I am working with my VTA vendor to reduce storage usage on the
appliance. Currently, they can compress after the unmount and uncompress
before the mount. But, this takes time, especially when servicing the
mount request if the tape is large.
I was thinking that doing an IDRC implementation, which is stream based
and performed during write/read, it might be faster even if it's not
compresses as much as with their current method.
But, if the AWS file is not compatible with IBM's implementation, then
it's going to add a step to send them the file. The current compressed
files can be uncompressed using standard linux tools.
Tony Thigpen
Jay Maynard wrote on 7/29/22 22:44:
I'm curious. What are you trying to accomplish with it? If it's just a
matter of faster transmission of entire tape images, AWS tapes compress
very well.
On Fri, Jul 29, 2022 at 8:38 PM Tony Thigpen <t...@vse2pdf.com> wrote:
Yes. But, it sounds like nobody else will support it as a data
interchange, so it may be unusable for us.
I will go look at it.
Tony Thigpen
Jay Maynard wrote on 7/29/22 06:38:
Are you talking about the tape data being compressed inside the AWS
image?
Hercules has a format that does this, upwardly compatible with AWS,
called
HET (Hercules Emulated Tape), but I don't know of any other
implementations
of it. Each block is compressed after being received from the program
writing the tape but before being written to the file and uncompressed
after being read but before being returned to the program reading the
tape.
On Fri, Jul 29, 2022 at 3:56 AM Tony Thigpen <t...@vse2pdf.com> wrote:
Does anyone know of any 'standard' for stream based (during file
creation) compression of AWS tapes?
Tony Thigpen
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