Re: KVM on top of BTRFS

[Ernst Sjöstrand]

Hi,

you can't beat the benchmarks that Serge Hallyn did, really thorough!

http://s3hh.wordpress.com/2012/05/02/first-round-of-kvm-performance-tests/

Regards
//Ernst

2012/6/12 steamraven steamra...@yahoo.com:

 Seems a little unfair on btrfs to just to look at absolutes in this context.
 Prior reports said that the fs ground to a halt,
 it isn't doing that by any stretch.


 I agree.  What I am mostly looking for is the best setup
 for using KVM snapshots:

 KVM qcow2 on top of something like ext4  or
 raw on top of btrfs



 I haven't let any of these installs complete and used it as intended.
 So that's what I intend to do next; after all one doesn't install every day.


 I am going to try to benchmark a couple variations and flags
 qcow2 on ext4  (noatime)
 raw on btrfs (defaults)
 raw on btrfs (noatime,space_cache)
 raw on btrfs (noatime,nospace_cache)
 raw on btrfs (noatime,nodatacow)

 Any other options that might be good to try?


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Re: New btrfsck status

[Ernst Sjöstrand]

A very good question indeed! ;-)

Regards
//Ernst Sjöstrand

On Tue, Mar 29, 2011 at 14:13, Thomas Backlund t...@mandriva.org wrote:
 Chris Mason skrev 10.2.2011 14:17:

 Excerpts from Ben Gamari's message of 2011-02-09 21:52:20 -0500:

 Hey all,

 Over the last several months there have been many claims regarding the
 release of the rewritten btrfsck. Unfortunately, despite numerous
 claims that it will be released Real Soon Now(c), I have yet to see
 even a repository with preliminary code. Did I miss an announcement?
 There is something to be said for release early, release often. Is
 there a timeline for getting btrfsck into some sort of usable form?

 Yes, but its still real soon now.  I've been at about 90% done since
 Christmas.  It would have been out last week but I've been chasing a
 debugging a very difficult corruption under load.

 I finally found a race in btrfs causing the corruption and now I'm back
 on fsck full time again.


 Any status updates on this ?

 Checking:
 http://git.kernel.org/?p=linux/kernel/git/mason/btrfs-progs-unstable.git;a=shortlog;h=refs/heads/next

 I see last commit is 3+ months ago

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 Thomas
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