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legato 7.1.1
- Thread starter nyck
- Start date
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- #3
Maybe. This could just be to serve the user better but must not necessarily have any technical impact at all. As the devices use standard SCSI commands, the drive type should not really matter - you can in fact use another one and it will run (probably not optimally).
The major differences you specify by selecting the drive type are:
- Block Size has an impact on speed and capacity
- Volume default Capacity has no impact on the behavior but will only be used to determine to which percentage a media has already been filled.
The major differences you specify by selecting the drive type are:
- Block Size has an impact on speed and capacity
- Volume default Capacity has no impact on the behavior but will only be used to determine to which percentage a media has already been filled.
You should, perhaps, make sure the Solaris st tape driver
is patched and can support your SDLT?
/kernel/drv>strings st | grep DLT
BNCHMARKDLT1
QUANTUM SDLT320
QUANTUM SuperDLT1
QUANTUM DLT8000
QUANTUM DLT7000
SUN DLT7000
Quantum DLT4000
SUN DLT4000
SUN DLT4700
Benchmark DLT1
Quantum Super DLT 320
Quantum Super DLT 220
Quantum DLT8000
Quantum DLT7000
Sun DLT7000
Quantum DLT4000
DLT4000
DLT4700 Library
is patched and can support your SDLT?
/kernel/drv>strings st | grep DLT
BNCHMARKDLT1
QUANTUM SDLT320
QUANTUM SuperDLT1
QUANTUM DLT8000
QUANTUM DLT7000
SUN DLT7000
Quantum DLT4000
SUN DLT4000
SUN DLT4700
Benchmark DLT1
Quantum Super DLT 320
Quantum Super DLT 220
Quantum DLT8000
Quantum DLT7000
Sun DLT7000
Quantum DLT4000
DLT4000
DLT4700 Library
Hello,
" - Block Size has an impact on speed and capacity"
As I undrstand, the blocksize is the same for any used types of tape drives, as it's a "global" env parameter, so the speed issue is clear, but i'm not sure that tape capacity depends on blocksize...
" - Block Size has an impact on speed and capacity"
As I undrstand, the blocksize is the same for any used types of tape drives, as it's a "global" env parameter, so the speed issue is clear, but i'm not sure that tape capacity depends on blocksize...
I do not know what you mean with "global" - of course a tape drive type should always have the same block size. But you may enforce different ones as well - it is nothing else but a parameter in the SCSI Mode select Parameter List. However, you usually do not change it if there is no need to do that.
On fast tape drives, you in fact must use large data blocks if you want to keep it streaming.
The larger the block size, the less gaps you will have. So the general rule is: Increasing block size will lead to a higher capacity.
On fast tape drives, you in fact must use large data blocks if you want to keep it streaming.
The larger the block size, the less gaps you will have. So the general rule is: Increasing block size will lead to a higher capacity.
Networker always uses variable block size mode.
SDLT 600 should appear as a choice soon. It is substantially the same as SDLT 320.
What you say about block sizes would be true if tape drives were dumb data sinks. However, when you write to a tape drive, you are really talking to a compression engine. There is no reasonable a priori assumption you can make unless you know the internals of the compression algorithm and its implementation in hardware.
In general drives in the same family will perform similarly in terms of optimal block size.
SDLT 600 should appear as a choice soon. It is substantially the same as SDLT 320.
What you say about block sizes would be true if tape drives were dumb data sinks. However, when you write to a tape drive, you are really talking to a compression engine. There is no reasonable a priori assumption you can make unless you know the internals of the compression algorithm and its implementation in hardware.
In general drives in the same family will perform similarly in terms of optimal block size.
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