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:
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:
è SELECT pg_start_backup('Begin LVM Backup At xyz');
è Do LVM backup from o/s end to backup PGDATA/PG_WAL
è SELECT pg_stop_backup();
Thanks.
Dan
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