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On 09/11/2013 04:47 PM, Brian Debelius wrote:
> Hi,
> 
> If so what OS, Kernel, SCSI adapter, and LTO drive are you using?

Scientific Linux 6.4
Kernel 2.6.32-358.14.1.el6.x86_64
SAS Adapter IBM 6GB SAS HBA 90Y4579 (using the LSI mpt2 driver 16.00.01.00)
Drive is HP Ultrium 5-SCSI, firmware Z51U

> What does your bacula-sd.conf look like?

Here is the relevant excerpt:

Device {
  Name = LTO-5
  Media Type = LTO-5
  Archive Device = /dev/nst0
  AutomaticMount = yes;               # when device opened, read it
  AlwaysOpen = yes;
  RemovableMedia = yes;
  RandomAccess = no;
  Maximum File Size = 8g;
  Minimum block size = 131072
  Maximum block size = 131072
  Changer Device = /dev/changer
  AutoChanger = yes
  Alert Command = "sh -c 'smartctl -H -l error /dev/sg11'"
  Maximum Spool Size = 3000g
  Spool Directory = /etc/bacula/spooldisk/BaculaSpool
  Maximum Network Buffer Size = 65536
}

> What is your drive block size set to?

No block size has been set using mt setblk/defblksize. But for the current
backup tape, the data is:

# mt -f /dev/nst0 status
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 32768 bytes. Density code 0x46 (LTO-4).
Soft error count since last status=0
General status bits on (41010000):
 BOT ONLINE IM_REP_EN

# tapeinfo -f /dev/nst0
Product Type: Tape Drive
Vendor ID: 'HP      '
Product ID: 'Ultrium 5-SCSI  '
Revision: 'Z51U'
Attached Changer API: No
SerialNumber: 'HU1324W3HT'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 3
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x46
BlockSize: 32768
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
Partition 0 Remaining Kbytes: 799204
Partition 0 Size in Kbytes: 799204
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 0

Again, the crucial part is that dd can easily handle larger block sizes (we
tested up to 2 MB). But btape fails with anything larger than 128 KB (see
log in previous mails).

Best regards,
  Andreas
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