Hi,
I suggest you to take a serious look at ZFS: https://zfsonlinux.org/
With simply a few commands, mainly zpool and zfs, you can manage
everything in one stack:
* encryption: new in 0.8.0
* compression: with lz4, it's very lightweitgh with practically no
impact on cpu
* snapshots: it uses copy on write, no messing with complicated lvm
snapshot management. Instantaneous snapshots. And as a bonus you can
easily copy snapshots between hosts.
* arc, l2arc: better cache management than page cache on linux, not
simply an LRU
* it handles mount point for you
I don't see any problems to you procedure, just keep your generated WALs
during the backup procedure (pg-start-backup to pg-stop-backup).
Generally, you'll want to separate WAL directory from the data one.
Because I can't cover more in a simple email (tuning, parameters,
disable pg full page writes, disable pg page checksuming, etc.), here
are good resources:
* https://www.2ndquadrant.com/en/blog/pg-phriday-postgres-zfs/
* https://www.slideshare.net/SeanChittenden/postgresql-zfs-best-practices
* https://www.slideshare.net/SeanChittenden/postgres-on-zfs-lightning-talk
* From Oracle for Oracle, but it can helps:
o https://docs.oracle.com/cd/E36784_01/html/E36845/chapterzfs-db2.html
o
https://docs.oracle.com/cd/E53394_01/html/E54818/chapterzfs-1.html#scrolltoc
o
https://www.oracle.com/technetwork/server-storage/solaris10/config-solaris-zfs-wp-167894.pdf
Maybe someone else can share experience with PG + ZFS ?
Hope that helps
Bruno Lavoie
On 2019-05-30 3:38 p.m., Lu, Dan wrote:
Hello,
Would you be able to confirm for me that a host level LVM snapshot of
the PGDATA directory along with PG_WAL directly via LVM backup is
supported way of backup and restore?
I read about this here:
https://dba.stackexchange.com/questions/145361/backup-standby-database-using-lvm-snapshot
Is it as simple as:
èSELECT pg_start_backup('Begin LVM Backup At xyz');
èDo LVM backup from o/s end to backup PGDATA/PG_WAL
èSELECT pg_stop_backup();
Thanks.
Dan
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