Postgres online backup and restore has errors that are concerning

I started an online backup of postgres, tar’d my data folder, copy to usb
drive in production
and restored it into my RC environment. Have I missed
something important?

Online
Backup

psql
checkpoint;
SELECT
pg_switch_xlog();
SELECT
pg_start_backup('postres_full_backup_June222009');
tar -czvf
pgprd01_June22_2009_production.dmp.tar.gz data/
SELECT
pg_stop_backup();

Restore
tar –xzvf
pgprd01_June22_2009_production.dmp.tar.gz

When starting the database I
receive many errors that look like the backup was
corrupted.

2009-06-23 08:29:15
EDT:@:7614ERROR: xlog flush request 10D/590D6578 is not satisfied --- flushed
only to 10D/510C4FB8
2009-06-23 08:29:15
EDT:@:7614CONTEXT: writing block 2 of relation
16403/16884/2696
2009-06-23 08:29:16
EDT:@:7614ERROR: xlog flush request 10D/590D6578 is not satisfied --- flushed
only to 10D/510C4FB8
2009-06-23 08:29:16
EDT:@:7614CONTEXT: writing block 2 of relation
16403/16884/2696
2009-06-23 08:29:16
EDT:@:7614WARNING: could not write block 2 of
16403/16884/2696

pgdb001=> select
criteria_rank from client001.t1020screen where criteria_rank like
'%TR009%';
ERROR: missing chunk number
0 for toast value 738680

Version
[postgres(at)pgprd01 data]$ cat
PG_VERSION
8.3

Chris Barnes
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