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From: KK CHN <[email protected]>
To: pgsql-general <[email protected]>
Subject: PgBackRest Full backup and N/W reliability
Date: Thu, 29 Aug 2024 11:51:54 +0530
Message-ID: <CAKgGyB-bipQT+Mtyfv6xntS7w=_tp0sTeMkZLydMgzkC_6yvqg@mail.gmail.com> (raw)

List,

I am doing a full backup  using PgBackRest from a production server to
Reposerver.

My connection is  IPSec VPN over ILL  ( 8 Mbps link) between the
 Production DB Server and  the remote RepoServer.

I understood the  bottleneck of 8 Mbps between servers. (Server NICs 10Gbps
and switch)

Query : I have started the  backup command  and it is running (may go for
hours and days as link speed is minimal) .
If the link disconnected or Network error  happens before completion of the
backup command  Definitely the option is to reissue the  backup command
again.

If so, does the backup process start  again from  scratch ?   or it resumes
from  where the backup process is stopped   ?

If it starts from scratch I am afraid that  I can''t complete the initial
full backup never :(

  Or is there a work around if the network connectivity is lost in between
?


Any suggestions much appreciated

Thank you ,
Krishane

[root@dbtest pgbackrest]# sudo -u postgres pgbackrest --stanza=Repo
--log-level-console=info backup

2024-08-29 10:55:27.729 P00   INFO: backup command begin 2.52.1: --delta
--exec-id=523103-56943986 --log-level-console=info --log-level-file=debug
--pg1-host=10.15.0.202 --pg1-host-user=enterprisedb
--pg1-path=/data/edb/as16/data --pg-version-force=16 --process-max=5
--repo1-block --repo1-bundle --repo1-cipher-pass=<redacted>
--repo1-cipher-type=aes-256-cbc --repo1-path=/data/DB_BKUPS
--repo1-retention-diff=2 --repo1-retention-full=2 --stanza=Repo --start-fast
WARN: no prior backup exists, incr backup has been changed to full
2024-08-29 10:55:30.589 P00   INFO: execute non-exclusive backup start:
backup begins after the requested immediate checkpoint completes
2024-08-29 10:55:31.543 P00   INFO: backup start archive =
00000001000000850000004C, lsn = 85/4C0007F8
2024-08-29 10:55:31.543 P00   INFO: check archive for prior segment
00000001000000850000004B


ON Repo Server:
[root@dbtest backup]# date
Thursday 29 August 2024 10:58:08 AM IST
[root@dbtest backup]# du -h
165M    ./Repo
165M

[root@dbtest backup]# date
Thursday 29 August 2024 11:37:03 AM IST
[root@dbtest backup]# du -h
1.9G    ./Repo
1.9G

ON  Production Server    /data/edb/as16/data    directory size is   500 GB

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