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trying to avoid a lengthy quotacheck by deleting all quota data

To: xfs@xxxxxxxxxxx
Subject: trying to avoid a lengthy quotacheck by deleting all quota data
From: Harry <harry@xxxxxxxxxxxxxxxxxx>
Date: Tue, 24 Feb 2015 15:15:26 +0000
Delivered-to: xfs@xxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.4.0
Hi there,

We've got a moderately large disk (~2TB) into an inconsistent state, such that it's going to want a quotacheck the next time we mount it (it's currently mounted with quota accounting inactive). Our tests suggest this is going to take several hours, and cause an outage we can't afford.

We're wondering whether there's a 'nuke the site from orbit' option that will let us avoid it. The plan would be to:
- switch off quotas and delete them completely, using the commands:
  -- disable
  -- off
  -- remove
- remount the drive with -o prjquota, hoping that there will not be a quotacheck, because we've deleted all the old quota data - run a script gradually restore all the quotas, one by one and in good time, from our own external backups (we've got the quotas in a database basically).

So the questions are:
- is there a way to remove all quota information from a mounted drive?
(the current mount status seems to be that it tried to mount it with -o prjquota but that quota accounting is *not* active) - will it work and let us remount the drive with -o prjquota without causing a quotacheck?

Answers on a postcard, received with the utmost gratitude.

Rgds,
Harry + the PythonAnywhere team.

--
Harry Percival
Developer
harry@xxxxxxxxxxxxxxxxxx

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