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putting /usr/portage into its own BTRFS file
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toralf
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Location: Hamburg/Germany

PostPosted: Sun Feb 16, 2014 10:47 am    Post subject: putting /usr/portage into its own BTRFS file Reply with quote

Inspired by http://blogs.gentoo.org/mgorny/2014/02/06/using-deltas-to-speed-up-squashfs-updates/ I created a 1.5 GB file /var/lib/portage.fs
Code:
dd if=/dev/zero of=/var/lib/portage.fs bs=1024 count=1500K
mkfs.btrfs /var/lib/portage.fs
with BTRFS and moved all directories of /usr/portage/* into it. Before I moved ./distfiles out to /var/lib and symlinked it back afterwards:
Code:
mv /usr/portage/distfiles /var/lib/ && ln -s /var/lib/distfiles /usr/portage/
With the following entry in /etc/fstab :
Code:
/var/lib/portage.fs /usr/portage btrfs auto,noatime,compress=lzo
the portage directory is mounted automatically.

Advantage: a huge speed up in the rsync process for my very slow external hard disk.
Update: added used commands/Update


Last edited by toralf on Mon Feb 17, 2014 9:31 pm; edited 2 times in total
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dambacher
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Joined: 11 Feb 2003
Posts: 282
Location: Germany

PostPosted: Sun Feb 16, 2014 1:27 pm    Post subject: Reply with quote

I put everything about portage and layman to /pkg
wich is on an extra subvolume.
And I removed everything from the the original places, without leaving links and set in make.conf:
Code:
# install my portage and layman files to /pkg
PORTDIR="/pkg/portage"
DISTDIR="/pkg/distfiles"
PKGDIR="/pkg/packages"

PORTDIR_OVERLAY="
/pkg/overlays/gentoo-ulda
$PORTDIR_OVERLAY
"
source /pkg/layman/make.conf

and layman.conf:
Code:
storage   : /pkg/layman
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kernelOfTruth
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Joined: 20 Dec 2005
Posts: 5727
Location: Vienna, Austria; Germany; hello world :)

PostPosted: Mon Feb 17, 2014 4:51 pm    Post subject: Reply with quote

*subscribed*

this is probably even better than using a separate partition for it


thanks !
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Hardcore Linux user since 2004 :D
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toralf
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PostPosted: Mon Feb 17, 2014 8:02 pm    Post subject: Reply with quote

FWIW it is important to mount the BTRFS file with option compres=... before you move the data. Then the effect of the compression is maximal as seen here :
Code:
# df -m
Filesystem     1M-blocks  Used Available Use% Mounted on
...
/dev/loop1           400    63       334  16% /var/db/pkg
/dev/loop0          1500   571       736  44% /usr/portage

# du -ms /usr/portage/
724     /usr/portage/

# du -ms /var/db/pkg
182     /var/db/pkg

And of course /var/tmp/portage is on a tmpfs :
Code:
# grep /var/tmp/portage /etc/fstab
tmpfs                   /var/tmp/portage        tmpfs   auto,noatime,size=4G
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John R. Graham
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Joined: 08 Mar 2005
Posts: 7841
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PostPosted: Mon Feb 17, 2014 9:21 pm    Post subject: Reply with quote

Moved from Installing Gentoo to Documentation, Tips & Tricks. I think this is worthy of preserving where it won't get lost in the chaff. Might even deserve a sticky. :)

- John
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