Re: Why warm-standby doesn't work using file-based log shipping method?

I try to setup warm-standby using file-based log shipping method:
Master: 5432 port
Standby:6432 port at same machine
Master's :

• wal_level = archive
• archive_mode = on
• archive_command = 'cp %p /home/postgres/archive/%f'

Standby's restore_command = 'cp /home/postgres/archive/%f %p'

1. Firstly do a base backup for Standby ( successfuly )
[postgres@localhost ~]$ /home/postgres/db/standby/pgsql/bin/postmaster -D /home/postgres/db/standby/pgsql/data --port=6432
LOG:  database system was interrupted; last known up at 2012-02-21 17:24:33 CST
LOG:  starting archive recovery
LOG:  restored log file "000000010000000000000006" from archive
LOG:  redo starts at 0/6000070
LOG:  consistent recovery state reached at 0/7000000
cp: cannot stat `/home/postgres/archive/000000010000000000000007': No such file or directory
LOG:  could not open file "pg_xlog/000000010000000000000007" (log file 0, segment 7): No such file or directory
LOG:  redo done at 0/6000094
LOG:  restored log file "000000010000000000000006" from archive
cp: cannot stat `/home/postgres/archive/00000002.history': No such file or directory
LOG:  selected new timeline ID: 2
cp: cannot stat `/home/postgres/archive/00000001.history': No such file or directory
LOG:  archive recovery complete
LOG:  database system is ready to accept connections
LOG:  autovacuum launcher started
2. Then, let standby running as  warm-standby mode with the following parameters in recovery.conf to enable it continously track the Master server:

• standby_mode = on
• restore_command = 'cp /home/postgres/archive/%f %p'
  

[postgres@localhost ~]$ /home/postgres/db/standby/pgsql/bin/postmaster -D /home/postgres/db/standby/pgsql/data --port=6432
LOG:  database system was shut down at 2012-02-21 17:29:38 CST
cp: cannot stat `/home/postgres/archive/00000003.history': No such file or directory
cp: cannot stat `/home/postgres/archive/00000002.history': No such file or directory
LOG:  entering standby mode
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory
WARNING:  WAL was generated with wal_level=minimal, data may be missing
HINT:  This happens if you temporarily set wal_level=minimal without taking a new base backup.
LOG:  consistent recovery state reached at 0/700013C
LOG:  record with zero length at 0/700013C
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory
cp: cannot stat `/home/postgres/archive/00000003.history': No such file or directory
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory
cp: cannot stat `/home/postgres/archive/00000003.history': No such file or directory
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory
cp: cannot stat `/home/postgres/archive/000000020000000000000007': No such file or directory

3. Then let us do some DML queries on Master, for example, I insert new tuples(large number, 1000000) to a table.
4. Theoreticaly new tuples could also be visible on Standby server some time later, yet after I promote the Standby to check, it reveals nothing has been down.

My question is:
1. Are there anything I have missed ?
2. I still can't understand why Standby(when running as standby mode) always try to find  `/home/postgres/archive/000000020000000000000007' file, yet Master only copy the following files to archive directory:
[postgres@localhost archive]$ cd /home/postgres/archive
[postgres@localhost archive]$ ls
000000010000000000000004
000000010000000000000005
000000010000000000000006
000000010000000000000006.00000020.backup
000000010000000000000007
000000010000000000000008
000000010000000000000009
obviously there is no 000000020000000000000007.


Thanks!