Is it safe to stop postgres in between pg_start_backup and pg_stop_backup?

[Jacob Scott <jacob.scott@xxxxxxxxx>]

Hi, 

Does upgrading a a disk being used by postgres (9.1, on Ubuntu) with the following process sound safe?

1. pg_start_backup
2. Take a filesystem snapshot (of a volume containing postgres data but not pg_xlog)
3. Bring a new higher performing disk online from snapshot
4. pg_ctl stop
5. switch disks (umount/remount at same mountpoint)
6. pg_ctl start
7. pg_stop_backup

This seems like an odd use case because pg_start_backup is designed for performing on-line backups, but I think it will give me minimum downtime.

Thanks,

Jacob