On Tue, Jul 14, 2015 at 05:48:13PM -0400 I heard the voice of kpn...@pobox.com, and lo! it spake thus: > > Who says that a write to a logical block in an SSD will result in a > write to the same physical block? I thought it would typically or at > least frequently go to a different physical block. Wear levelling > and all that.
Yes, it wouldn't be useful on a SSD (or a zvol, or any other backing that acts in a COW-ish way). And it's meaningless combining TRIM and shredding on a traditional platter drive, since it wouldn't do the TRIM part. Still, there can be some situations that would be both directly overwriting, and supporting unused-space-notifications; some virtualized SAN setups for instance, or or a md/VM/etc block device that supported sparse usage. -- Matthew Fuller (MF4839) | fulle...@over-yonder.net Systems/Network Administrator | http://www.over-yonder.net/~fullermd/ On the Internet, nobody can hear you scream. _______________________________________________ freebsd-geom@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-geom To unsubscribe, send any mail to "freebsd-geom-unsubscr...@freebsd.org"
