Bug 814833 - dm-thin: handle running out of data or metadata space cleanly
Summary: dm-thin: handle running out of data or metadata space cleanly
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.4
Hardware: Unspecified
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Joe Thornber
QA Contact: Cluster QE
URL:
Whiteboard:
Depends On: 814826
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-04-20 19:23 UTC by Alasdair Kergon
Modified: 2012-11-21 18:36 UTC (History)
9 users (show)

Fixed In Version:
Doc Type: Enhancement
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-11-21 18:36:27 UTC
Target Upstream Version:

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Description Alasdair Kergon 2012-04-20 19:23:02 UTC 
If a thin pool runs out of space (for data or metadata) either

a) gracefully make the device read-only

or

b) queue further write I/O until more space is supplied to the device

according to a configuration option.  (Similar to mpath's queue_if_no_path.)
Comment 1 RHEL Program Management 2012-07-10 08:25:26 UTC 
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
Comment 2 RHEL Program Management 2012-07-10 23:36:45 UTC 
This request was erroneously removed from consideration in Red Hat Enterprise Linux 6.4, which is currently under development.  This request will be evaluated for inclusion in Red Hat Enterprise Linux 6.4.
Comment 3 Mike Snitzer 2012-11-21 18:36:27 UTC 
If data fills then the low water mark will have been triggered and the associated thin device will queue IO waiting for userspace to add more space to the pool.

If metadata fills the thin pool should switch to read-only mode.
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