What filesystem for ssd? (f15)

[Karol Babioch]

Hi,

Am 11.04.2011 16:26, schrieb Neal Becker:
> What filesystem should I use?  Go for btrfs?

I would recommend ext4 as btrfs still isn't marked as stable. Although
there are no bigger bugs to be expected anymore I would trust it in an
production environment. Furthermore it will be possible to convert ext4
into btrfs without bigger problems.

I'm also using ext4 on top of an encrypted lvm setup. Unfortunately
dm-crypt doesn't have the discard feature implemented yet, so the trim
feature of my SSD doesn't get utilized :(.

However encryption is the only way to make sure to give no sensible
information away when selling the drive later on, because you have no
clue what the controller is actually doing ;). As some flash cells will
get replaced automatically during the lifetime of your drive you can't
make sure that they are also properly deleted.

Some models offer the possibility to reset the whole drive using ATA
commands, but once again you have to trust the manufacturer to have done
everything right.

Another important thing is to mount your partitions with the "noatime"
parameter when you don't depend on it. In order to update these few bits
the SSD will erase whole groups of cells for each file (when there is no
buffer involved) so you can shorten the expected lifetime easily by a
huge factor ;).

Best regards,
Karol Babioch

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