Re: Reiser4. BEST FILESYSTEM EVER.

On Fri, 06 Apr 2007 19:47:36 PDT, johnrobertbanks@xxxxxxxxxxx said:
On Fri, 6 Apr 2007 11:21:19 -0400, "Jan Harkes" <jaharkes@xxxxxxxxxx>

With compression there is a pretty high probability that one corrupted
byte or disk block will result in loss of a considerably larger amount
of data.

Bad blocks are NOT dealt with by the filesystem,... so your comment is
irrelevant, or just plain wrong.

If your filesystem is writing to bad blocks, then throw away your
operating system.

You know... occasionally, blocks go bad *after* you write to them. If
you have an uncompressed filesystem, it's often possible to recover most
of the file , and just have a few 512-byte blocks of zeros, simply by
doing something like 'dd if=bad.file of=bad.file bs=512 conv=noerror'
or careful applications of 'skip=N'. If it's compressed, you usually
can't recover the rest of a compression group if a previous block is lost.

(And for those who talk about backups - yes, taking backups is good.
However, it's the rare laptop or desktop machine that can afford the
luxury of RAID disks, and backups usually happen once a night, if that
often. This means that if you've been working hard on something important
all day, and the disk blows chunks at 4:30PM, you *will* be suddenly very
concerned over exactly how much you can recover off the failing drive....

And yes, I'd *love* to have all my users connected to nice SAN systems that do
snapshotting and remote replication to DR sites and all that - but have you
ever *priced* a petabyte of SAN storage, the NAS gateways to serve it to users,
and upgrading several tens of thousands of network ports to Gig-E? Hint -
US$1M would get us through a pilot, and probably $5M and up to *start*
deployment. Anybody wanna buy us an EMC DMX-3? :)

http://www.emc.com/products/systems/symmetrix/DMX_series/DMX3.jsp

Attachment: pgpt5CSWxU6G7.pgp
Description: PGP signature

Relevant Pages

  • Re: Backing up to hard disk - how large?
    ... > "Kevin Weilbacher" wrote in message ... >> As far as backups to recover a particular file, ... >> tape or disk backup! ... >>> several backups from successives days in case someone needs to ...
    (microsoft.public.backoffice.smallbiz2000)
  • Re: FAT32 or NTFS?
    ... >>10% wastage on 10 volumes is one whole hard disk wasted. ... >uncertainty about free space. ... Corrupt data can be better than none, ... "you can only recover part of the database". ...
    (microsoft.public.windowsxp.general)
  • RE: Dead hard drive
    ... Maybe you could recover ... That's a single FAT 32 active partition w/ XP Pro on it and it can access ... Here is a quick way to find if anything is left on your disk: ... to format the disk. ...
    (microsoft.public.windowsxp.general)
  • Re: Systems Registry data problem
    ... using a backup disk that I made a few weeks ago. ... There is still a problem with the Registry because I cannot run Registry ... Choose the most recent restore point and SR should restore the user ... How to Recover from a Corrupted Registry ...
    (microsoft.public.windowsxp.general)
  • Re: Systems Registry data problem
    ... I tried to use the memtest program but had great difficulty in copying to disk using Nero, and when it ran, it only seemed to carry out one sweep of the RAM and then seemed to go to sleep. ... There is still a problem with the Registry because I cannot run Registry Mechanic, which I have used in the past, or Regcure. ... Both of these programs stall part way through, the screen goes black and does not recover or give an error message. ... Choose the most recent restore point and SR should restore the user ...
    (microsoft.public.windowsxp.general)