On Mon, 12 Apr 2010, Eric D. Mudama wrote:
The advantage of TRIM, even in high end SSDs, is that it allows you to effectively have additional "considerable extra space" available to the device for garbage collection and wear management when not all sectors are in use on the device. For most users, with anywhere from 5-15% of their device unused, this difference is significant and can improve performance greatly in some workloads. Without TRIM, the device has no way to use this space for anything but tracking the data that is no longer active. Based on the above, I think TRIM has the potential to help every SSD, not just the "cheap" SSDs.
It seems that the "above" was missing. What concrete evidence were you citing?
The value should be clearly demonstrated an fact (with many months of prototype testing with various devices) before the feature becomes a pervasive part of the operating system. Every article I have read about the value of TRIM is pure speculation.
Perhaps it will be found that TRIM has more value for SAN storage (to reclaim space for accounting purposes) than for SSDs.
Bob -- Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
