Date: Wed, 27 May 2020 20:11:19 +0500 From: "Eugene M. Zheganin" <emz@norma.perm.ru> To: freebsd-stable@freebsd.org Subject: zfs receive -s: transfer got interrupted, but no token on the receiving side. Message-ID: <db413d1a-69db-bfab-2ed6-a0ea334f95ad@norma.perm.ru>
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Hello,
I have a ZFS dataset about 10T of actual size (may be more) that I need
to send over a very laggy connection. So I'm sending it from the
shell-script that reattempts to send it after a short timeout,
retrieving the send token first. Like that:
===Cut===
#!/bin/sh
exitstatus=1
token=`ssh user@server zfs get receive_resume_token data/reference |
grep -v SOURCE | awk '{print $3}'`
while ([ $exitstatus -ne 0 ])
do
zfs send -t $token | ssh -C user@server sudo zfs receive -Fus
data/reference
exitstatus=$?
echo "Send interrupted/ended, sleeping for 5 secs."
sleep 5
done
===Cut===
Usually this goes just flawlessly. But this time, due to a low transfer
speed and a very laggy connectivity, thus resulting in a send time of
several weeks, I got a problem:
about one reattempt out of 200 fails with a situation when there's no
snapshot on the receiving side (only an incomplete dataset which is
definitely smaller than original one), thus meaning that the dataset is
incomplete, but there's no token on this dataset. This happened already
twice, each time on a different size.
How can this even be possible ?
Recieving side side:
[root@playkey-nas:~]# zfs list -t all
NAME USED AVAIL REFER MOUNTPOINT
data 4,67T 20,8T 128K /data
data/reference 4,67T 20,8T 128K /data/reference
(as you can see there's no snapshot)
Sending side and the snapshot:
[root@san1:/usr/src]# zfs list -t all | grep data/reference@ver2_5917
data/reference@ver2_5917 44,3G - 7,73T -
Eugene.
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