Re: How to cable two ESLS disk expansion units to our new EMX0 expansion unit.

The EPX0 drawers are not connected to different LPARs only the slots are and thus the DASD Drawers are as well. So if you do have two EPX0s then yest split the RAID cards across them as suggested. This is better for redundancy and often performance as well.


- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 7/19/2017 10:17 AM, Steinmetz, Paul wrote:

Larry,

My drawers connect to two different LPARS.
But if you actually have two different physical systems, can the drawer only be connected to one physical system?

Paul

-----Original Message-----
From: DrFranken [mailto:midrange@xxxxxxxxxxxx]
Sent: Wednesday, July 19, 2017 10:15 AM
To: Midrange Systems Technical Discussion; Steinmetz, Paul
Subject: Re: How to cable two ESLS disk expansion units to our new EMX0 expansion unit.

I think his drawers are attaching to different systems. :-) If not you are correct.

- Larry "DrFranken" Bolhuis

www.Frankeni.com
www.iDevCloud.com - Personal Development IBM i timeshare service.
www.iInTheCloud.com - Commercial IBM i Cloud Hosting.

On 7/19/2017 10:05 AM, Steinmetz, Paul wrote:

Rob,

One other thing to consider, since you have two drawers.
For each pair, have one card in one drawer, C1, and the other card of the pair in the 2nd drawer, C4.
If a drawer would fail, both cards are not In the same drawer.

I have my P7-8205, dual 5877, dual 57B5, EXP24S connected in this fashion.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of
Steve Pavlichek
Sent: Wednesday, July 19, 2017 9:48 AM
To: Midrange Systems Technical Discussion
Subject: RE: How to cable two ESLS disk expansion units to our new EMX0 expansion unit.

You can attached both SSDs and HDDs to a EJ0L/EJ14, just not on the same port.

A maximum of 96 SAS devices are supported using four 5887 disk drive enclosure. The SAS devices can be all HDDs or can have up to 48 SSD + 48 HDDs (HDDs must be on the 3rd and 4th ports). They can have a maximum of 72 SSDs with no HDDs and must have an AA cable on the top port. If there are over 48 SSDs, then no HDDs can be attached.

From: DrFranken<mailto:midrange@xxxxxxxxxxxx>
Sent: Wednesday, July 19, 2017 8:58 AM
To: Midrange Systems Technical
Discussion<mailto:midrange-l@xxxxxxxxxxxx>; Rob
Berendt<mailto:rob@xxxxxxxxx>
Subject: Re: How to cable two ESLS disk expansion units to our new EMX0 expansion unit.

I don't recall the numbers on how many SSDs each card pair can support but for sure they haven't recommended SSDs and Spinny drives on the same adapter pair for years.

- Larry "DrFranken" Bolhuis

www.Frankeni.com<http://www.Frankeni.com>
www.iDevCloud.com<http://www.iDevCloud.com> - Personal Development IBM i timeshare service.
www.iInTheCloud.com<http://www.iInTheCloud.com> - Commercial IBM i Cloud Hosting.

On 7/19/2017 8:48 AM, Rob Berendt wrote:

Also agree on this
<snip>
You also have slight overkill with two adapter pairs there you could
have put both drawers on one adapter pair but now you're set for
expansion.
</snip>

On our system unit we have one pair of cards supporting two expansion
units, like you mention.

Our expansion units, like our old expansion units will be all SSD's.
The only difference will be the new SSD's will be much larger and
newer. Due to maintenance costs we are going to self maintain those
old SSD's and unload/reload to the new SSD's. The old SSD's will be
used as a secondary ASP (not an iASP).


Rob Berendt

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