[Ocfs2-announce] [Ocfs2-users] OCFS2 1.4.7-1 and OCFS2 Tools 1.4.4-1 released

Mon Apr 19 13:01:19 PDT 2010

It's a w-i-p. No timeline.

What is higher on our priority is preventing or reducing file fragmentation
upfront rather than fixing it later. In the next merge-window, we will push
Mark Fasheh's Allocation Reservation patch that reserves windows for files
that are extending to allow for more contiguous allocations.

David Murphy wrote:
> Sunil,
>
> Any chance  I can get  a timeline on  having a defrag tool to   make
> noncontiguous files become contagious?
>   
>
>
> David
>
> -----Original Message-----
> From: ocfs2-users-bounces at oss.oracle.com
> [mailto:ocfs2-users-bounces at oss.oracle.com] On Behalf Of Sunil Mushran
> Sent: Monday, April 19, 2010 1:08 PM
> To: ocfs2-announce at oss.oracle.com; ocfs2-users
> Subject: [Ocfs2-users] OCFS2 1.4.7-1 and OCFS2 Tools 1.4.4-1 released
>
> All,
>
> We are pleased to announce the release of OCFS2 1.4.7-1 and OCFS2 Tools
> 1.4.4-1 for Oracle's and Red Hat's Enterprise Linux 5 Update 2 and higher.
>
> Oracle's Unbreakable Linux Network users who are subscribing to the "OCFS2
> 1.4 packages for Enterprise Linux 5" channel can upgrade to this release
> by running up2date.
> http://oss.oracle.com/pipermail/el-errata/2010-April/001438.html
> http://oss.oracle.com/pipermail/el-errata/2010-April/001439.html
>
> Red Hat's Enterprise Linux 5 users can download and install the relevant
> file system and tools packages from oss.oracle.com.
> http://oss.oracle.com/projects/ocfs2/files/RedHat/RHEL5/
> http://oss.oracle.com/projects/ocfs2-tools/files/RedHat/RHEL5/
>
> COMPATIBILITY
>
> This release is fully compatible with earlier releases of OCFS2 1.4.
> Users can upgrade their nodes to the new version in a rolling manner.
>
> This release is on-disk compatible with OCFS2 1.2.x. Users can install
> the software and mount the older volumes as-is. However, a rolling upgrade
> from 1.2 to 1.4 will not work.
>
> RECOMMENDATION
>
> This is just to remind users to add the "noatime" mount option to the
> mounts that hold the Oracle datafiles, redologs, archivelogs, voting file,
> etc. This is for OCFS2 1.4 only.
>
> WHAT'S CHANGED
>
> This release includes mostly bug fixes.
>
> The one new feature we've added is not much of one. It allows users
> to change the fence method from the default of machine reset to panic.
> This was requested by some developers who are interested in the vmcore
> dump that is generated when a machine panics. So unless you want the
> same, our recommendation would be for you to leave the fence method as-is.
> Do note that the fence method of a node can be toggled between "reset"
> and "panic" at anytime.
>
> To view the current fence method, do:
> # cat /sys/kernel/config/cluster/CLUSTER/fence_method
> reset
>
> To change to panic, do:
> # echo panic > /sys/kernel/config/CLUSTER/cacl10/fence_method
> # cat /sys/kernel/config/cluster/CLUSTER/fence_method
> panic
>
> The bug fixes can be classified under three groupings. The first group
> involves cluster locking. Specifically in the area of downconverting
> cluster locks. The links below explain two of the more interesting
> problems. Our thanks to David Teigland of Red Hat for helping us fix
> these problems.
> http://oss.oracle.com/git/?p=ocfs2-1.4.git;a=commit;h=e8ef96c444326e4262fd37
> 1729e7beebda1af4d1
> http://oss.oracle.com/git/?p=ocfs2-1.4.git;a=commit;h=39febfd5ee7948c018b667
> e0b909886e1cfa1235
>
> The second group of bug fixes concern NFS support. This release fixes
> a nfsd lockup issue and a stale inode read problem. Again, the links
> below describe the problems in detail.
> http://oss.oracle.com/git/?p=ocfs2-1.4.git;a=commit;h=2d561d3636c80af24063a7
> 4ae8c817661c574d78
> http://oss.oracle.com/git/?p=ocfs2-1.4.git;a=commit;h=aa20775d1e7feba9b22e76
> 1fa9b69bd5c3f043bd
>
> The last group of fixes concerns users encountering erroneous out-of-space
> errors. Our analysis found that the errors were triggered because the file
> system could not grow the extent block allocator because of free space
> fragmentation. The extent block allocator houses the extent blocks 
> that are
> used when an inode needs more than approx 250 extents to describe a file.
> So the way this plays out is that, in the early going, when free space is
> contiguous, the inodes rarely use the extent blocks. They start getting
> used just when the free space is fragmented enough that the extent 
> allocator
> cannot be grown.
>
> The sad part is that the space required by this allocator is typically 
> very
> small. So small that there was no reason we could not allocate it up 
> front.
> In this release, the format tool, mkfs.ocfs2, reserves upto 0.3% of the
> volume
> for this allocator. Furthermore, if the file system finds that this
> allocator
> cannot be grown, it now can steal free blocks from another slot's 
> allocator.
> The first fix will help newly formatted volumes. The second fix will also
> help existing volumes.
>
> The final fix for this problem will be provided in the next patch update
> (1.4.8). In it, we will allow the block allocators (inode and extent) 
> to be
> grown even when a 4MB contiguous chunk is not available. Users will be
> able to activate this feature (discontiguous block groups) on existing
> volumes. This feature is currently in testing.
>
> BUGS FIXED
>
> ossbz#970 Unfair postponement of local lock requests (Livelock)
> ossbz#1175 BUG in dlm_free_dead_locks() (Oops during dlm recovery)
> ossbz#1178 BUG in ocfs2_prepare_downconvert() (Oops during downconvert)
> ossbz#1189 Free space trouble in a ocfs2 partition (ext_alloc cannot be
> grown)
> ossbz#1202 dlm_add_lock_to_array:1192 ERROR: mismatched lvbs! (lock
> migration)
>
> FEEDBACK
>
> Please do not hesitate to email us at the ocfs2-users at oss.oracle.com
> with any questions and comments.
>
> The OCFS2 Team
>
> OCFS2: http://oss.oracle.com/projects/ocfs2
> TOOLS: http://oss.oracle.com/projects/ocfs2-tools
> DOCS : http://oss.oracle.com/projects/ocfs2/documentation/
>
>
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