On Apr 21 2016, Chris Davies <[email protected]> wrote:
> Hello,
>
> I'm using S3QL with OVH Cloud Storage (no, that's not Hubic) and it's 
> working mostly very nicely, thank you. This is running S3QL from Debian 
> unstable (version "2.17.1+hg2+dfsg-3").
>
> Unfortunately I'm getting around two or three filesystem crashes each day. 
> strace shows the python process stuck on a futex (I can't help you more 
> than that without some hand-holding, sorry) and the only solution is to 
> kill the process and run fsck.s3ql. It's possibly due to the amount of data 
> I'm writing to the store
>
> Directory entries:    6017319
> Inodes:               5991966
> Data blocks:          761943
> Total data size:      4.79 TB
> After de-duplication: 1.12 TB (23.38% of total)
> After compression:    972 GiB (19.81% of total, 84.75% of de-duplicated)
> Database size:        944 MiB (uncompressed)
> Cache size:           10.00 GiB, 1030 entries
> Cache size (dirty):   10.00 GiB, 1030 entries
>
> I only mount the S3QL filesystem from one client.
>
> Given that I want to remount the filesystem as soon as the fsck has 
> completed, is there any sense or possibility in being able to avoid the 
> "committing block..." section of the fsck process? This could leave the 
> blocks marked as dirty cache and these could be swept up at a later
> time
[...]

People never cease to amaze me. You really want to invest your time in
making fsck.s3ql run faster, and live with periodic crashes/hangs?

Well, that's certainly up to you. I, however, will only spend my time on
trying to fix the underlying bug, which I consider a much more fruitful
endeavor. If you want to help me, please follow the instructions on
https://bitbucket.org/nikratio/s3ql/wiki/Providing%20Debugging%20Info. If
you could create a backtrace at the time the mount.s3ql process hangs,
that would be very helpful.


Best,
-Nikolaus

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