> From: Richard Elling [mailto:rich...@nexenta.com] > > > Suppose you want to ensure at least 99% efficiency of the drive. At > most 1% > > time wasted by seeking. > > This is practically impossible on a HDD. If you need this, use SSD.
Lately, Richard, you're saying some of the craziest illogical things I've ever heard, about fragmentation and/or raid. It is absolutely not difficult to avoid fragmentation on a spindle drive, at the level I described. Just keep plenty of empty space in your drive, and you won't have a fragmentation problem. (Except as required by COW.) How on earth do you conclude this is "practically impossible?" For example, if you start with an empty drive, and you write a large amount of data to it, you will have no fragmentation. (At least, no significant fragmentation; you may get a little bit based on random factors.) As life goes on, as long as you keep plenty of empty space on the drive, there's never any reason for anything to become significantly fragmented. Again, except for COW. It is known that COW will cause fragmentation if you write randomly in the middle of a file that is protected by snapshots. _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
