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Re: Advice about ext3, please

On Tue, Mar 10, 2009 at 6:10 AM, lists <list@fiwwi.com> wrote:
> On Mon, 2009-03-09 at 09:10 +0000, Nuno Magalhães wrote:
>> On Mon, Mar 9, 2009 at 05:15, Steven Demetrius
>> <steven.demetrius@fiwwi.com> wrote:
>> > Does anyone here power off their computer without first shutting it down?
>> > Maybe, but after having to spend time repairing the system and/or rebuilding
>> > it or losing data they most likely don't anymore.
>> Power outages still occur.
>> I was under the impression ext3 was the Good Thing™ and ext4 is the
>> future, but with all the counter-claims i got curious. If uptime is
>> important you'll want ext3 over ext2 (not this case i guess), if data
>> loss is important (if?) i think the journal helps... And lately disk
>> capacity is less and less a problem, so why not ext3? Btw, how does
>> one know how much space is the journal using?
>> Nuno Magalhães
>> LU#484677
> The discussion is about removable USB HD used for data backup or data
> transfer and whether to use ext2 or ext3 file system.

I'm surprised nobody has mentioned UDF yet. R/W support in most OSes,
including recent versions of Windows. R/O support in Windows since 98 I
think. It looks like a reasonable choice if the ability to be read
outside of Linux is at all important. (I mention Windows specifically
because it has the most limited FS support of any major OS.)

> Replying to and quoting only the above paragraph takes it out of
> contexts and changes its meaning.
> The solutions to power outage is to buy and install a UPS.

That's not a realistic answer. A decent UPS is likely to cost as much as
the computer.

> To find out how much space is used you can look up the ext3
> specification and do the calculations or format the drive with both ext2
> and ext3 then note the difference in space left.

Or you could use '/sbin/debugfs -R "stat <8>" /dev/sda1'
(substituting the correct device name for sda1 obviously), and check the
size value (in bytes) on the third line.


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