[LU-921] generate warnings in case of discarding dirty pages

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.0, Lustre 2.1.4
• Affects Version/s: Lustre 1.8.x (1.8.0 - 1.8.5)
• Environment: sles10sp3, sles11sp1, centos5.6, centos6
• Severity: 3
• Bugzilla ID: 21,812
• Assignee: Hongchao Zhang
• Reporter: Jay Lan (Inactive)

Description

"NASA/AMES is asking for the ability to be able to tell users which files may be suspect after an
adverse cluster event; panics, hangs, client evictions, etc.

One example that may be easier than others is when a client is evicted and the client is forced to
toss dirty pages of open files. The site has been experimenting with a way to list the inode
numbers on the mds with the associated pages tossed on the clients. I'll leave it to them to
discuss here.
" – from Oracle BZ 21812.

Oracle has released a patch (attachment 33114.) It affected client side. We like Whamcloud to include this patch for 1.8.x and 2.1.x.

Issue Links

• is related to: LU-2505 lfsck: BUG: soft lockup - CPU#0 stuck for 67s! [umount:22194]
• Trackbacks: Lustre 1.8.x known issues tracker While testing against Lustre b18 branch, we would hit known bugs which were already reported in Lustre Bugzilla https://bugzilla.lustre.org/. In order to move away from relying on Bugzilla, we would create a JIRA

Comments

[Peter Jones]

Jay

Can you please confirm whether the patch meets your needs?

Thanks

Peter

[Hongchao Zhang]

the updated patch has been pushed to Gerrit

[Peter Jones]

Jay

I will take this up with you offline

Peter

[Jay Lan (Inactive)]

There is no activity on this LU for almost 6 months. This fix is very important to use. Could you upgrade the priority? Thanks!

[Hongchao Zhang]

the patch is tracked at http://review.whamcloud.com/#change,1908

[Hongchao Zhang]

status update:
the patch is under creating and test.

[Jay Lan (Inactive)]

I cherry-picked Oracle's patch for our nas-1.8.6 branch without a problem. But, the patch applied to code that do not exist in 2.1.

Our Lustre system admin consider this a very useful feature to them and we need your expertise to port the feature to 2.1. Thanks!

[Peter Jones]

Hongchao

Could you please look at what would be required to provide this capability in a Whamcloud release. The current approach needs several adjustments. Please talk to Johann for details.

Peter