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Bug #4951

ZFS administrative commands should use reserved space, not fail with ENOSPC

Added by Matthew Ahrens about 5 years ago. Updated about 5 years ago.

Status:
Closed
Priority:
Normal
Category:
zfs - Zettabyte File System
Start date:
2014-07-01
Due date:
% Done:

100%

Estimated time:
Difficulty:
Medium
Tags:
needs-triage

Description

We should allow rollbacks when we have less than the 1.6% reserved
"slop" space, but not when we have less than 0.8% "super
reserved" space. On reasonable sized pools, this should allow enough rollbacks
before the stack gets to deleting/rolling back something big that results in
substantially more free space.

We will apply this "super reserved" space for all
administrative actions. I.e. ZPL/zvol access (e.g. write() system calls) would
get ENOSPC when the pool has <1.6% free space, but administrative commands
(e.g. rollback, zfs set, etc) would not get ENOSPC until there is <0.8% free
space.

History

#1

Updated by Electric Monk about 5 years ago

  • Status changed from New to Closed
  • % Done changed from 0 to 100

git commit 7d46dc6ca63a6f3f0d51aa655bfcf10cf2405a9e

commit  7d46dc6ca63a6f3f0d51aa655bfcf10cf2405a9e
Author: Matthew Ahrens <mahrens@delphix.com>
Date:   2014-07-09T04:49:57.000Z

    4951 ZFS administrative commands should use reserved space, not fail with ENOSPC
    Reviewed by: John Kennedy <john.kennedy@delphix.com>
    Reviewed by: George Wilson <george.wilson@delphix.com>
    Reviewed by: Christopher Siden <christopher.siden@delphix.com>
    Reviewed by: Dan McDonald <danmcd@omniti.com>
    Approved by: Garrett D'Amore <garrett@damore.org>

#2

Updated by Electric Monk about 5 years ago

git commit c39f2c8cacf297ec37acd421f4c4fec127991995

commit  c39f2c8cacf297ec37acd421f4c4fec127991995
Author: Christopher Siden <chris@delphix.com>
Date:   2014-07-11T02:57:59.000Z

    4951 ZFS administrative commands should use reserved space, not fail with ENOSPC (fix call)
    Approved by: Christopher Siden <christopher.siden@delphix.com>

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