frecover checksum errors

[Tom Poczman]

GDay All,

Has anyone come across the following errors. These errors have occured while doing an frecover verification after a nightly backup

Error is .....

frecover(1020): block checksum mismatch
frecover(1003): backup id does not match expected value
frecover(1061): attempt to continue recovery with new backup id? (^[yY]/^[nN]) frecover(5427): unable to open controlling terminal

have done a "cstm" on the tape device and the info is ....

Hardware path: 8/8.6.0


Device Qualifier: QUANTUMDLT8000
Product ID: DLT8000 Hardware Path: 8/8.6.0
Device Type: SCSI Tape Logical Unit Number: 0
Vendor: QUANTUM Product Rev Level: 010F
Firmware Major Version: 15 Firmware Minor Version: 0
Read Errors Corrected: 0 Read Errors Uncorrected: 0
Write Errors Corrected: 0 Write Errors Uncorrected: 0
Tape Motion Hours: 1099 Power On Hours: 19060
Read Compression Ratio: 1.0 : 1 Write Compression Ratio: 1.0 : 1
Compression Status: Enabled
Serial Number: CXA11P1343
Drive Status: Good
-- Information Tool Log for SCSI Tape on path 8/8.6.0 --

The initial fbackup string is ....

/etc/fbackup -v -c $BACKUP/config -f $TAPEDRIVE -g $GRAPH >> $TAPELIST 2>&1

Then the frecover string is ...

/etc/frecover -r -N -v -f $TAPEDRIVE >> $TAPEVERIFY 2>&1

The tape device used is ....

TAPEDRIVE=/dev/rmt/0m

The contents of the config file used in the fbackup command is ....

# cat config
blocksperrecord 128
records 64
checkpointfreq 256
readerprocesses 3
maxretries 2
retrylimit 5000000
maxvoluses 5000
chgvol /var/adm/fbackupfiles/chgvol
error /var/adm/fbackupfiles/error
filesperfsm 200

All DLT tapes have been replaced with new ones

Appreciate any input.

cheers
Tom

[Steve Steel]

Hi

frecover is experiencing intermittant I/O problems while running.

Percentage wise it will be hardware.

Check the syslog.log for errors


Check also
1)Latest scsi/tap epatches
2)Can you read any other backups .
3)Is there a heavy process on the same bus at the time of the frecover which could be a problem.


Steve Steel