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1475
March 9th, 2012 06:00
Disabling Quotas on NFS file system
On our Cellera NS80, the quotas was activated on some file system and seems that we now reach the soft limit of 4 TB... So, some users/groups aren't able to save data anymore. We opened a call with EMC and they replied us to disable quotas if we don't use it. Which is the case, as we didn't put any quota limit in place, only the 4TB soft limit is now reach ( seems to be the limit in 5.6 ). Now, we are trying to evaluate the impact of disabling quotas on a FS. Here is the command we are looking to run :
nas_quotas -off -both -fs ( repeat this for each file system where quota is activated )
We got 6 file system on which we need to run this command, the largest one got 741 GB of data in it and the smallest got 80GB of data.
We heard that this command is disruptive and we are still trying to figure out how disruptive it is.
First question, how long this command could take to run ? I assume not so long as it is a removal of the quota, so no calculation should be required, right ?
Second question, how disruptive this will be ? Only the file system is affected or the whole NFS service will be temporary unreachable ?
Third question, is there any risk that something blow up/get corrupted when running this command ?
Our Cellera NS80 expert left, and I'm kind of new to all this, so, was to be carefull before doing anything on the NAS.
Thanks for your help.
rehwu
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March 13th, 2012 11:00
So, we did the removal of the quotas on our NFS filesystem over the last weekend and it took about few second to run the command on each filesystem. It was so quick, that we didn't had the time to see if there was any issue on our service. But everything went well on Monday morning, so, we assumed that it was not disruptive at all.
Our largest file system was about 800 GB.
Thanks all for your comment.
rehwu
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March 9th, 2012 07:00
Here is what I got:
# nas_version
5.6.44-4
Rainer_EMC
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8.6K Posts
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March 9th, 2012 07:00
What DART version are you running – see the output of nas_version ?
rehwu
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March 9th, 2012 10:00
Actually, EMC is recommending us to disable the quotas or do the upgrade. But as it is affecting now the production users, we took the initiative to disable the quotas first, while planning the upgrade in parallel.
I had a look at the documentation, and we are already setup to not to deny disk space and users are getting error message when a user or a group is above 4TB, don't ask me why.... But don't think, we are set to block... anyway changing policy will required a reboot which will required a longer downtime, that's why we still prefer to remove the quotas as we don't use them at all anyway.
I will update this post when we will be done. The impact of doing so, will then be documented.
A big Thanks for your reply.
Rainer_EMC
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8.6K Posts
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March 9th, 2012 10:00
Actually – have you looked at the quota manual whether this is really necessary ?
Please read the section about the 4 TB quota limit carefully.
It might be enough to just change the policy to block and to not to deny disk space
Rainer_EMC
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March 9th, 2012 10:00
Just what I thought – 5.6.44 pretty old – we are not at 5.6.52
Please upgrade – there are a number of quota related fixes the later patch levels
See Powerlink Home -> Support - > Technical Documentation - > Hardware Platforms -> Celerra Network Server -> Release Notes
If your model supports 6.0 – 6.0.41 introduced greater than 4TB quotas
I haven’t tried t on 5.6 but disabling quota’s shouldn’t take long – its enabling and quota recalc that takes time
Rainer