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authorMike Snitzer <snitzer@redhat.com>2013-12-06 16:21:43 -0500
committerMike Snitzer <snitzer@redhat.com>2014-01-07 10:14:30 -0500
commit787a996cb251e20f560e1615cd85693562541a7a (patch)
tree86cb09bf6a76217236469ec56b8f609f6141380f /Documentation/device-mapper
parent8c0f0e8c9f07e6554b2281f86f00e769cf805fd9 (diff)
dm thin: add error_if_no_space feature
If the pool runs out of data or metadata space, the pool can either queue or error the IO destined to the data device. The default is to queue the IO until more space is added. An admin may now configure the pool to error IO when no space is available by setting the 'error_if_no_space' feature when loading the thin-pool table. Signed-off-by: Mike Snitzer <snitzer@redhat.com> Acked-by: Joe Thornber <ejt@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
-rw-r--r--Documentation/device-mapper/thin-provisioning.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/device-mapper/thin-provisioning.txt b/Documentation/device-mapper/thin-provisioning.txt
index 50c44cf79b0e..8a7a3d46e0da 100644
--- a/Documentation/device-mapper/thin-provisioning.txt
+++ b/Documentation/device-mapper/thin-provisioning.txt
@@ -235,6 +235,8 @@ i) Constructor
read_only: Don't allow any changes to be made to the pool
metadata.
+ error_if_no_space: Error IOs, instead of queueing, if no space.
+
Data block size must be between 64KB (128 sectors) and 1GB
(2097152 sectors) inclusive.
@@ -276,6 +278,11 @@ ii) Status
contain the string 'Fail'. The userspace recovery tools
should then be used.
+ error_if_no_space|queue_if_no_space
+ If the pool runs out of data or metadata space, the pool will
+ either queue or error the IO destined to the data device. The
+ default is to queue the IO until more space is added.
+
iii) Messages
create_thin <dev id>