OK, this is odd. Here's what I get, can you guys help me figure this out?
$ mtx -f /dev/sg2 status
Storage Changer /dev/sg2:1 Drives, 8 Slots ( 0 Import/Export )
Data Transfer Element 0:Full (Storage Element 2 Loaded):VolumeTag = ABR832L6
Storage Element 1:Full :VolumeTag=ABR833L6
Storage Element 2:Empty
Storage Element 3:Empty
Storage Element 4:Empty
Storage Element 5:Empty
Storage Element 6:Empty
Storage Element 7:Empty
Storage Element 8:Empty
$ tapeinfo -f /dev/st0
Product Type: Tape Drive
Vendor ID: 'HP '
Product ID: 'Ultrium 6-SCSI '
Revision: '22CW'
Attached Changer API: No
SerialNumber: 'HU1246T9JH'
MinBlock: 1
MaxBlock: 16777215
SCSI ID: 0
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x5a
BlockSize: 0
DataCompEnabled: no
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
BOP: yes
Block Position: 0
ActivePartition: 0
EarlyWarningSize: 0
NumPartitions: 0
MaxPartitions: 3
$ amtapetype -c -f /dev/st0
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_CTYPE = "UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
Checking for FSF_AFTER_FILEMARK requirement
Applying heuristic check for compression.
Wrote random (uncompressible) data at 73472726.7096774 bytes/sec
Wrote fixed (compressible) data at 101229090.133333 bytes/sec
Compression: enabled
NOTE: I mistyped my last email. I ran mt on /dev/st0, not sg2. this email has
the correct devices.
Thanks for the help so far, Jean-François
On Apr 30, 2013, at 4:51 PM, Jean-Francois Malouin
<jean-francois.malo...@bic.mni.mcgill.ca> wrote:
> * Abilio Carvalho <abilio.carva...@bbp.ch> [20130430 10:36]:
>> sorry, no I hadn't disabled compression. Today I installed mt-st and
>> following the wiki I ran:
>>
>> mt -f /dev/sg2 compression 0
>> mt -f /dev/sg2 defcompression 0
>>
>> but when I now run amtapetype it still tells me:
>>
>> Applying heuristic check for compression.
>> Wrote random (uncompressible) data at 73376008.2580645 bytes/sec
>> Wrote fixed (compressible) data at 101095833.6 bytes/sec
>> Compression: enabled
>>
>> how can I make sure hardware compression is off?
>
> Make sure you have a tape loaded.
> Replace the tape drive scsi generic device sgX accordingly.
> In case of LTO5 here is what I get:
>
> ~# tapeinfo -f /dev/sgX
> Product Type: Tape Drive
> Vendor ID: 'HP '
> Product ID: 'Ultrium 5-SCSI '
> ...
> DataCompEnabled: yes
> DataCompCapable: yes
> DataDeCompEnabled: yes
> ...
>
> ~# mt-st -f /dev/nst0 defcompression 0
> ~# tapeinfo -f /dev/sgX
> ...
> DataCompEnabled: no
> DataCompCapable: yes
> DataDeCompEnabled: yes
>
> hth,
> jf
>
>>
>> On Apr 17, 2013, at 6:40 PM, Jean-Francois Malouin
>> <jean-francois.malo...@bic.mni.mcgill.ca> wrote:
>>
>>> * Abilio Carvalho <abilio.carva...@bbp.ch> [20130417 10:19]:
>>>> Well, since noone answered, I had to run amtapetype, so here it is if
>>>> anyone else needs it:
>>>>
>>>> define tapetype LTO6 {
>>>> comment "Created by amtapetype; compression enabled"
>>>> length 2442818848 kbytes
>>>> filemark 1806 kbytes
>>>> speed 74006 kps
>>>> blocksize 32 kbytes
>>>> }
>>>
>>> Hmmm, speed look way off. Native speed is 160MBs for LTO6...
>>> Did you disable hardware compression before running amtapetype?
>>> Also, you might want to test with larger blocksize, for LTO5 I use 2MB
>>> with good results....
>>>
>>> hth,
>>> jf
>>>
>>>>
>>>>
>>>> On Apr 16, 2013, at 3:24 PM, Abilio Carvalho <abilio.carva...@bbp.ch>
>>>> wrote:
>>>>
>>>>> Hi, just a quick question, does anyone have a tape type for an LTO6
>>>>> drive? (Ideally an HP Ultrium 6 SCSI)
>>>>>
>>>>> Thanks
>>>>> Abilio
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