Hello Ernesto! Ernesto Domato schrieb: > Well, I'd decided to reinstall my Eee 901 because the first time, I'd > used LVM to join the two internal SSD. The problem that I see with > this is that because of the slow write performance on the 16Gb disc, > sometimes the machines hangs for several seconds waiting for something > to finish. Maybe this is not related to LVM and the second disc, but > after reading the wiki article about the problem with Mozilla > (http://wiki.debian.org/DebianEeePC/TipsAndTricks#SpeedupsluggishIceweasel.2BAC8-Firefox3) > I thought that maybe some changes on the partitioning may help to the > situation.
My guess is, that long access times (on SSDs they can be up to 750 ms)
lead to the delays. Same here with a debian on second SSD, sometimes it
takes minutes to start an application.
> So, this is what I was thinking and will like to know your feedback:
>
> The 4Gb disc is the fastest at writing, so my idea is to create 2
> partitions. The first one will be 1Gb for /var since the system writes
> often here (for example, on /var/log) and the second will 3Gb for
> /home (I'll explain why this soon).
Maybe it would be good to reduce writing anyway, here are some tips of a
colleague (that I did not apply here yet):
- mount filesystem with "noatime"
- delay automatic sync
/etc/sysctl.conf:
vm.dirty_writeback_centisecs = 1500
- tune syslogd:
level 1:
do not sync each line:
in /etc/syslog.conf
target /log/file
->
target -/log/file
level 2:
do not log unnessesary things,
he keeps in /etc/syslog.conf:
kern.* -/var/log/kern.log
*.emerg -/var/log/syslog.log
level 3:
do not write to a file, but to a named pipe:
kern.* |/dev/xconsole
*.emerg |/dev/xconsole
read with:
xconsole -file /dev/xconsole
- delete /var/log/wtmp, /var/log/btmp and remove the lines from
/etc/logrotate.conf.
- mount /tmp, /var/run, Firefox-Cache in $HOME to tmpfs or Ramdisk.
Also there is a wiki entry about read only root:
http://wiki.debian.org/ReadonlyRoot
> Then, on the 16Gb create two more partitions. The first will be 4Gb
> for / and the second one will be 12Gb for /var/local/homes_data
>
> So, the idea of the 3Gb partition mounted on /home is to be used for
> all the dot-directory (the hidden ones) that use to be updated often
> by the programs you use to keep configuration changes and things like
> that (see the Mozilla problem that I point before). The rest (for
> example the Desktop directory) is linked to
> /var/local/homes_data/$USER for storage purpose.
sounds reasonable...
--
Martin
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