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zxy
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 Posted: Fri Jun 29, 2007 10:09 am Post subject: |
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Though, the compression would be a cool feature. Is it planned/possible?
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frenkel
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| Posted: Fri Jun 29, 2007 10:10 am Post subject: |
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Yeah, I know ZFS has compression. I think it's not the main focus of the developers to be a ZFS competitior, it's more that they wanted a good COW (copy-on-write) filesystem for Linux, with the ability to create snapshots and checksumming of every block. Maybe in the future, when it has become more mature, they will implement compression.
I just wrote the btrfs-devel mailing list, lets see what the developer have to say... |
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kernelOfTruth
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frenkel
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| Posted: Fri Jun 29, 2007 10:49 am Post subject: |
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| kernelOfTruth wrote: | just found out that it isn't as efficient as jfs & reiserfs
http://forums.gentoo.org/viewtopic-p-4118224.html#4118224
it uses 20-30 MBs more than reiserfs on the portage partition (only tested reiserfs, didn't want to wait on jfs, it takes generally some time longer to write & read),
do you think this can still be improved or is this part of development already finished ? |
I don't know, but I do know, that reiserfs doesn't have checksums and that it isn't COW, that stuff takes up space also. For example, the checksums take 32byte per block. |
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ToeiRei
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| Posted: Fri Jun 29, 2007 11:32 am Post subject: |
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To get back on topic: are there some ebuilds available for btrfs and btrfs-progs?
Just moved my portage to btrfs to have some real world results. All I can say is *gasp*
Rei
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Last edited by ToeiRei on Fri Jun 29, 2007 11:50 am; edited 1 time in total |
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frenkel
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| Posted: Fri Jun 29, 2007 11:47 am Post subject: |
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| ToeiRei wrote: | To get back on topic: are there some ebuilds available for btrfs and btrfs-progs?
Rei |
Not yet, I'll make some today. |
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frenkel
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| Posted: Fri Jun 29, 2007 12:26 pm Post subject: |
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| frenkel wrote: | | ToeiRei wrote: | To get back on topic: are there some ebuilds available for btrfs and btrfs-progs?
Rei |
Not yet, I'll make some today. |
They are finished. You can get them from svn using this command:
svn co http://lassie.no-ip.org/btrfs/ <location of local portage overlay>
After that, just run emerge -a btrfs and it will install everything you need!
Btw, the developer showed interest in compression  http://oss.oracle.com/pipermail/btrfs-devel/2007-June/000034.html
WARNING: Remember that this is still experimental and that the disk format may change during development!
Last edited by frenkel on Fri Jun 29, 2007 1:17 pm; edited 1 time in total |
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ToeiRei
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| Posted: Fri Jun 29, 2007 12:44 pm Post subject: |
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great, frenkel - thanks!
Here are some timings of my system doing an emerge --sync from a local mirror (LAN, 100 MBit) to an empty partition
JFS:
| Code: | real 5m14.770s
user 0m23.996s
sys 0m16.572s |
BTRFS:
| Code: | real 3m49.666s
user 0m21.163s
sys 0m20.111s |
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ToeiRei
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| Posted: Wed Jul 04, 2007 2:42 pm Post subject: |
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Update:
btrfs on top of LVM:
| Quote: | real 4m27.315s
user 0m21.232s
sys 0m18.941s
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frenkel
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| Posted: Wed Jul 04, 2007 2:50 pm Post subject: |
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| ToeiRei wrote: | Update:
btrfs on top of LVM:
| Quote: | real 4m27.315s
user 0m21.232s
sys 0m18.941s
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LVM slows your system down significantly if you resize and move your partitions a lot. You get fragmentation all over the place. On a desktop I don't find it useful. On a server I found it useful, to make snapshots for example, but if btrfs matures, I won't need it on servers either. |
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ToeiRei
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| Posted: Wed Jul 04, 2007 2:57 pm Post subject: |
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I just moved my system for being able to resize partitions easily. So I just times btrfs for you to see how it plays with lvm...
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zxy
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| Posted: Wed Jul 04, 2007 8:48 pm Post subject: |
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I hope it will be done, as I really liked the reiser4's idea with plugins.
Reading the ^^^ link made me remember: Different people, different needs.
That's why i guess different plugins would be a cool feature. Maybe even various encription plugins and various compression plugins (like gzip, bzip2, lzo ...)
