Bug 700325

Summary:	man page of mount missing the discard option for ext4
Product:	Red Hat Enterprise Linux 6	Reporter:	Kirby Zhou <kirbyzhou>
Component:	util-linux-ng	Assignee:	Karel Zak <kzak>
Status:	CLOSED NEXTRELEASE	QA Contact:	qe-baseos-daemons
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.0
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2011-04-29 14:19:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Kirby Zhou 2011-04-28 07:02:21 UTC

Description of problem:

At present, ext4 is the only fully-supported file system that supports TRIM. To enable TRIM commands on a device, use the mount option discard. For example, to mount /dev/sda2 to /mnt with TRIM enabled, run:
mount -t ext4 -o discard /dev/sda2 /mnt
By default, ext4 does not issue the TRIM command. This is mostly to avoid problems on devices which may not properly implement the TRIM command. The Linux swap code will issue TRIM commands to TRIM-enabled devices, and there is no option to control this behaviour.

BUY man page of mount missing the discard option for ext4.


Version-Release number of selected component (if applicable):

util-linux-ng-2.17.2-6.el6.x86_64

Comment 2 RHEL Program Management 2011-04-29 06:00:54 UTC

Since RHEL 6.1 External Beta has begun, and this bug remains
unresolved, it has been rejected as it is not proposed as
exception or blocker.

Red Hat invites you to ask your support representative to
propose this request, if appropriate and relevant, in the
next release of Red Hat Enterprise Linux.

Comment 3 Karel Zak 2011-04-29 14:19:00 UTC

This will be fixed in the pending RHEL6.1 update.