Dedicated DASD are not eligible for VM's minidisk cache.
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On 7/28/06, J Leslie Turriff <[EMAIL PROTECTED]> wrote:
I believe that this is also true of minidisks that use the DEVNO rdev
format.
DEVNO is the dedicate for when you know the device address and
possibly don't have a (unique) volser for the device.
Rob
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On Friday, 07/28/2006 at 11:28 AST, Kenneth Libutti <[EMAIL PROTECTED]>
wrote:
> Is there is any benefit to using dedicated DASD vs minidisk with 5.2 on
a z/890
> ( No IOASSIST available)?
With dedicated dasd, CCW translation is marginally faster. But if memory
serves, you will lose minidisk cach
I believe that this is also true of minidisks that use the DEVNO rdev
format.
J. Leslie Turriff
VM Systems Programmer
Central Missouri State University
Room 400
Ward Edwards Building
Warrensburg MO 64093
660-543-4285
660-580-0523
[EMAIL PROTECTED]
>>>[EMAIL PROTECTED] 07/28/06 12:11 pm >>>
Fo
For dedicated volumes z/VM won't have to do relocation of seek/search/define
extent/locate extent cylinder values. Mind you this is not exactly a taxing
task given the typical channel program.
>> Is there is any benefit to using dedicated DASD vs minidisk with 5.2
>> on a z/890 ( No IOASSIST avail
> Is there is any benefit to using dedicated DASD vs minidisk with 5.2
on a
> z/890 ( No IOASSIST available)?
No, no more than on the z9, really. It really doesn't make that much
difference any more.
-- db
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For LINUX-390 subs
Is there is any benefit to using dedicated DASD vs minidisk with 5.2 on a z/890
( No IOASSIST available)?
Ken Libutti CNE, CNI, SCSA, RHCT
Asst. Director of Systems Services
Broward Community College
225 E. Las Olas Blvd. 31/330
Ft. Lauderdale, Fl 33301
Phone: 954-201-7361
Fax: 954-201-7053
[EMA
On Thursday, 07/27/2006 at 02:46 AST, David Boyes <[EMAIL PROTECTED]>
wrote:
> > > >Then again, if you have a z9, you probably don't much care. 8-)
> > what about performance and CPU overheads (zVM) in processing I/O's, is
> > it an issue?
>
> It (the difference between dedicated and minidisk I/O)
> > >Then again, if you have a z9, you probably don't much care. 8-)
> what about performance and CPU overheads (zVM) in processing I/O's, is
> it an issue?
It (the difference between dedicated and minidisk I/O) is measurable,
but the impact is smaller on the z9 systems due to the increased
proces
On 7/26/06, Marcy Cortes <[EMAIL PROTECTED]> wrote:
>> >Negatives:
>> >Lose hardware IOASSIST feature for non-dedicated volumes. Not as
>> >important as it used to be, but still noticeable.
>> That's gone anyway on a z9, right?
>Not sure, but I think so. Most of the other assorted hardware assis
>> >Negatives:
>> >Lose hardware IOASSIST feature for non-dedicated volumes. Not as
>> >important as it used to be, but still noticeable.
>> That's gone anyway on a z9, right?
>Not sure, but I think so. Most of the other assorted hardware assists
>are gone on the z9, so it wouldn't surprise me.
> >Negatives:
> >Lose hardware IOASSIST feature for non-dedicated volumes. Not as
> >important as it used to be, but still noticeable.
> That's gone anyway on a z9, right?
> Marcy Cortes
Not sure, but I think so. Most of the other assorted hardware assists
are gone on the z9, so it wouldn't surpri
>Negatives:
>Lose hardware IOASSIST feature for non-dedicated volumes. Not as
>important as it used to be, but still noticeable.
That's gone anyway on a z9, right?
Marcy Cortes
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26, 2006 2:26 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: MDISK vs DEDICATED DASD
> Wondering if anyone can tell me whether or not there is an advantage
or
> a reason or a disadvantage to using MDISKs for Linux servers if I
intend
> to turn off the MDC, verses using dedicated disks. I
> Wondering if anyone can tell me whether or not there is an advantage
or
> a reason or a disadvantage to using MDISKs for Linux servers if I
intend
> to turn off the MDC, verses using dedicated disks. I intend to use
the
> entire disks and not split them up.
Some things that come to my mind imme
Romanowski, John (OFT)
Sent: Wednesday, July 26, 2006 1:31 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: MDISK vs DEDICATED DASD
Not to throw you a curve but you could sort of do both at the same time:
In the guest's USER DIRECT definition, instead of DEDICATE vdev rdev
Which would dedicat
Port [mailto:[EMAIL PROTECTED] On Behalf Of
Ryan Stewart
Sent: Wednesday, July 26, 2006 1:08 PM
To: LINUX-390@VM.MARIST.EDU
Subject: MDISK vs DEDICATED DASD
Hi all,
Wondering if anyone can tell me whether or not there is an advantage or
a reason or a disadvantage to using MDISKs for Linux servers
Hi all,
Wondering if anyone can tell me whether or not there is an advantage or
a reason or a disadvantage to using MDISKs for Linux servers if I intend
to turn off the MDC, verses using dedicated disks. I intend to use the
entire disks and not split them up.
Thanks in advance.
Ryan Stewart
Sys
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