× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.



SETOBJACC. 


John A. Jones, CISSP
Americas Information Security Officer
Jones Lang LaSalle, Inc.
V: +1-630-455-2787 F: +1-312-601-1782
john.jones@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rob@xxxxxxxxx
Sent: Thursday, August 24, 2006 11:24 AM
To: Midrange Systems Technical Discussion
Subject: RE: Single-level storage

I thought there was an option to leave a file in memory.  Didn't see
that on OVRDBF though...

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





"Haase, Justin C." <justin.haase@xxxxxxxxxxxx> 
Sent by: midrange-l-bounces@xxxxxxxxxxxx
08/24/2006 12:18 PM
Please respond to
Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>


To
"Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
cc

Subject
RE: Single-level storage






Yep, was talking about iSeries.

Say the box has 256 GB of RAM and a 4-disk raid 5 set of 70 GB drives.
That would give you 210 GB of usable disk.  There's no way that you'd
ever exceed the amount of ram, and it would give you 46 GB of "temp"
space to swap in/out logfiles or other extraneous junk.

Just a hypothetical... But it was my understanding that with
single-level storage on the iSeries, the system sees RAM and DASD as the
same and if you request something from disk, it pulls it in to memory
until something else kicks it out.  But if you have more main storage
than disk, it shouldn't ever get booted (with exception of logs and temp
and whatnot).

By no means do I want to do this, I was just thinking about it.
Besides, the days of high-speed chip-based DASD are coming within the
next 10-20 years.  We'll google this discussion in 2026 and laugh!


--
Justin C. Haase - iSeries System Engineer
IBM Certified Systems Expert - System i
Kingland Systems Corporation

-----Original Message-----
From: midrange-l-bounces+justin.haase=kingland.com@xxxxxxxxxxxx
[mailto:midrange-l-bounces+justin.haase=kingland.com@xxxxxxxxxxxx] On
Behalf Of Jones, John (US)
Sent: Thursday, August 24, 2006 11:11 AM
To: Midrange Systems Technical Discussion
Subject: RE: Single-level storage

Assuming you're talking about an iSeries and ignoring the lack of
cost-effectiveness of such a machine...

Writes are going to be flushed to disk either immediately or within a
few seconds depending on how it's set up. Main storage to DASD
controller cache to disk drives.  And you want that, too, to ensure data
is safely stored and to shorten the power-down RAM flush cycle.  After
all if you have a hard stop on the machine for some reason you don't
want to lose all of your production updates.

(The writes may be data but will also include spool files, message
queues, system history logs, journals, etc.)

The nice thing is that the writes won't slow system performance to any
noticeable degree.  The vast majority of the write activity will
basically be behind the scenes and take idle cycles or co-processors.

BTW, assuming upon startup you do a SETOBJACC on everything to
front-load in to RAM things will take a while -- maybe a long while --
to get going.


Now, on a Windows PC the problem is substantially the same: At some
point writes are done as file contents, event logs, etc. are changed as
part of a normal running system.  If you have a lot more RAM than needed
you could set up a RAM disk to eliminate some of the physical disk I/O.
Also, Windows will always use the swap file even when sufficient RAM
exists to avoid it.  Turning off the swap file in my experience has
always led to an unstable system.

John A. Jones, CISSP
Americas Information Security Officer
Jones Lang LaSalle, Inc.
V: +1-630-455-2787 F: +1-312-601-1782
john.jones@xxxxxxxxxx

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Haase, Justin C.
Sent: Thursday, August 24, 2006 10:26 AM
To: Midrange Systems Technical Discussion
Subject: Single-level storage

Noodle on this one.

If a system had equal or more main storage than attached DASD, would the
only disk activity be read operations until a shutdown when the system
would dump what's in main storage to disk?

--
Justin C. Haase - iSeries System Engineer IBM Certified Systems Expert -
System i Kingland Systems Corporation


CONFIDENTIALITY NOTICE:  This e-mail communication, including
attachments, is covered by the Electronic Communications Privacy Act, 18
U.S.C. 2510-2521, is confidential, and may be legally privileged.  If
you are not the intended recipient or believe you received this
communication in error, please reply to the sender indicating that fact
and delete the copy you received.  In addition, retention,
dissemination, distribution, copying, or otherwise use of the
information contained in this communication is strictly prohibited.
Thank you.

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe,
unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a
moment to review the archives at http://archive.midrange.com/midrange-l.
 

This email is for the use of the intended recipient(s) only.  If you
have received this email in error, please notify the sender immediately
and then delete it.  If you are not the intended recipient, you must not
keep, use, disclose, copy or distribute this email without the author's
prior permission.  We have taken precautions to minimize the risk of
transmitting software viruses, but we advise you to carry out your own
virus checks on any attachment to this message.  We cannot accept
liability for any loss or damage caused by software viruses.  The
information contained in this communication may be confidential and may
be subject to the attorney-client privilege. If you are the intended
recipient and you do not wish to receive similar electronic messages
from us in future then please respond to the sender to this effect.

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe,
unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a
moment to review the archives at http://archive.midrange.com/midrange-l.



CONFIDENTIALITY NOTICE:  This e-mail communication, including
attachments, 
is covered by the Electronic Communications Privacy Act, 18 U.S.C. 
2510-2521, is confidential, and may be legally privileged.  If you are
not 
the intended recipient or believe you received this communication in 
error, please reply to the sender indicating that fact and delete the
copy 
you received.  In addition, retention, dissemination, distribution, 
copying, or otherwise use of the information contained in this 
communication is strictly prohibited.  Thank you.


As an Amazon Associate we earn from qualifying purchases.

This thread ...

Replies:

Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.