On 28-Feb-07, at 6:43 PM, Erblichs wrote:
ZFS Group,
My two cents..
Currently, in my experience, it is a waste of time to try to
guarantee "exact" location of disk blocks with any FS.
? Sounds like you're confusing logical location with physical
location, throughout this post.
I'm sure Roch meant logical location.
--T
A simple reason exception is bad blocks, a neighboring block
will suffice.
Second, current disk controllers have logic that translates
and you can't be sure outside of the firmware where the
disk block actually is. Yes, I wrote code in this area before.
Third, some FSs, do a Read-Modify-Write, where the write is
NOT, NOT, NOT overwriting the original location of the read.
...
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
