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-boun...@oss.oracle.com > [mailto:ocfs2-users-boun...@oss.oracle.com] On Behalf Of Sunil Mushran > Sent: Monday, April 19, 2010 1:08 PM > To: ocfs2-annou...@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/ > > > _______________________________________________ > Ocfs2-users mailing list > Ocfs2-users@oss.oracle.com > http://oss.oracle.com/mailman/listinfo/ocfs2-users > _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com http://oss.oracle.com/mailman/listinfo/ocfs2-users
