As an aside, my z/Appliance VTA/VTS has its own format that compresses then
encrypts data for images at rest and in flight across TCP networks. We also
provide tools to convert from several well known format to our format and back.
We also added 128 bits of CRC on each block to ensure data
IBM zPDT and all of its variants added compression as an option to the AWS tape
format like the HET format did. The problem is what compression mechanism did
they use. IBM has recently switch from LZ4 to zSTD compression in various
mainframe components like DDR. So I would guess that it is
...@vse2pdf.com]
Sent: Saturday, July 30, 2022 12:45 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: AWS and IDRC/compression
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
om: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf
> > of Tony Thigpen [t...@vse2pdf.com]
> > Sent: Saturday, July 30, 2022 12:45 PM
> > To: IBM-MAIN@LISTSERV.UA.EDU
> > Subject: Re: AWS and IDRC/compression
> >
> > I am working wit
[t...@vse2pdf.com]
> Sent: Saturday, July 30, 2022 12:45 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: AWS and IDRC/compression
>
> I am working with my VTA vendor to reduce storage usage on the
> appliance. Currently, they can compress after the unmount and uncompress
>
From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of
Tony Thigpen [t...@vse2pdf.com]
Sent: Saturday, July 30, 2022 12:45 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: AWS and IDRC/compression
I am working with my VTA vendor to reduce storage usage
y
Thigpen
Sent: Saturday, July 30, 2022 12:45 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: AWS and IDRC/compression
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, espec
oiting its optimal physical block
size.
Harry
From: IBM Mainframe Discussion List on behalf of
Tony Thigpen
Sent: Saturday, July 30, 2022 12:45 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: AWS and IDRC/compression
I am working with my VTA vendor to reduce sto
Yeah, there is no compression at all in the native AWS format. If your VTA
won't do HET or something similar, then you're stuck with AWS and then
compressing after the fact.
On Sat, Jul 30, 2022 at 11:45 AM Tony Thigpen wrote:
> I am working with my VTA vendor to reduce storage usage on the
>
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,
One of the vendors that uses AWS is Optica, their z/VT uses AWS format. It can
also compress internally, but you don't have to.
Brian
On Fri, 29 Jul 2022 21:44:25 -0500, Jay Maynard wrote:
>I'm curious. What are you trying to accomplish with it? If it's just a
>matter of faster transmission
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 wrote:
> Yes. But, it sounds like nobody else will support it as a data
> interchange, so it may
understanding, but no viable proposals.
> -Original Message-
> From: IBM Mainframe Discussion List On
> Behalf Of Tony Thigpen
> Sent: Friday, July 29, 2022 6:38 PM
> To: IBM-MAIN@LISTSERV.UA.EDU
> Subject: Re: AWS and IDRC/compression
>
> [EXTERNAL EMAIL]
>
> Yes. B
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,
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
Does anyone know of any 'standard' for stream based (during file
creation) compression of AWS tapes?
Tony Thigpen
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