Re: RAID definition -- MIDRANGE-L

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Yes these mainstream disks are a good option in many cases. In this case, however, Jim's company keeps their system for a decade. Thus the mainstream SSDs may run out of writes in that time and then need replacement at their cost.

Another thing to be careful about is too few disks overall. Yes one SSD can outperform a whole stack of spinny disks but if you select two SSDs and mirror them there is a Very High probability that your performance will be poor as IBM i does not do well with too few arms. Six drives is really a minimum for most systems no matter what the technology.

- Larry "DrFranken" Bolhuis

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

On 8/9/2018 9:50 AM, Diego Kesselman wrote:

You can ask for 931GB mainstream SSDs. Same price per GB as 15k HDD

El 9 ago. 2018 08:45, "Steinmetz, Paul" <PSteinmetz@xxxxxxxxxx> escribió:

Jim,

Just curious, why 15K spinny and not SSD.
Cost?
Your performance would be 4x faster with the SSD over 15 spinny.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Rob
Berendt
Sent: Thursday, August 09, 2018 8:31 AM
To: Midrange Systems Technical Discussion
Subject: Re: RAID definition

Doh, forgot about mirroring. We only do that for our VIOS lpars. In their
terminology that would be one 1x1 for one vios lpar and another 1x1 for
the other vios lpar.

283*4 does give you the number quoted. Man, that sure uses up a LOT more
disk than RAID 5 or 6.

Rob Berendt

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