Re: RAID definition

[DrFranken <midrange@xxxxxxxxxxxx>]

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