Re: [bcachefs] problem with `bcache fsck`

[Marcin <marcin@mejor.pl>]

W dniu 2017-03-16 21:34, Kent Overstreet napisał(a):
> On Thu, Mar 16, 2017 at 04:16:29PM +0100, Marcin wrote:
>> Hi!
>> It's good to hear that silence on mailinglist doesn't mean that there 
>> is no
>> changes in developing bcachefs!
> 
> Join the irc channel! It's pretty active.

Done.


>> Is bcache fsck able to do fsck on tiered devices?
> 
> Yes - just pass it all the devices, e.g.
> bcache fsck /dev/sdb /dev/sdc
> 
> Also, keep in mind fsck is still run by default at mount time, there's 
> normally
> no need to use userspace fsck (and running fsck in userspace and then 
> mounting
> will be slower than just mounting and running fsck then, due to mount 
> still
> having to scan all the metadata which will be cache cold).

If I add bcachefs to fstab openrc expects userland fsck to works this is 
why I tried it to use.

>> I know that there is some stability problem with tiered devices 
>> because when
>> I mounted tiered fs and started to copy files on it the host rebooted 
>> after
>> some time. I have to run netconsole to catch what kernel says, then I 
>> post
>> it on ML.
> 
> You might have been hitting a bug in a recent patch to improve 
> readpages
> performance - I backed it out last night after I discovered it.

There is no new commit, I'm at
commit 7274700edcf99ab67d4f72eca4f07d0220b9abae
Author: Kent Overstreet <kent.overstreet@gmail.com>
Date:   Tue Mar 14 21:07:39 2017 -0800

     bcache: fix device hot add


I suspect that problem is due to using  --metadata_replicas=2. If you 
have a some spare time please try fileystsem formated with this 
parameters:
# bcache format --compression_type=gzip --metadata_replicas=2 
--data_checksum_type=crc64 --metadata_checksum_type=crc64 --tier=2 
/dev/sde1 --tier=3 /dev/sdd1



>> And I'm still missing compression saves free space on disk:)
> 
> Yeah, that's something I've been wanting to get to, but people have 
> been
> badgering me for replication more :)

You have implemented too many features, everyone find something usefull 
for self and want to have it. You should implement only writing and 
reading to/from files;)

Btw:
# curl https://evilpiepirate.org/git/bcache-tools.git/
curl: (51) SSL: no alternative certificate subject name matches target 
host name 'evilpiepirate.org'


Marcin