Re: Advice about ext3, please
Steven Demetrius wrote:
Paul E Condon wrote:
I'd like some confirmation, or refutation, of some reasoning:
I have a USB external hard drive. It came with vfat fs, but I want to
write an ext2/3 fs on it. All my internal HD are ext3, but should this
one be ext3, also? Doesn't ext3 essentially write everything twice,
first to the journal, and then to the actual target location? This is
OK with an internal bus interface from the CPU to the HD, but USB is
not so fast. So I think I should not use ext3 for this HD. Is this
Basically ext3 is ext2 with Journaling. Journaling basically safe-guards
against power failure and system crashes. It is well suited for system
partitions and partitions that are being used most of the time your
computer is on.
Journaling uses significantly more disk space and does not allow for
deleted file recovery. IT uses more resources that ext2. Journaling does
not write everything twice. It keeps track of the file system which
makes recovery fast and more reliable than file systems without Journaling.
I recommend the following:
ext3 - for system partitions and data partitions which are in use most
of the time (/, /home, /var, etc. if they are separate partitions or
ext2 - for backup, removable, partitions rarely used, etc.
If your USB external is for backup or file transfers then I recommend
using the ext2 file system on it. Logic being that if your USB external
data gets corrupted then you still have a copy of the data on another
Some people confuse backup with archiving. They will make copies of
their data and store it away until they have data problems with the
system. This is archiving.
Backup is a never ending routine whether done once a week or one a month
and also include regular data integrity checks of the backups.
Journaling file system does write data twice.