Daniel Bakken wrote:
When I send a filesystem with compression=gzip to another server with
compression=on, compression=gzip is not set on the received filesystem.
I am using:
zfs send -R promise1/arch...@daily.1 | zfs receive -vd sas
The zfs manpage says regarding the -R flag: "When received, all
properties, snapshots, descendent file systems, and clones are
preserved." Snapshots are preserved, but the compression property is
not. Any ideas why this doesn't work as advertised?
After build 128, locally set properties override received properties,
and this would be the expected behavior. In that case, the value was
received and you can see it like this:
% zfs get -o all compression tank
NAME PROPERTY VALUE RECEIVED SOURCE
tank compression on gzip local
%
You could make the received value the effective value (clearing the
local value) like this:
% zfs inherit -S compression tank
% zfs get -o all compression tank
NAME PROPERTY VALUE RECEIVED SOURCE
tank compression gzip gzip received
%
If the receive side is below the version that supports received
properties, then I would expect the receive to set compression=gzip.
After build 128 'zfs receive' prints an error message for every property
it fails to set. Before that version, 'zfs receive' is silent when it
fails to set a property so long as everything else is successful. I
might check whether I have permission to set compression with 'zfs
allow'. You could pipe the send stream to zstreamdump to verify that
compression=gzip is in the send stream, but I think before build 125 you
will not have zstreamdump.
Tom
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