[prev in list] [next in list] [prev in thread] [next in thread] 

List:       opensuse
Subject:    Strange or unexpected disk activity after issuing "sync".
From:       "Carlos E. R." <robin.listas () telefonica ! net>
Date:       2021-03-16 12:42:36
Message-ID: 1278f5ce-4c9-127b-4342-e4116c4ea6b7 () telefonica ! net
[Download RAW message or body]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1


Hi,

Doing experiments while investigating a problem, I noticed that the 
command "sync", which flushes disk caches from memory to disk, took long 
(minutes?) to sync. But wait.

I also noticed looking at "atop", that one disk, and one disk only of the 
five I have, goes 100% busy at that point (sdc)

And then I noticed, running gkrellm with one chart per partition of that 
disk that it is only one partition which is writing a lot of stuff, slowly 
at about 250 KBps, for a time that can be half a minute or probably 
minutes (I'm still investigating).

What is that partition?

Well, for one thing it is the only reiserfs partition I still have:

fstab entries:
LABEL=c_data_reiser                /data/Lareiserfs    reiserfs   \
                acl,user_xattr,barrier=flush,lazytime   1 3
/data/Lareiserfs/var_spool_news    /var/spool/news     none       bind    0 0

And for another, it contains "/var/spool/news", which is used by my nntp 
news proxy "leafnode".

My guess is that the partition delays writing of stuff to the disk for 
perhaps hours. The news store contains more than a million of small files 
in 3 GiB, one file per message. And very scattered.


Could "lazytime" be involved in this behavior?



- -- 
Cheers

 	Carlos E. R.
 	(from 15.2 x86_64 at Telcontar)


-----BEGIN PGP SIGNATURE-----

iHoEARECADoWIQQZEb51mJKK1KpcU/W1MxgcbY1H1QUCYFCnvBwccm9iaW4ubGlz
dGFzQHRlbGVmb25pY2EubmV0AAoJELUzGBxtjUfVGfAAoICgtJ9AfaTRmxFq5Vjb
RcNnQg6qAJwNQMHLPGWeljXlIECpjR3qfxCe5w==
=VJ0e
-----END PGP SIGNATURE-----


[prev in list] [next in list] [prev in thread] [next in thread]