On 08/06/09 12:19, Robert Lawhead wrote:
I'm puzzled by the size reported for incremental zfs send|zfs receive. I'd expect the
stream to be roughly the same size as the "used" blocks reported by zfs list.
Can anyone explain why the stream size reported is so much larger that the used data in
the source snapshots? Thanks.
part of the reason is that the send stream contains a lot of records for
free blocks and free objects. I'm working on a fix to the send stream
format that will eliminate some of that.
Lori
% zfs list -r -t snapshot mail/00 | tail -4
mail/0...@0000.nightly 1.98M - 34.1G -
mail/0...@0400.hourly 1.67M - 34.1G -
mail/0...@0800.hourly 1.43M - 34.1G -
mail/0...@1000.hourly 0 - 34.1G -
# zfs send -i mail/0...@0000.nightly mail/0...@0400.hourly | zfs receive -v -F
mailtest/00
receiving incremental stream of mail/0...@0400.hourly into
mailtest/0...@0400.hourly
received 17.9MB stream in 4 seconds (4.49MB/sec)
# zfs send -i mail/0...@0400.hourly mail/0...@0800.hourly | zfs receive -v -F mailtest/00
receiving incremental stream of mail/0...@0800.hourly into
mailtest/0...@0800.hourly
received 15.1MB stream in 1 seconds (15.1MB/sec)
# zfs send -i mail/0...@0800.hourly mail/0...@1000.hourly | zfs receive -v -F mailtest/00
receiving incremental stream of mail/0...@1000.hourly into
mailtest/0...@1000.hourly
received 13.7MB stream in 2 seconds (6.86MB/sec)
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