Tomasz Torcz <[email protected]> wrote:
> On Thu, Aug 03, 2006 at 07:25:19PM -0400, Russell Leighton wrote:
> >
> > If the software (filesystem like ZFS or database like Berkeley DB)
> > finds a mismatch for a checksum on a block read, then what?
> >
> > Is there a recovery mechanism, or do you just be happy you know there is
> > a problem (and go to backup)?
>
> ZFS readsthis block again from different mirror, and if checksum is
> right -- returns good data to userspace and rewrites failed block with
> good data.
>
> Note, that there could be multiple mirrors, either physically (like
> RAID1) or logically (blocks could be mirrored on different areas of the
> same disk; some files can be protected with multiple mirrors, some left
> unprotected without mirrors).
Murphy's law will ensure that the important files are unprotected. And the
1st Law of Disk Drives (they are always full) will ensure that there are no
mirrored pieces anyway...
--
Dr. Horst H. von Brand User #22616 counter.li.org
Departamento de Informatica Fono: +56 32 654431
Universidad Tecnica Federico Santa Maria +56 32 654239
Casilla 110-V, Valparaiso, Chile Fax: +56 32 797513
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
