>Bullshit. I just got a OCZ Vertex 3, and the first fill was 450-500MB/s. >Second and sequent fills are at half that speed. I'm quite confident >that it's due to the flash erase cycle that's needed, and if stuff can >be TRIM:ed (and thus flash erased as well), speed would be regained. >Overwriting an previously used block requires a flash erase, and if that >can be done in the background when the timing is not critical instead of >just before you can actually write the block you want, performance will >increase.
I think TRIM is needed both for flash (for speed) and for thin provisioning; ZFS will dirty all of the volume even though only a small part of the volume is used at any particular time. That makes ZFS more or less unusable with thin provisioning; support for TRIM would fix that if the underlying volume management supports TRIM. Casper _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
