C1537A reports wrong/different size in cstm output

[Terry Kummell]

We have a T600 with three DDS-3 tape drives. I believe they are all C1537A drives and I believe that they all have a capacity of 12GB uncompressed. However, when I run the following cstm command, I get varying results.

echo "selall;info;wait;infolog;view;done" | cstm > showme.dat

Here is the first entry.....
=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

-- Information Tool Log for SCSI Tape on path 0/28/0.0.0 --

Log creation time: Fri Sep 29 11:33:29 2000

Hardware path: 0/28/0.0.0


Device Qualifier: HPC1537A
Product ID: C1537A Hardware Path: 0/28/0.0.0
Device Type: SCSI Tap Logical Unit Number: 0
Vendor: HP Product Rev Level: HP02
Firmware Revision: 3.59 Tape Load Count: 8
Correctable Errors: 0 Uncorrectable Errors: 0
Mfg Date Code: 58 Servo Revision: 14.2
Compression Status: Enabled Compression Ratio:
[instant] 107 : 1
[average] 3 : 1
Capacity [M Byte]: 13629
Drive Status: Good
=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

Here is the second tape drive..... Notice that capacity is only 4+ GB and the compression ratio drops to about 9:1.


=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

-- Information Tool Log for SCSI Tape on path 0/28/0.2.0 --

Log creation time: Fri Sep 29 11:33:29 2000

Hardware path: 0/28/0.2.0


Device Qualifier: HPC1537A
Product ID: C1537A Hardware Path: 0/28/0.2.0
Device Type: SCSI Tape Logical Unit Number: 0
Vendor: HP Product Rev Level: HP02
Firmware Revision: 3.59 Tape Load Count: 6
Correctable Errors: 0 Uncorrectable Errors: 0
Mfg Date Code: 58 Servo Revision: 14.2
Compression Status: Enabled Compression Ratio:
[instant] 9 : 1
[average] 2 : 1
Capacity [M Byte]: 4512
Drive Status: Good
=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

Here is the last tape drive. Not much information here at all

=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

-- Information Tool Log for SCSI Tape on path 0/28/0.4.0 --

Log creation time: Fri Sep 29 11:33:29 2000

Hardware path: 0/28/0.4.0

=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=-+-=

Any ideas?

[John Palmer · Accepted solution]

It wouldn't be related to the type of tape that was loaded at the time would it?

DDS-3 tape (125M) capacity 12Gb native
DDS-2 tape (120M) capacity 4Gb Native

possibly the third drive had no tape loaded.

[alberto vasquez]

C1537A
The capacity is 12 GB without compression.
The typical compression ratio is 2:1 or 24 GB
For text and databases, compression can go up
to 4:1 or 48 GB

Check you tape.