On Thu, Sep 17, 2009 at 10:55 PM, Kris Buelens kris.buel...@gmail.com wrote:
Using V-disks: less I/O involved: no CP format, and CMS format doesn't need
to write nK data blocks all over the disk. But, V-disk pages are considered
as shared storage by CP. So, V-disk pages may stay longer in
-
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Schuh, Richard
Sent: Thursday, September 17, 2009 4:08 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
The simplest mode of recovering data from a T-disk in CMS requires only
On Thu, Sep 17, 2009 at 10:18 PM, Gentry, Stephen
stephen.gen...@lafayettelife.com wrote:
Just did a quick test on a test VM system. CLEAR_TDisk is enabled. With
a T-DISK size of 1300 cylinders, clearing/formatting it isn't noticed,
speed wise. Would have thought I would have gotten a
: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On Behalf
Of Rob van der Heij
Sent: Friday, September 18, 2009 8:49 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
On Thu, Sep 17, 2009 at 10:18 PM, Gentry, Stephen
stephen.gen...@lafayettelife.com wrote
.
Regards,
Richard Schuh
-Original Message-
From: The IBM z/VM Operating System
[mailto:ib...@listserv.uark.edu] On Behalf Of Alan Altmark
Sent: Wednesday, September 16, 2009 6:51 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
On Wednesday, 09/16
] TDISK and SYSTEM CONFIG question.
If you have the page space to support it, you can get by without TDSK space by
using V-disk. It is always cleared very quickly, by CP, before it is used and
does not pose the security problems that you find in T-disk. A large V-disk is
also faster to format
[mailto:ib...@listserv.uark.edu] On Behalf
Of O'Brien, Dennis L
Sent: Thursday, September 17, 2009 2:15 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
What security problems in T-Disk? If you enable Clear_TDisk, there's no
security problem. Even if the system
: Thursday, September 17, 2009 11:29 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
I guess I should have read Richard's response closer. So,
I'll echo Dennis's question as well.
What security problem?
We do not have CLEAR_TDisk enabled. Every time we define a
t
Without CLEAR_Tdisk enabled, whatever data the last user stored in
T-DISK space is still present when it is allocated to the next user. To
successfully use the space with CMS you will most likely have to format
it, unless the boundaries of your TDISK allocation exactly overlay the
previous
Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Tom Rae
Sent: Thursday, September 17, 2009 3:05 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
Without CLEAR_Tdisk enabled, whatever data the last user stored in
T-DISK space is still present when
-Original Message-
From: The IBM z/VM Operating System
[mailto:ib...@listserv.uark.edu] On Behalf Of Tom Rae
Sent: Thursday, September 17, 2009 12:05 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
Without CLEAR_Tdisk enabled, whatever data the last user
[mailto:ib...@listserv.uark.edu] On Behalf Of Tom Rae
Sent: Thursday, September 17, 2009 12:05 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: TDISK and SYSTEM CONFIG question.
Without CLEAR_Tdisk enabled, whatever data the last user
stored in T-DISK space is still present when
On Thursday, 09/17/2009 at 04:00 EDT, Gentry, Stephen
stephen.gen...@lafayettelife.com wrote:
As mentioned in my question below, we have to format the defined temp
minidisk every time. So, from that point of view, the data is gone. I
didn't think of the DDR situation. However, a class G user
On 9/17/09 5:18 PM, Alan Altmark alan_altm...@us.ibm.com wrote:
If I get my way, ENABLE CLEAR_TDISK will become the default and you won't
be able to change it. :-)
Want a requirement? 8-)
-- db
: Re: TDISK and SYSTEM CONFIG question.
As far as I know, without Clear_Tdisk, CP still formats the first cylinder of a
T-disk, so ACCESS will always fail even if you'd get a T-disk at the same place
as the previous user. But, with DDR or alike one could still find raw data on
other cylinders
I seem to remember a thread from long ago that discussed
unchangeable defaults. :-)
Original message
Date: Thu, 17 Sep 2009 17:18:30 -0400
From: Alan Altmark alan_altm...@us.ibm.com
Subject: Re: TDISK and SYSTEM CONFIG question.
To: IBMVM@LISTSERV.UARK.EDU
On Thursday, 09
There is an option in the SYSTEM CONFIG file to clear the T-DISK. It is
in the FEATURES list and CLEAR_TDISK can be either ENABLED or DISABLED.
The manual states that it clears only cylinder 0 (zero) or the first
eight blocks on the temporary minidisk when it detaches the minidisk. Do
they mean
at chess, but it was no match for me in kickboxing.
From: The IBM z/VM Operating System [mailto:ib...@listserv.uark.edu] On
Behalf Of Gentry, Stephen
Sent: Wednesday, September 16, 2009 14:10
To: IBMVM@LISTSERV.UARK.EDU
Subject: [IBMVM] TDISK and SYSTEM CONFIG question.
There is an option
On Wednesday, 09/16/2009 at 07:14 EDT, Gentry, Stephen
stephen.gen...@lafayettelife.com wrote:
Further, and in the same manual, it states that you can clear each
T-DISK
before it is reassigned. It depends on your point of view but this
seems
contradictory. Clear, in my opinion, means
19 matches
Mail list logo
