Hi, Since kernel version 2.6.33 Linux supports the "discard" commando, mainly used by SSD's for their wear-leveling and performance.
It's also called TRIM: http://en.wikipedia.org/wiki/TRIM At the moment only Btrfs and EXT4 support trim/discard, but this could be a nice feature for sheepdog. If sheepdog reads the "discard" messages from the kernel in the VM you could figure out which blocks are free again and shrink the used space automatically. Some more information about TRIM/discard: * http://lwn.net/Articles/293658/ * http://en.wikipedia.org/wiki/Btrfs#Features * http://www.archivum.info/[email protected]/2009-03/01144/% 28Qemu-devel%29-Re:-%28patch-2-7%29-qemu:-separate-thread-for-io.html Might be a suggestion for Sheepdog? -- Met vriendelijke groet, Wido den Hollander Hoofd Systeembeheer / CSO Telefoon Support Nederland: 0900 9633 (45 cpm) Telefoon Support België: 0900 70312 (45 cpm) Telefoon Direct: (+31) (0)20 50 60 104 Fax: +31 (0)20 50 60 111 E-mail: [email protected] Website: http://www.pcextreme.nl Kennisbank: http://support.pcextreme.nl/ Netwerkstatus: http://nmc.pcextreme.nl -- sheepdog mailing list [email protected] http://lists.wpkg.org/mailman/listinfo/sheepdog
