thank you. this is exactly what I was looking for.
This is for remote replication so it looks like I am out of luck.
bummer.
Asa
On Apr 14, 2008, at 4:09 PM, Jeff Bonwick wrote:
Not at present, but it's a good RFE. Unfortunately it won't be
quite as simple as just adding an ioctl to report the dnode checksum.
To see why, consider a file with one level of indirection: that is,
it consists of a dnode, a single indirect block, and several data
blocks.
The indirect block contains the checksums of all the data blocks --
handy.
The dnode contains the checksum of the indirect block -- but that's
not
so handy, because the indirect block contains more than just
checksums;
it also contains pointers to blocks, which are specific to the
physical
layout of the data on your machine. If you did remote replication
using
zfs send | ssh elsewhere zfs recv, the dnode checksum on 'elsewhere'
would not be the same.
Jeff
On Tue, Apr 08, 2008 at 01:45:16PM -0700, asa wrote:
Hello all. I am looking to be able to verify my zfs backups in the
most minimal way, ie without having to md5 the whole volume.
Is there a way to get a checksum for a snapshot and compare it to
another zfs volume, containing all the same blocks and verify they
contain the same information? Even when I destroy the snapshot on the
source?
kind of like:
zfs create tank/myfs
dd if=/dev/urandom bs=128k count=1000 of=/tank/myfs/TESTFILE
zfs snapshot tank/[EMAIL PROTECTED]
zfs send tank/[EMAIL PROTECTED] | zfs recv tank/myfs_BACKUP
zfs destroy tank/[EMAIL PROTECTED]
zfs snapshot tank/[EMAIL PROTECTED]
someCheckSumVodooFunc(tank/myfs)
someCheckSumVodooFunc(tank/myfs_BACKUP)
is there some zdb hackery which results in a metadata checksum usable
in this scenario?
Thank you all!
Asa
zfs worshiper
Berkeley, CA
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