[Bacula-users] tape not being used to full capacity

Hi everybody,

I am trying to figure out what is happening with my backups. I don't
think the problem is with bacula, but I thought I'd ask here in case
someone experienced the same problem.

I am using a HP Ultrium-3 auto loader, but not using the autochanger
feature, just manually changing the tapes when needed.


The full backups are done using 800GB(2:1 compression) LTO-3 tapes. My
full backups are just under 300GB, but sometimes bacula thinks the tape
is full after writing about 230GB to it and requests a new tape.

I have enabled hardware compression, but it still writes less than the
uncompressed capacity of the tape.

Any clues on what might be causing this ?

Below are some information.



Thanks


Bruno




[root@dracula bacula]# tapeinfo -f /dev/sg0
Product Type: Tape Drive
Vendor ID: 'HP      '
Product ID: 'Ultrium 3-SCSI  '
Revision: 'D22W'
Attached Changer API: No
SerialNumber: 'HU10802KLK'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 4
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x42
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
Block Position: 378367
Partition 0 Remaining Kbytes: 200448
Partition 0 Size in Kbytes: 200448
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 0


bacula-sd.conf:
Device {
        Name = StorageWorks
        Media Type = LTO
        Archive Device = /dev/nst0
        AutomaticMount = yes
        AlwaysOpen =  no
        RemovableMedia = yes
        RandomAccess = no
        AutoChanger = no
        #Changer Command = "/usr/lib64/bacula/mtx-changer %c %o %S %a d"
        #Changer Device = /dev/sg1
        Alert Command = "sh -c 'smartctl -H -l error /dev/nst0'"
        Spool Directory = /var/spool/bacula
        Maximum Spool Size = 50GB




HP LTT:

Product ID               : Ultrium 3-SCSI
Drive Technology         : LTO
Mech. Serial Number      : HU10802KLK
Firmware Rev             : D22W/MSL G3/1x8 G2
Target ID                : 4
Target LUN               : 0
OBDR Capability          : Not Present
WORM Capability          : Present

Cartridge Information (for cartridge currently in drive):
Cartridge Type : LTO 3 Data
* Capacity      : 800 GB (assumes 2:1 data compression)
Write Protected : No
Serial ID       : SLOT0000


30-Dec 05:30 dracula-dir JobId 877: Start Backup JobId 877,
Job=rhino.2008-12-29_22.00.32
30-Dec 05:33 dracula-dir JobId 877: Using Device "StorageWorks"
30-Dec 05:33 dracula-sd JobId 877: Spooling data ...
30-Dec 07:03 dracula-sd JobId 877: User specified spool size reached.
30-Dec 07:03 dracula-sd JobId 877: Writing spooled data to Volume.
Despooling 27,811,908,212 bytes ...
30-Dec 07:14 dracula-sd JobId 877: Despooling elapsed time = 00:10:57,
Transfer rate = 42.33 M bytes/second
30-Dec 07:15 dracula-sd JobId 877: Spooling data again ...
30-Dec 09:50 dracula-sd JobId 877: User specified spool size reached.
30-Dec 09:50 dracula-sd JobId 877: Writing spooled data to Volume.
Despooling 50,000,033,648 bytes ...
30-Dec 10:10 dracula-sd JobId 877: Despooling elapsed time = 00:19:42,
Transfer rate = 42.30 M bytes/second
30-Dec 10:11 dracula-sd JobId 877: Spooling data again ...
30-Dec 12:24 dracula-sd JobId 877: Job write elapsed time = 06:50:55,
Transfer rate = 4.968 M bytes/second
30-Dec 12:24 dracula-sd JobId 877: Committing spooled data to Volume
"NIX-DME-DEC-2008". Despooling 44,805,130,929 bytes ...
30-Dec 12:24 dracula-sd JobId 877: Error: block.c:568 Write error at
226:14539 on device "StorageWorks" (/dev/nst0). ERR=Input/output error.
30-Dec 12:24 dracula-sd JobId 877: Error: Re-read of last block OK, but
block numbers differ. Last block=774904 Current block=1.
30-Dec 12:24 dracula-sd JobId 877: End of medium on Volume
"NIX-DME-DEC-2008" Bytes=223,406,346,240 Blocks=3,463,019 at 30-Dec-2008
12:24.
30-Dec 12:24 dracula-sd JobId 877: Job rhino.2008-12-29_22.00.32
waiting. Cannot find any appendable volumes.
Please use the "label"  command to create a new Volume for:
    Storage:      "StorageWorks" (/dev/nst0)
    Pool:         NIX-DME-MONTHLY
    Media type:   LTO




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