>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
