New subject: [opensuse] HP Ultrium LTO Compression

27 Apr 2016

      the tar -t command only lists the files. Not the sizes.
but appending --totals shows the total at the end of the tar output

4352256 (4.1GiB)

du -s /srv/media/testfiles

4250656 4.1G

So now the files are bigger? Obviously not working still

mounting the tape device results in:
mount:  /dev/st3 is not a block device

and it does not mount.

using mt status: Tape block size 0 bytes. Density code 0x44

The density code of the lto2 0x42 and lto1 0x40
does this change if the drive is compressed?

output of 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 'C7438A', and revision 'V312'.
Mode 1 definition:  compression=1

stinit, processing tape 1
Mode 1, name '/dev/nst1'
Mode 2, name '/dev/nst1l'
Mode 3, name '/dev/nst1m'
Mode 4, name '/dev/nst1a'
The manufacturer is 'HP', product is 'Ultrium 1-SCSI', and revision 'P61D'.
Mode 1 definition:  compression=1

stinit, processing tape 2
Mode 1, name '/dev/nst2'
Mode 2, name '/dev/nst2l'
Mode 3, name '/dev/nst2m'
Mode 4, name '/dev/nst2a'
The manufacturer is 'HP', product is 'Ultrium 2-SCSI', and revision 'S65D'.
Mode 1 definition:  compression=1

stinit, processing tape 3
Mode 1, name '/dev/nst3'
Mode 2, name '/dev/nst3l'
Mode 3, name '/dev/nst3m'
Mode 4, name '/dev/nst3a'
The manufacturer is 'HP', product is 'Ultrium 3-SCSI', and revision 'D22D'.
Mode 1 definition:  compression=1

stinit, processing tape 4
Initialized 4 tape devices.

On 26 April 2016 at 23:59, Ritchie Fraser  wrote:
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On Tuesday 26 Apr 2016 21:43:52 you wrote:
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Hi Ritchie
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Thanks, so I have made a /etc/stinit.def (Below). and I ran stinit as
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root which said Initialized 4 tape devices.
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So now if I run tar -V test-tape -cvWf /dev/st3 /srv/some/data then
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should compression work?
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Tar options being
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-V label
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-c create
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-v verbose
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-W verify
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-f file
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Is there quicker a way to test if compression is on other that waiting
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several hours for a backup?
Backup a smaller directory of known size.
Then list tape contents using tar
-t or --list option
(this may just list the files in the current archive file (volume).
Alternatively mount the tape in your file system
mount /dev/st0 /mnt/tape
Then just
ls -lh
Compare the size of the archive file to the size of the directory
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Also, do you know how I can tell tar to split the backup once the tape
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is full and ask for another tape?
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Use -M or --multi-volume options
( https://www.gnu.org/software/tar/manualhtml_section/tar_79.html )
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Thanks
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Paul
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cat /etc/stinit.def
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#DAT72
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manufaturer=HP model = "C7438A" {
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mode1 compression=1
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}
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#LTO1
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manufaturer=HP model = "Ultrium 1-SCSI" {
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mode1 compression=1
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}
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#LTO2
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manufaturer=HP model = "Ultrium 2-SCSI" {
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mode1 compression=1
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}
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#LTO3
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manufaturer=HP model = "Ultrium 3-SCSI" {
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mode1 compression=1
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}
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On 22 April 2016 at 23:10, Ritchie Fraser  wrote:
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My reply to the [opensuse] list was bounced :-(...
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So I've forwarded it (below)
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R
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---------- Forwarded Message ----------
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Subject: Re: [opensuse] HP Ultrium LTO Compression
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Date: Friday 22 Apr 2016, 21:29:21
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From: Ritchie Fraser 
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To: opensuse@opensuse.org
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On Friday 22 Apr 2016 13:33:23 Per Jessen wrote:
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Greg Freemyer wrote:
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I don't recall if you have to add a call stinit during bootup, or if
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it is automatic.
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I've never had to do it.
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Hi Paul,
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I remember looking up info for the same issue at a previous company I
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worked for... They were using Bacula and the first two links below are
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for Bacula documentation...
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Ensuring that the Tape Modes Are Properly Set - Linux Only
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http://www.bacula.org/5.2.x-manuals/en/problems/problems/Testing_Your_Tape
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_Drive.html#SECTION00435000000000000000 [1]
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Tape Hardware Compression and Blocking Size
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http://www.bacula.org/5.2.x-manuals/en/problems/problems/Testing_Your_Tape
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_Drive.html#SECTION00436000000000000000 [2]
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Backup tape compression
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http://serverfault.com/questions/424936/backup-tape-compression [3]
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Open Source Backup - Hardware compression
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https://wiki.zmanda.com/index.php/Hardware_compression#Tape_drive_v.s._Lin
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ux_kernel_driver_compression_settings [4]
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--
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Kind Regards
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Ritchie
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--------
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[1]
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http://www.bacula.org/5.2.x-manuals/en/problems/problems/Testing_Your_Tape
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_Drive.html#SECTION00435000000000000000
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[2]
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http://www.bacula.org/5.2.x-manuals/en/problems/problems/Testing_Your_Tape
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_Drive.html#SECTION00436000000000000000
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[3] http://serverfault.com/questions/424936/backup-tape-compression
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[4]
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https://wiki.zmanda.com/index.php/Hardware_compression#Tape_drive_v.s._Lin
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ux_kernel_driver_compression_settings
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Kind Regards
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Ritchie
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Ritchie Fraser BSc (Hons)
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Home: +44 (1303) 891767
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Mobile: +44 (7867) 976708
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Web: http://www.ritchiefraser.co.uk
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Kind Regards
Ritchie
Ritchie Fraser BSc (Hons)
Home: +44 (1303) 891767
Mobile: +44 (7867) 976708
Web: http://www.ritchiefraser.co.uk
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Re: [opensuse] HP Ultrium LTO Compression

Paul Groves

Greg Freemyer

Carlos E. R.

Paul Groves

Darin Perusich

Andrei Borzenkov

Paul Groves

Andrei Borzenkov

Greg Freemyer

Andrei Borzenkov

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