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Bug 1065474 - Size of external origin needs to be aligned with thin pool chunk size
Summary: Size of external origin needs to be aligned with thin pool chunk size
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kernel
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Joe Thornber
QA Contact: yanfu,wang
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-02-14 18:07 UTC by Zdenek Kabelac
Modified: 2021-09-06 14:59 UTC (History)
12 users (show)

Fixed In Version: kernel-3.10.0-140.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 11:37:06 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0290 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2015-03-05 16:13:58 UTC

Description Zdenek Kabelac 2014-02-14 18:07:12 UTC 
Description of problem:

Thin pool target has limitation in the use of external origin device size.
If the chunk size is not a power of 2  (i.e. data device is stripe across 3 disks with 64k chunk - combined into 192k stripe/pool chunk_size/block_size) and external origin is just aligned to MB (i.e. 4M extent boundary) it cannot be used - since the last  'unaligned' chunk is not provisioned so any write to the end of thin volume which uses this external is lost.

The latest version of lvm2 prohibits this combination (so can't be easily used to reproduce this bug, unless patching code)
Once the thin pool target is upgraded to support this combination,
new property could be used to enable support for this.

The bug could be also related to Bug 1030411.

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

thin pool target version 1.10

How reproducible:


Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Comment 2 yanfu,wang 2014-03-04 03:41:50 UTC 
Hi Zdenek,
Could QE know what test steps to reproduce the issue? thanks
Comment 3 Zdenek Kabelac 2014-03-04 09:09:19 UTC 
This bug is mainly for tracking kernel bug in target.
Lvm2 currently detects unsupported sizes and doesn't allow to active/create such combination of external origin and thin pool.

lvm2 test suite:

https://git.fedorahosted.org/cgit/lvm2.git/tree/test/shell/lvcreate-thin-external.sh

<<<
vgcreate $vg -s 64K $(cat DEVICES)
# Test validation for external origin being multiple of thin pool chunk size
lvcreate -L10M -T $vg/pool192 -c 192k
lvcreate -an -pr -Zn -l1 -n $lv1 $vg
not lvcreate -s $vg/$lv1 --thinpool $vg/pool192
>>>

VG uses 64K extent - pool has 192K chunks and external origin has just one 64K extent - this will not work in current thinpool driver  and lvm2 must not allow to use this combination. More combination tests like this are possible.
Comment 4 Tom Coughlan 2014-03-04 14:51:01 UTC 
(In reply to Zdenek Kabelac from comment #3)

> Lvm2 currently detects unsupported sizes and doesn't allow to active/create
> such combination of external origin and thin pool.

Moving this to 7.1.
Comment 8 Jarod Wilson 2014-07-29 18:22:58 UTC 
Patch(es) available on kernel-3.10.0-140.el7
Comment 13 errata-xmlrpc 2015-03-05 11:37:06 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0290.html
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