I had the same issue. Seems to work fine with compression on, just the
estimates are off.
Greg
On Thu, Aug 3, 2017 at 3:59 PM, Will Aoki <wa...@umnh.utah.edu> wrote:
> On Mon, Jul 31, 2017 at 04:37:37PM -0400, Chris Hoogendyk wrote:
> > Here is my latest attempt, working with a new, never been loaded, LTO7
> tape. I
> > should note that I have a page in my server notebook from July 2014
> showing
> > almost this exact sequence of commands when setting up my LTO6 library.
> >
> > Bottom line is that tapeinfo tells me compression is off, it's a new
> tape, then
> > amtapetype tells me compression is on.
>
> I wasn't able to get compression turned off on the LTO-7 drive in my
> Quantum
> SuperLoader 3. I ended up deciding to leave compression on, as it didn't
> seem
> to do any harm in my testing.
>
> My drive:
>
> Product Type: Tape Drive
> Vendor ID: 'IBM '
> Product ID: 'ULTRIUM-HH7 '
> Revision: 'FA17'
> Attached Changer API: No
> SerialNumber: '10WT------'
> MinBlock: 1
> MaxBlock: 8388608
> SCSI ID: 23
> SCSI LUN: 0
> Ready: yes
> BufferedMode: yes
> Medium Type: 0x78
> Density Code: 0x5c
> BlockSize: 0
> DataCompEnabled: yes
> DataCompCapable: yes
> DataDeCompEnabled: yes
> CompType: 0xff
> DeCompType: 0xff
> BOP: yes
> Block Position: 0
> Partition 0 Remaining Kbytes: -1
> Partition 0 Size in Kbytes: -1
> ActivePartition: 0
> EarlyWarningSize: 0
> NumPartitions: 0
> MaxPartitions: 3
>
> My tapetype:
>
> #Checking for FSF_AFTER_FILEMARK requirement
> #Applying heuristic check for compression.
> #Wrote random (uncompressible) data at 92327868.852459 bytes/sec
> #Wrote fixed (compressible) data at 165647058.823529 bytes/sec
> #Compression: enabled
> #Writing one file to fill the volume.
> #Wrote 6015744049152 bytes at 86102 kb/sec
> #Writing smaller files (60157427712 bytes) to determine filemark.
> define tapetype lto-7 {
> # Couldn't seem to get compression disabled...
> comment "Created by amtapetype; compression enabled"
> length 5874750048 kbytes
> filemark 12 kbytes
> speed 86102 kps
> blocksize 32 kbytes
> part_size 200G
> part_cache_type memory
> part_cache_max_size 48G
> }
>
>
--
Greg Dickie
just a guy
514-983-5400
