On 25 November, 2008 - Dave Brown sent me these 0,8K bytes: > I have RTFM'd through this list and a number of Sun docs at docs.sun > and can't find any information on how I might be able to write out 'hard > zeros' to the unused blocks on a ZFS. The reason I'd like to do this is > because if the storage (LUN/s) I'm providing to the ZFS is > thin-provisioned and doesn't know about a host O.S. file system and > whether a previously written disk block still has data on it, only > knowing it doesn't if all zero's are written, then how would I go about > doing that with ZFS? I was looking at the command mkfile, which looked > like it might do it, but I wasn't sure. Has anyone done this before and > can provide the instructions?
try turning compression off, then create a huge file (all free space) with mkfile.. Not sure about the exact bit storage with regards to checksum etc.. you might want to try with checksum off as well.. /Tomas -- Tomas Ögren, [EMAIL PROTECTED], http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
