Configure write cache option of tgtd iscsi driver
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
openstack-manuals |
Fix Released
|
High
|
Gauvain Pocentek |
Bug Description
https:/
commit 617e59bde660f91
Author: Mitsuhiro Tanino <email address hidden>
Date: Tue Jul 8 15:52:11 2014 -0400
Configure write cache option of tgtd iscsi driver
Cinder LVMiSCSI driver is using default value of write-cache parameter
of tgtd iscsi driver. In this setting, write I/O from guest instance is
cached on dirty cache of a host.(write-back mode)
In this case, data lost may be occurred if the host crashes before
flushing dirty cache. This may cause a lot of instances to lose
their data.
In order to avoid this issue, it is better to turn off the write cache.
(write-through mode)
This patch adds "iscsi_write_cache" parameter to configure a behavior of
write cache. The default value is "iscsi_
Closes-Bug: 1336568
DocImpact
Change-Id: I7a495bc6118d42
Signed-off-by: Mitsuhiro Tanino <email address hidden>
Changed in openstack-manuals: | |
status: | New → Confirmed |
tags: | added: config-reference |
Changed in openstack-manuals: | |
importance: | Undecided → High |
Fix proposed to branch: master /review. openstack. org/115256
Review: https:/