[Bacula-users] LTO-3 tape Not Compressing data and speed
2011-01-13 07:19:30
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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