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ToeiRei
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| Posted: Mon Jul 09, 2007 12:55 pm Post subject: |
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Hello folks,
Could someone please confirm that the btrfs module does NOT load with the gentoo-sources 2.6.21-r4 and newest headers?
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ToeiRei
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| Posted: Tue Jul 10, 2007 11:17 am Post subject: |
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Upgraded to kernel 2.6.22 and rebuilt the module (still at the old kernel). No success on getting that bugger to work. After all I rebooted using the new kernel and emerged the btrfs module again. Found the hint there.
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kernelOfTruth
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aidanjt
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| Posted: Sat Jul 28, 2007 1:40 am Post subject: |
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Is it really a good idea to use an 'alpha' FS on your system?
That aside, what's with this 'everything but kitchen sink" file systems these days?.. we already have lvm and device mapper subsystems in the kernel that *are* stable.
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kernelOfTruth
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| Posted: Sat Jul 28, 2007 2:19 am Post subject: |
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| Quote: | | Though, the compression would be a cool feature. Is it planned/possible? |
it is  !
| AidanJT wrote: | Is it really a good idea to use an 'alpha' FS on your system?
That aside, what's with this 'everything but kitchen sink" file systems these days?.. we already have lvm and device mapper subsystems in the kernel that *are* stable. |
so what ? 
does *stable* imply:
- they are fast
- they are efficient in terms of space usage
- they do checks on file (integrity)
- they offer compression
- they offer snaphosts
- the are zfs-like filesystems
? 
don't forget: opensource / F/OSS, especially GNU/Gentoo is about choice
and each and every fs has it's right to exists since it serves a specific purpose
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aidanjt
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| Posted: Sat Jul 28, 2007 11:07 am Post subject: |
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| kernelOfTruth wrote: |
| AidanJT wrote: | Is it really a good idea to use an 'alpha' FS on your system?
That aside, what's with this 'everything but kitchen sink" file systems these days?.. we already have lvm and device mapper subsystems in the kernel that *are* stable. |
does *stable* imply:
- they are fast
- they are efficient in terms of space usage
- they do checks on file (integrity)
- they offer compression
- they offer snaphosts
- the are zfs-like filesystems
?
don't forget: opensource / F/OSS, especially GNU/Gentoo is about choice
and each and every fs has it's right to exists since it serves a specific purpose |
- yes
- depends on FS (where it should be)
- yes (also depends on FS)
- yes
- yes
- no, like I said, a FS isn't the place for volume management features
Well that's fair enough, developers can choose to design things whatever way they wish, but it flys in the face of decades of UNIX development, design something to do one job, and do it very well, we've all seen how designing one thing to do everything works in windows.
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kernelOfTruth
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| Posted: Sat Jul 28, 2007 11:09 am Post subject: |
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| Quote: | | design something to do one job, |
in theory yes, but there will always be cases in which the filesystem can't cope with files as it should - for this there's a choice
| Quote: | | we've all seen how designing one thing to do everything works in windows. |
yes, sort of, but if you can make it better, why not
ntfs' log replay also isn't that fast compared to ext3 or reiserfs as far as I know & it's space-usage also could be improved, if btrfs can manage to do these things all faster & better while maintaining even increased data integrity (see checksums) it surely would be used on lots of boxes
it probably could also replace the ext*-family as "default" recommended filesystem but that's still a long way ahead ....
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ToeiRei
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| Posted: Tue Aug 07, 2007 12:42 pm Post subject: |
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any news from the btrfs front?
Rei
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ToeiRei
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| Posted: Wed Aug 08, 2007 10:22 am Post subject: |
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There's a new version out - 0.6;
As far as I can see from the SVN Changelog it's mostly bugfixes and cleanups and API Changes.
Rei
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kernelOfTruth
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ToeiRei
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| Posted: Wed Aug 08, 2007 12:17 pm Post subject: |
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It has never been said that there's no fragmentation problem on *nix FS...
even XFS got defrag stuff...
Got the new 0.6 version online here by bumping frenkels' ebuilds. Everything works file here - or at least pretends to do so.
Rei
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kernelOfTruth
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ToeiRei
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| Posted: Wed Aug 08, 2007 2:09 pm Post subject: |
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Agreed. I am following the changes from svn as fs development is quite an interesting topic
Things I would love to see are the fs-is-full-event implementaion (still an open bug) and something like quotas on slices (or how you would call those directories to store files in on that system)
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