Date: Tue, 19 Sep 2017 12:13:36 -0400 From: Juan Manuel Palacios <juan@kognito.com> To: freebsd-fs@freebsd.org Subject: Trying to understand confusing 'zfs diff' output Message-ID: <CAFzR3-pujG68fWfnUxD%2BeaYfrMKAaScUmO-fTLMkgbuuH-bKgg@mail.gmail.com>
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Hi everyone,
I'm trying to understand a result I'm seeing when comparing the diff of two
local ZFS snapshots that were successfully replicated to a remote pool over
SSH against the diff of their remote counterparts. The latter shows three
files as having been deleted, while the local diff of the exact same two
snapshots doesn't.
Following are those diffs, with empty lines entered manually into the local
diff where the remote one shows the deleted files; moreover, lines right
above & below this confusing part of the diffs have been trimmed for
brevity's sake, since they were identical across both outputs.
1) Local diff (FreeBSD 10.3-RELEASE-p21 system):
-> zfs diff zroot/mysql@automated_2017-07-31_23:45:04-EDT
zroot/mysql@automated_2017-08-01_23:45:03-EDT | gawk '{ match($2, /\/(.*)/,
matches); printf "%s\t%s\n", $1, matches[1]; }'
(trimmed)
M mysql/data/knet@002dlrs/lrs_providers.ibd
M mysql/data/snap/sessions.ibd
M mysql/data/knet@002dlrs/sessions.ibd
M mysql/data/leads/demo_requests.ibd
M mysql/tmp/nk-dev.sql.gz
M mysql/data/knet/account_manager_memberships.ibd
(trimmed)
2) Remote diff (FreeBSD 10.3-RELEASE-p19 system):
-> zfs diff backup/mysql@automated_2017-07-31_23:45:04-EDT
backup/mysql@automated_2017-08-01_23:45:03-EDT | gawk '{ match($2,
/\/mnt\/backup\/(.*)/, matches); printf "%s\t%s\n", $1, matches[1]; }'
(trimmed)
M mysql/data/knet@002dlrs/lrs_providers.ibd
- mysql/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql
M mysql/data/snap/sessions.ibd
M mysql/data/knet@002dlrs/sessions.ibd
M mysql/data/leads/demo_requests.ibd
M mysql/tmp/nk-dev.sql.gz
- mysql/replication/mysql-bin.001241
- mysql/replication/mysql-bin.001242
M mysql/data/knet/account_manager_memberships.ibd
(trimmed)
So, as I was saying, the remote diff shows these three files as having been
deleted, because they were:
1) Locally:
-> ls -l /mysql/.zfs/snapshot/automated_2017-07-31_23\:45\:
04-EDT/tmp/nk-dump--2017-07-19_01\:32\:16-EDT.sql
-rw-r--r-- 1 jmpp jmpp 46M Jul 19 01:32 /mysql/.zfs/snapshot/
automated_2017-07-31_23:45:04-EDT/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql
-> ls -l /mysql/.zfs/snapshot/automated_2017-08-01_23\:45\:
03-EDT/tmp/nk-dump--2017-07-19_01\:32\:16-EDT.sql
ls: /mysql/.zfs/snapshot/automated_2017-08-01_23:45:03-
EDT/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql: No such file or directory
2) On the remote pool:
-> ls -l /mnt/backup/mysql/.zfs/snapshot/automated_2017-07-31_
23\:45\:04-EDT/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql
-rw-r--r-- 1 1001 1001 48288840 Jul 18 22:32 /mnt/backup/mysql/.zfs/
snapshot/automated_2017-07-31_23:45:04-EDT/tmp/nk-dump--
2017-07-19_01:32:16-EDT.sql
-> ls -l /mnt/backup/mysql/.zfs/snapshot/automated_2017-08-01_
23\:45\:03-EDT/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql
ls: /mnt/backup/mysql/.zfs/snapshot/automated_2017-08-01_
23:45:03-EDT/tmp/nk-dump--2017-07-19_01:32:16-EDT.sql: No such file or
directory
And so for the other two files.
So, my question is, if the remote diff is correct in showing these files as
having been deleted between the two snapshots (it *is* correct in doing
that, right?), why does the local diff not show it also?
Thanks in advance for any help!
--
Juan Palacios
Senior Software Architect
<http://www.kognito.com>;
135 West 26th St l 12th Floor l NY, NY 10001
212.675.9234 l 646.217.3677
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