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Old 10-01-2011, 06:03 PM   #16
nwrk
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Registered: Sep 2011
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Hello,

well... we have to conclude that BTRFS was the problem. I have the exact same thing in ext4 (just used another LV of the same size, rsync'ed the contents and reboot to start on a clean state). After a week SLAB usage is still very low :

Code:
 Active / Total Objects (% used)    : 253213 / 271645 (93.2%)
 Active / Total Slabs (% used)      : 8336 / 8336 (100.0%)
 Active / Total Caches (% used)     : 80 / 108 (74.1%)
 Active / Total Size (% used)       : 50127.81K / 55656.83K (90.1%)
 Minimum / Average / Maximum Object : 0.01K / 0.20K / 8.00K

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME                   
[...]
 19320  13456  69%    0.19K    920       21      3680K dentry
[...]
  1755   1555  88%    0.61K    135       13      1080K inode_cache
[...]
So well... I don't know how these people using BTRFS in production got it work, but my conclusion is : BTRFS is really not production ready, even read-only.

Thanks a lot for assistance, I usually solve my problems alone (on order to not bother people) but I must admit that being a part of the community is also a very nice feeling.

Have a nice week-end.

Last edited by nwrk; 10-01-2011 at 11:06 PM.
 
Old 10-01-2011, 09:55 PM   #17
syg00
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Maybe open a bug report - you have some comparative data to offer.
Where to post it might be an issu what with the problems at kernel.org

FWIW I use btrfs on all my non-prod systems, have for quite some time. Never seen this.
 
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Old 10-01-2011, 11:04 PM   #18
nwrk
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I think I'll build a similar setup in a VM. If I can help BTRFS to take one step forward production-readiness, I want to do that !

Syg, if you have a test system, maybe you could try -o compress=lzo to see if you come to the same problem

Last edited by nwrk; 10-01-2011 at 11:16 PM.
 
  


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