Bug 1464350 - Posix xlator needs to reserve disk space to prevent the brick from getting full.
Posix xlator needs to reserve disk space to prevent the brick from getting full.
Status: POST
Product: Red Hat Gluster Storage
Classification: Red Hat
Component: posix (Show other bugs)
3.3
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Mohit Agrawal
Rahul Hinduja
: ZStream
Depends On:
Blocks: 1173519 1286092 1398595 1471366 1476158
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Reported: 2017-06-23 03:48 EDT by Nithya Balachandran
Modified: 2017-07-28 03:41 EDT (History)
2 users (show)

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: 1471366 1476158 (view as bug list)
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Description Nithya Balachandran 2017-06-23 03:48:41 EDT
Description of problem:

Once a brick becomes completely (100%) full, the gluster filesystem becomes inconsistent as xattr operations fail and recovery is very difficult.

A rebalance cannot be used to migrate data off the full brick as xattr operations will fail.

DHT uses a min-free-disk option to try to keep some reserve space on all bricks. However, this approach is not fool proof and should ideally be handled by the posix xlator. 

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Comment 3 Mohit Agrawal 2017-07-16 21:57:36 EDT
Patch is posted on upstream 

https://review.gluster.org/#/c/17780/

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