Am 13.03.2013, 12:31 Uhr, schrieb Swâmi Petaramesh <sw...@petaramesh.org>:
Le 13/03/2013 11:56, Bart Noordervliet a écrit :
USB flash drives are rubbish for any filesystem except FAT32 and then
still only gracefully accept large sequential writes. A few years ago
I thought it would be a good idea to put the root partition of a few
of my small Debian servers on USB flash, so that the harddisks could
spin down at night and I could easily prepare and switch a new
Debian-version. However, each and every USB stick got trashed within a
year
I have an ARM box that runs a little Debian server (typically an
advanced NAS), it uses an USB key as an ext2 root filesystem. Everything
but big storage is there, and it's been up and running 24/7 for 3+ years
without any USB key incident...
The difference is the fs. Ext3 uses a journal which uses always the same
physical sectors on disc. If the disc is a hard disk, it does not matter,
rewrites are no problem for platters. If it is an modern SSD, the SSD-
controller takes care and redirects the writes to different physical
sectors. USB-sticks have no smart controller and so the writes hit
always the same physical sector, it's like burning a hole in the flash
chip. If the commit time is standard for desktops set to 5 seconds, then
a whole year means a lot of writes to the same sector on an USB-stick.
Regards
Norbert
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