> 1. Does variable FSB block sizing extend to files larger than record size, > concerning the last FSB allocated? > > In other words, for files larger than 128KB, that utilize more than one > full recordsize FSB, will the LAST FSB allocated be `right-sized' to fit > the remaining data, or will ZFS allocate a full recordsize FSB for the > last `chunk' of the file?
The last block is currently a multiple of the recordsize, but we intend to fix this. There are two options: one, to treat the last block as a special case; the other, to handle it automatically via compression. The former is a little more work, but has the advantage of reducing the file's in-memory footprint as well as its on-disk footprint. > 2. Can a developer confirm that COW occurs at the FSB level (vs. sector > level, for example)? > > In other words, when a single FSB (say 64KB file w/ recordsize=128KB) file > is modified, and it's only one sector within that file that's modified, is > it correct that what's copied-on-write is the entire 64KB FSB allocated to > that file? (This is a data recovery issue.) Yes, that's correct. Jeff _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
