAS/Readynas-104-out-of-memory-390-won-t-boot-anymo...

[mdgm-ntgr]

OOM is a generic error. It can be caused by a variety of different things. Anything that causes the NAS to run out of memory.

The 100 series is very different hardware to the 300 series.