Re: [zfs-discuss] zvol space consumption vs ashift, metadata packing

2011-10-04 Thread Richard Elling
On Oct 4, 2011, at 4:14 PM, Daniel Carosone wrote: > I sent a zvol from host a, to host b, twice. Host b has two pools, > one ashift=9, one ashift=12. I sent the zvol to each of the pools on > b. The original source pool is ashift=9, and an old revision (2009_06 > because it's still running xen

[zfs-discuss] Fwd: Re: zvol space consumption vs ashift, metadata packing

2011-10-04 Thread Jim Klimov
Hello, Daniel, Apparently your data is represented by rather small files (thus many small data blocks), so proportion of metadata is relatively high, and your<4k blocks are now using at least 4k disk space. For data with small blocks (a 4k volume on an ashift=12 pool) I saw metadata use up most

[zfs-discuss] zvol space consumption vs ashift, metadata packing

2011-10-04 Thread Daniel Carosone
I sent a zvol from host a, to host b, twice. Host b has two pools, one ashift=9, one ashift=12. I sent the zvol to each of the pools on b. The original source pool is ashift=9, and an old revision (2009_06 because it's still running xen). I sent it twice, because something strange happened on