Hi list,
A few months ago we were talking about a problem of compression on LTO-3
device "LTO-3 tape Not Compressing data / premature end of tape space" (
http://www.mail-archive.com/bacula-users @ lists .
sourceforge.net/msg43952.html).
It appears that the problem was resolved by updating the driver "st. "
In my case I updated the driver to this version, but I'm having the same
problem: "in an LTO-3 device with a maximum capacity of 800 GB with
compression enabled, only allows me to use 400 GB. "
And another problem I see is the speed of recording is only 11 MB / sec
through the Bacula, when I run a Job.
Do not understand why the speed that shows when I run "fill"in the console
btape, which the approximately 43 MB / sec and when I run a job is only 11
MB / sec
I have a Centos 5.5
"Device:" HP StorageWorks Ultrium 920 - Tape drive - LTO Ultrium (400 GB /
800 GB) "
scsi-card: HP Smart Array Controller Memory P212/Zero
-tapes: ULTRIUM LTO3, LTO Linear Tape-Open, RW C7973A 800GB
I also added a service in /etc/init.d / to run at startup "stinit. "
I also copied the following information:
#dmesg|grep scsi:
scsi0 : ahci
scsi1 : ahci
scsi2 : ahci
scsi3 : ahci
sd 0:0:0:0: Attached scsi disk sda
sd 1:0:0:0: Attached scsi disk sdb
sd 2:0:0:0: Attached scsi disk sdc
sd 3:0:0:0: Attached scsi disk sdd
scsi4 : ata_piix
scsi5 : ata_piix
sd 0:0:0:0: Attached scsi generic sg0 type 0
sd 1:0:0:0: Attached scsi generic sg1 type 0
sd 2:0:0:0: Attached scsi generic sg2 type 0
sd 3:0:0:0: Attached scsi generic sg3 type 0
scsi 5:0:0:0: Attached scsi generic sg4 type 5
sr0: scsi3-mmc drive: 24x/24x writer dvd-ram cd/rw xa/form2 cdda tray
sr 5:0:0:0: Attached scsi CD-ROM sr0
scsi6 : cciss
scsi 6:0:0:0: Attached scsi generic sg5 type 1
st 6:0:0:0: Attached scsi tape st0
[<f8e08c4f>] st_do_scsi+0x1e7/0x20f [st]
[<f8e08c68>] st_do_scsi+0x200/0x20f [st]
********************
#cat /proc/scsi/scsi
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160EAFJE Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB1000EAMYC Rev: HPG1
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB1000EAMYC Rev: HPG1
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi3 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: GB0160EAFJE Rev: n/a
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi5 Channel: 00 Id: 00 Lun: 00
Vendor: Optiarc Model: DVD RW AD-7561S Rev: AH52
Type: CD-ROM ANSI SCSI revision: 05
Host: scsi6 Channel: 00 Id: 00 Lun: 00
Vendor: HP Model: Ultrium 3-SCSI Rev: Q24D
Type: Sequential-Access ANSI SCSI revision: 05
**********************
#tapeinfo -f /dev/sg5
Product Type: Tape Drive
Vendor ID: 'HP '
Product ID: 'Ultrium 3-SCSI '
Revision: 'Q24D'
Attached Changer: No
SerialNumber: 'HU11039DWP'
MinBlock:1
MaxBlock:16777215
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x44
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
***********************
#mt -f /dev/st0 status
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 0 bytes. Density code 0x44 (LTO-3).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
*******************
# stinit -v -v
Trying to open database '/etc/stinit.def'.
Open succeeded.
stinit, processing tape 0
Mode 1, name '/dev/nst0'
Mode 2, name '/dev/nst0l'
Mode 3, name '/dev/nst0m'
Mode 4, name '/dev/nst0a'
The manufacturer is 'HP', product is 'Ultrium 3-SCSI', and revision 'Q24D'.
Mode 1 definition: scsi2logical=1 compression=1 drive-buffering=1 read-ahead
async-writes blocksize=0
Mode 2 definition: scsi2logical=1 compression=1 drive-buffering=1 read-ahead
async-writes blocksize=
Mode 3 definition: scsi2logical=1 compression=1 drive-buffering=1 read-ahead
async-writes blocksize=0
Mode 4 definition: scsi2logical=1 compression=1 drive-buffering=1 read-ahead
async-writes blocksize=0
stinit, processing tape 1
Initialized 1 tape device
*****************
# mt -v
mt-st v. 1.1
***************
config bacula-sd.conf
Device {
Name = LTO-3
Drive Index = 0
Autochanger = no
Archive Device = /dev/nst0
Maximum Changer Wait = 3d
AutomaticMount = yes
AlwaysOpen = yes
Media Type = LTO-3
RemovableMedia = yes
Offline On Unmount = no
Spool Directory = /var/lib/bacula/spool
Maximum Spool Size = 35gb
RandomAccess = no
LabelMedia = yes
Hardware End of Medium = No
Fast Forward Space File = No
Two EOF = no
BSF at EOM = no
}
Any help is appreciated!
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