consistent postgresql snapshot

["Zwettler Markus (OIZ)" <Markus.Zwettler@xxxxxxxxxx>]

PostgreSQL12 running on CentOS7 + ext4.

 

Would it be save to do a "fsfreeze –freeze" + disk snapshot + "fsfreeze –unfreeze" of the PGDATA filesystem to get a consistent snapshot?

 

I am wondering as PostgreSQL default blocksize = 8k while ext4 default blocksize = 4k, resulting in 2 fs blocks per db block.

 

Thanks, Markus