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
}
