[lkml]   [2006]   [Jul]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: ext4 features
Tomasz Torcz wrote:

>On Sat, Jul 01, 2006 at 07:47:16PM +0200, Thomas Glanzmann wrote:
>>>Checksums are not very useful for themselves. They are useful when we
>>>have other copy of data (think raid mirroring) so data can be
>>>reconstructed from working copy.
>>it would be possible to identify data corruption.
> Yes, but what good is identification? We could only return I/O error.
>Ability to fix corruption (like ZFS) is the real killer.

Having a checksum (or even a digital signature on a file) that lets us
detect corruption is very useful since, in many cases, it allows us to
flag the file as corrupt before it gets used.

In some cases, this is a big hint that you should restore it from backup
(tape, other disk, etc).

I think that it is a generally useful thing even when not on a self
correcting device,


To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-07-06 17:23    [from the cache]
©2003-2014 Jasper Spaans. hosted at Digital Ocean