lkml.org 
[lkml]   [2000]   [Mar]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Is ReiserFS really a journaling file system, or is it really just a synchronous-metadata file system like BSD FFS?
Date
Scott Henry <scotth@sgi.com> wrote:
> You are thinking of the other type, a log-based filesystem, where
> metadata and user data are logged. It is much more difficult to

Maybe I am mixing up oranges and logs, but for me, in certain cases,
a log-based filesystem can be way faster than a normal or
metadata-log filesystem: as data is only appended, you can do
the append sequentially and in very big chunks (say, 4 MBytes
sequential I/Os). You will get very good performance from
single device and hardware (or even software) RAID0. And
you don't need to think about seek times when writing.

Of course, in theory this also means you have to add a new disk
drive every now and then, unless some data reclaimation is
done. Which brings in new problems.

This can of log file system (with data reclaimation) ressembles
a bit the HSM system when using tapes for data migration.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:57    [W:0.041 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site