similar to: btrfs timeline - fragmentation and delayed allocation

What about multiple errors detection with crc32? Is it work? Thanks.

On Mon, Oct 11, 2010 at 6:46 PM, Calvin Walton <calvin.walton@gmail.com> wrote: > On Mon, 2010-10-11 at 03:30 +0300, Felipe Contreras wrote: >> I use btrfs on most of my volumes on my laptop, and I''ve always felt >> booting was very slow, but definitely sure is slow, is starting up >> Google Chrome: >> >> encrypted ext4: ~20s >> btrfs: ~2:11s

Hi! Till now I thought btrfs does not use journaling at all, but utilize COW approach for operations atomicity. But, when I have seen in "Btrfs Timeline": July 31, 2008: Data=ordered mode support, preventing null bytes in a file after a crash. I have begun to doubt - whether I correctly understand atomicity and transactions concepts of btrfs. Please, can you clear these doubts? Is btrfs

Someone recently posted the following statement midway down the page at http://forums.gentoo.org/viewtopic-t-305871-postdays-0-postorder-asc-highlight-ext3+ordered+data-start-25.html >You don't need to defragment ext2/ext3 because as you use the >filesystem file blocks and inodes are moved around and reallocated >to keep the data nearly contiguous. It's not perfect, but it

This commit fixes three issues on non-auto defrag path (defragfs.ocfs2 doesn't set OCFS2_MOVE_EXT_FL_AUTO_DEFRAG on range.me_flags): - For ocfs2_find_victim_alloc_group(), old code forgot enlarge bitmap range for global_bitmap case. Old code could generate negative vict_bit. - For ocfs2_probe_alloc_group(), old code forgot back off move_len when finding enough bitmap space. Old code has

This fixes three issues on move extents ioctl without auto defrag: a) In ocfs2_find_victim_alloc_group(), we have to convert bits to block first in case of global bitmap. b) In ocfs2_probe_alloc_group(), when finding enough bits in block group bitmap, we have to back off move_len to start pos as well, otherwise it may corrupt filesystem. c) In ocfs2_ioctl_move_extents(), set me_threshold both for

Hello everybody, reading about the speed improvements possible with (on boot) preloaded files (which should be continuous on disk) I searched for a ext3 defrag program. I found an ext2 defrag program (http://www.ibiblio.org/pub/Linux/system/filesystems/defrag-0.70.tar.gz, available in debian as defrag) which would have an optimal feature (moving files by a list) but refuses to work on ext3.

A) Resilver = Defrag. True/false? B) If I buy larger drives and resilver, does defrag happen? C) Does zfs send zfs receive mean it will defrag? -- This message posted from opensolaris.org

On 2/20/23 1:05 PM, Heming Zhao wrote: > This fixes three issues on move extents ioctl without auto defrag: > > a) In ocfs2_find_victim_alloc_group(), we have to convert bits to block > first in case of global bitmap. > b) In ocfs2_probe_alloc_group(), when finding enough bits in block group > bitmap, we have to back off move_len to start pos as well, otherwise it > may

Hi list, I have a few large image files (VMware workstation VMDKs and TrueCrypt containers) which I routinely back up over the network to a btrfs raid10 volume via bigsync (https://code.google.com/p/bigsync/). The VM images in particular get really fragmented due to CoW, which is expected. I haven''t yet switched off CoW on the backups directory mainly to experiment and see what

Kernel 3.1-rc8 btrfs-progs-0.19 mount options: noatime,autodefrag (space_cache is enabled) There are snapshots present on the filesystem. When I do a btrfs fi defrag on a file, the file becomes much more fragmented. The end result can be a file with 20k times more fragments than before. Initially I thought the extents were just smaller but were next to each other, so I checked with both

Hi all, Fewer days ago a CentOS box server suffered a manual and unexpected reset (too large to explain: there are silly people in everywhere). The result was the system did not mount de root (/) partition and the boot process was stopped. I repair it easily: boot from LiveCD (Knoppix in my case), umount root partition and pass the e2fsck utility. Because of that I've used several fs tools

Hello all, I understand that relatively high fragmentation is inherent to ZFS due to its COW and possible intermixing of metadata and data blocks (of which metadata path blocks are likely to expire and get freed relatively quickly). I believe it was sometimes implied on this list that such fragmentation for "static" data can be currently combatted only by zfs send-ing existing

I found this thread from a few months ago that seems to have been started by someone with the same problem I have, but it was not resolved: https://www.redhat.com/archives/ext3-users/2005-March/msg00000.html I have been trying to speed up my boot times and I notice that a lot of time is spent waiting on IO. Even with readahead-list precacheing files, it is reading at less than 1/4 of my

Hi, I''ve been using btrfs for my root partition for about a month on archlinux and recently Ive started using the i3 window manager and starting X manually and I now boot to run level 3 (multi-user.target for systemd) and Ive noticed that booting archlinux on a btrfs root, there is a lot off hdd chatter after the login prompts are displayed, which doesnt happen with ext4 on root, so I

I've read in many places that file systems on Linux do not suffer the same fragmentation problems of Windows systems. No one has provided a clear explanation as to why fragmentation is not an issue for file systems such as ext2/3, reiserfs, xfs, etc. Just curious.

Hi, I have 4 machines, all converted to BTRFS about 6 months ago, now all running Ubuntu Quantal with kernel 3.5.0-17 The matter is that all these machines are now getting slower and slower everyday, every disk access causing the disk to be 100% busy for long periods, to the point that I''m now seriously considering migrating everything back to ext4... From the start BTRFS was "not

Hi, first of all, apologies if this isn't the right mailing list but it was the best I could find. If you know a better mailing list, please tell me. Today I tried to defrag one of my filesystems. It's a 3.5T large filesystem that has 6 software-raids in the bottom and then merged together using lvm. I was running ext3 but removed the journal flag with thor:~# tune2fs -O ^has_journal

The quilt patch titled Subject: ocfs2: fix non-auto defrag path not working issue has been removed from the -mm tree. Its filename was ocfs2-fix-non-auto-defrag-path-not-working-issue.patch This patch was dropped because it was merged into the mm-hotfixes-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From:

When designing a filesystem, is fragmentation really an issue if access to the disk can be done using scatter-gather DMA techics ?