On 21.05.2011 01:05, Miguel Garrido wrote:
> On Fri, May 20, 2011 at 12:35 PM, Tomasz Chmielewski<mangoo@xxxxxxxx> wrote:
>>
>> Nobody has a clue what makes btrfs run out of space when used with PostgreSQL, even when there is plenty of free space left?
>>
>>
>> # df -h
>> Filesystem Size Used Avail Use% Mounted on
>> /dev/sdb4 336G 257G 78G 77% /mnt/btrfs
>>
>>
>> coredb=# DELETE FROM core_trevent where "date"< E'2011-05-07 00:00';
>> ERROR: could not write block 1014999 of relation base/16384/16521: No space left on device
>> CONTEXT: writing block 1014999 of relation base/16384/16521
Just a follow up - I'm able to reproduce the issue with 3.0.1 kernel, with plain rsync.
I'm trying to write a ~ 4 GB file to btrfs.
"Fast" writes will make btrfs output "No space left on device".
On the other hand, if I write slowly, btrfs will be happy and write the whole file.
cp ("full speed copy") fails after a few seconds, so let's try to write with ~5 MB/s - still fails:
# rsync -a -v --progress --bwlimit=5000 . /mnt/btrfs/temp
sending incremental file list
./
randomfile
645136384 13% 4.87MB/s 0:13:32
rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32)
rsync: write failed on "/mnt/btrfs/temp/randomfile": No space left on device (28)
rsync error: error in file IO (code 11) at receiver.c(302) [receiver=3.0.7]
rsync: connection unexpectedly closed (31 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at io.c(601) [sender=3.0.7]
Let's write with ~1 MB/s then - succeeds:
# rsync -a -v --progress --bwlimit=1000 . /mnt/btrfs/temp
sending incremental file list
./
randomfile
4693411469 100% 988.30kB/s 1:17:17 (xfer#1, to-check=6/8)
(...)
sent 4758749321 bytes received 112 bytes 1012176.84 bytes/sec
total size is 4758167972 speedup is 1.00
I don't think it's expected?
I see these in dmesg while copying the files:
[ 1703.978600] btrfs: free space inode generation (0) did not match free space cache generation (22496)
[ 1703.978605] btrfs: failed to load free space cache for block group 92371156992
[ 1704.026476] btrfs: free space inode generation (0) did not match free space cache generation (22502)
[ 1704.026481] btrfs: failed to load free space cache for block group 114919735296
[ 1704.035239] btrfs: free space inode generation (0) did not match free space cache generation (22503)
[ 1704.035243] btrfs: failed to load free space cache for block group 118140960768
[ 1704.035252] btrfs: free space inode generation (0) did not match free space cache generation (22481)
[ 1704.035255] btrfs: failed to load free space cache for block group 119214702592
[ 1704.294757] btrfs: free space inode generation (0) did not match free space cache generation (22503)
[ 1704.294761] btrfs: failed to load free space cache for block group 243231883264
--
Tomasz Chmielewski
http://wpkg.org
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