On Jan 1, 2010, at 04:33, Ragnar Sundblad wrote:
I see the possible win that you could always use all the working
blocks on the disk, and when blocks goes bad your disk will shrink.
I am not sure that is really what people expect, though. Apart from
that, I am not sure what the gain would be.
Could you elaborate on why this would be called for?
Currently you have SSDs that look like disks, but under certain
circumstances the OS / FS know that it isn't rotating rust--in which
case the TRIM command is then used by the OS to help the SSD's
allocation algorithm(s).
If the file system is COW, and knows about SSDs via TRIM, why not just
skip the middle-man and tell the SSD "I'll take care of managing
blocks".
In the ZFS case, I think it's a logical extension of how RAID is
handling: ZFS' system is much more helpful in most case that
hardware- / firmware-based RAID, so it's generally best just to expose
the underlying hardware to ZFS. In the same way ZFS already does COW,
so why bother with the SSD's firmware doing it when giving extra
knowledge to ZFS could be more useful?
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
