Bug 651021 – Enable discard/UNMAP/WRITE_SAME for enterprise class arrays

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Bug 651021 - Enable discard/UNMAP/WRITE_SAME for enterprise class arrays

Summary:	Enable discard/UNMAP/WRITE_SAME for enterprise class arrays

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	6.0
Hardware:	All Linux

Priority	low Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Lukáš Czerner
QA Contact:	Petr Beňas
Docs Contact:

URL:
Whiteboard:
Keywords:	Upstream

Depends On:
Blocks:
	Show dependency tree / graph

Reported:	2010-11-08 11:57 EST by Lukáš Czerner
Modified:	2015-01-04 17:59 EST (History)
CC List:	6 users (show)

See Also:
Fixed In Version:	kernel-2.6.32-112.el6
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-05-23 16:28:25 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Testcase (patch for xfstests-dev) (12.03 KB, patch) 2010-11-26 09:10 EST, Lukáš Czerner	no flags	Details \| Diff
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0542	normal	SHIPPED_LIVE	Important: Red Hat Enterprise Linux 6.1 kernel security, bug fix and enhancement update	2011-05-19 07:58:07 EDT

Groups: None (edit)

Description Lukáš Czerner 2010-11-08 11:57:53 EST

Description of problem:

Enterprise storage arrays typically support discards in very large chunks. Our existing implementation issues the discard commands in multiples of small, file
system block units (4KB typically).  Arrays often ignore small requests so we need to support large, array specific minimum discards to enable this feature for them.

Additional info:

This has been fixed in upstream kernel 2.6.37-rc1. The fix involves subsequent commits:

77ca6cdf0ab8a42f481ec997911bc89e79138723
367a51a339020ba4d9edb0ce0f21d65bd50b00c9
7360d1731e5dc78aec867e65e55f9fb58782b5fe
27ee40df2b17c84aa7855907df12befe6869b7a7

Comment 2 Lukáš Czerner 2010-11-26 09:10:22 EST

Created attachment 463085 [details]
Testcase (patch for xfstests-dev)

Comment 3 Lukáš Czerner 2010-11-26 09:10:56 EST

It was already posted for inclusion into RHEL6.1. I have tested it myself with xfstests-dev, unfortunately the test is not upstream yet, but you can use attached patch for latest xfstests-dev.

Thanks!

-Lukas

Comment 4 Ric Wheeler 2010-12-01 12:57:10 EST

This BZ should be ready for 6.1. Can we get QE & PM acks please?

Comment 6 RHEL Product and Program Management 2010-12-02 11:40:03 EST

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

Comment 7 Aristeu Rozanski 2011-02-03 11:38:15 EST

Patch(es) available on kernel-2.6.32-112.el6

Comment 11 Petr Beňas 2011-02-15 04:23:29 EST

Verified sanityonly in 2.6.32-106.el6.

Comment 13 errata-xmlrpc 2011-05-23 16:28:25 EDT

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html

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