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 "It is strongly recommended to run quotacheck with quotas turned off for  the  filesys-
  tem.  Otherwise, possible damage or loss to data in the quota files can result.  It is
  also unwise to run quotacheck on a live filesystem as actual usage may  change  during
  the  scan.   To  prevent  this,  quotacheck  tries to remount the filesystem read-only
  before starting the scan.  After the scan is done it  remounts  the  filesystem  read-
  write.  You  can disable this with option -m.  You can also make quotacheck ignore the
  failure to remount the filesystem read-only with option -M."

Accoridng to this the only consequence of parallel running of
'quotacheck' is a somewhat inaccurate accounting of quotas.

> I think the best idea to improve the performance in case you
> did a repair is to integrate the quotacheck code into repair.

Probably this should be 'xfs_check' more than 'xfs_repair'...

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