Dovecot + sis problem

[Michał Kiljański]

Ok, thanks.
But :)
What is strange for me is disk usage.

du -s -h /var/mail/attachments/8b/67/

16M     /var/mail/attachments/8b/67/

check indes
ls -i /var/mail/attachments/8b/67/
662975
8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-28571b018ff2f45f0c700000035f3f08
662974
8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-50315d3a8ef2f45f0a700000035f3f08
662973
8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-586cdb378ef2f45f07700000035f3f08

 ls -i /var/mail/attachments/8b/67/hashes/
662974
8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258

Is this correct?
As I read about hard link - links should point to the same inode, each link.

So how to get real disk usage for the folder with attachments?





śr., 6 sty 2021 o 10:43 Patrick Cernko <pcernko at mpi-klsb.mpg.de> napisał(a):

> Hi Michal,
>
> On 06.01.21 00:18, Michał Kiljański wrote:
> > Hi,
> > My setup is:
> > mail_attachment_dir = /var/mail/attachments
> > mail_attachment_hash = %{sha512}
> > mail_attachment_min_size = 64k
> > mail_attachment_fs = sis posix
> >
> > Something works - but I expected that is one instance of file, and this
> > file is linked to messages. But here in folder I have got this:
> >
> > sudo ls -la /var/mail/attachments/8b/67/
> >
> > -rw-rw-rw- 3 buser dovecot 5425280 Jan  5 23:13
> >
> 8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-0258913a92f2f45f0d700000035f3f08
> > -rw-rw-rw- 1 cuser dovecot 5425280 Jan  5 23:13
> >
> 8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-28571b018ff2f45f0c700000035f3f08
> > -rw-rw-rw- 3 buser dovecot 5425280 Jan  5 23:13
> >
> 8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-50315d3a8ef2f45f0a700000035f3f08
> > -rw-rw-rw- 1 auser dovecot 5425280 Jan  5 23:13
> >
> 8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258-586cdb378ef2f45f07700000035f3f08
> > drwxrwsrwx 2 buser dovecot    4096 Jan  5 23:13 hashes
> >
> > sudo ls -la /var/mail/attachments/8b/67/hashes/
> >
> > -rw-rw-rw- 3 buser dovecot 5425280 Jan  5 23:13
> >
> 8b67b29a73b74ecf48e17e789051602cec13aa78cc01c06c8eee1ca4be7c8e07f700cdc9e9ca0381fa3541bdd4e26289de1d7eee763233dfaa0a200a264e5258
> >
> >
> > What is wrog? How to setup SIS to get one instance of file?
>
> SIS uses hard links. In your example the attachment in 8b/67/hashes/ is
> referenced in 2 other files (aka attached in 2 mails) in the 8b/67/
> directory. So the data is stored only once on disk but referenced in 3
> directory entries. You can see the refcount in column 3 of ls -l.
>
> Best,
> --
> Patrick Cernko <pcernko at mpi-klsb.mpg.de> +49 681 9325 5815
> Joint Administration: Information Services and Technology
> Max-Planck-Institute für Informatik & Softwaresysteme
>
>
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