with channel extension and FOCUS in the 90s!).
I suspect this is similar deal.
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Aria
Bamdad
Sent: Tuesday, March 04, 2014 7:50 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slowness
On 03/03/2014 06:18 PM, Marcy Cortes wrote:
> Why does dasdfmt take so long?
Marcy --
Several options are available to you now, most immediate being to _take
the "low level" formatting out of Linux_. You can ...
* 'dasdfmt' a reference disk and then DDR that to all new disks, and
'fdasd -a
on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Marcy
Cortes
Sent: Tuesday, March 04, 2014 10:36 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: dasdfmt slowness
It is in a way. It is way worse under PPRC replication. XRC replication
probably isn't helping either. We do both.
e! That's a good idea though!
>
>
> -Original Message-
> From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of
> Berthold Gunreben
> Sent: Monday, March 03, 2014 11:47 PM
> To: LINUX-390@VM.MARIST.EDU
> Subject: Re: [LINUX-390] dasdfmt slowness
&g
X-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slowness
Marcy,
On my SLES 11-SP3 system, I can format a 65K cyl disk in a little over 12
minutes without PAV, etc. which is quite different from your 42 minutes number.
Maybe this is somehow hardware related?
systest:~ # time dasdfmt -f /dev/
: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Neale
Ferguson
Sent: Tuesday, March 04, 2014 6:47 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slowness
I'm still of the opinion that the hardware guys need to step up. The fact that
you have to go a
> I have no idea, if this is being investigated. For myself, I found a different
> solution. You can dasdfmt one disk, and then do a flashcopy to all other disks
> of the same size that should be formatted.
The Cornell Minidisk Manager code lives again 8-)
rom: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Marcy
Cortes
Sent: Tuesday, March 04, 2014 10:03 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: dasdfmt slowness
I did discover that I can do a whole bunch of them in parallel, getting the
i/o rates 4000k/sec or so seemingly withou
> I'm still of the opinion that the hardware guys need to step up. The fact that
> you have to go and do multitrack writes of count-key-data with zero filled
> records for the extent you're interested in seems like a huge waste of
> channel bandwidth and controller activity. Unlike the old days we'
ks for the xargs tip! Good idea!
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Pavelka,
Tomas
Sent: Tuesday, March 04, 2014 12:01 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slowness
What we do to speed dasdfmt up is to
Yay! Thanks! That's good news.
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Peter
Oberparleiter
Sent: Tuesday, March 04, 2014 2:23 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slowness
On 04.03.2014 00:18, Marcy C
If only I had the flashcopy feature! That's a good idea though!
-Original Message-
From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Berthold
Gunreben
Sent: Monday, March 03, 2014 11:47 PM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: [LINUX-390] dasdfmt slownes
I'm still of the opinion that the hardware guys need to step up. The fact that
you have to go and do multitrack writes of count-key-data with zero filled
records for the extent you're interested in seems like a huge waste of channel
bandwidth and controller activity. Unlike the old days we're no
On 04.03.2014 00:18, Marcy Cortes wrote:
> Back Nov 2012 ... a long discussion ensued.
>
>
> On 08.11.2012 00:58, Marcy Cortes wrote:
> It takes about 42 minutes here to dasdfmt a volume with 65519 cylinders on it.
> It takes about 18 minutes to dd an already formatted volume over to a new one.
> I
What we do to speed dasdfmt up is to split the large dasd into smaller
minidisks and join them by LVM. Then the individual minidisks can be formatted
in parallel. This is easy to script with xargs, which has the parameter
--max-procs that lets you specify the maximum number of worker processes t
Hi Marcy,
I have no idea, if this is being investigated. For myself, I found a
different solution. You can dasdfmt one disk, and then do a flashcopy
to all other disks of the same size that should be formatted.
Hope this helps...
Berthold
On Mon, 3 Mar 2014 23:18:19 +
Marcy Cortes wrote:
Back Nov 2012 ... a long discussion ensued.
On 08.11.2012 00:58, Marcy Cortes wrote:
It takes about 42 minutes here to dasdfmt a volume with 65519 cylinders on it.
It takes about 18 minutes to dd an already formatted volume over to a new one.
It also takes about 19 minutes to fill it up with zero
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