Re: Fw: IBM i Disk system statistics

[DrFranken <midrange@xxxxxxxxxxxx>]

Hot spare came with V5r4M5 - M5 being the key.

Not all RAID cards supported it but the 'large cache' ones did. Hot 
spare for Mirroring came later.

You can have a bunch of hot spares but remember for the LOAD SOURCE raid 
set at least ONE hot spare MUST be in a bootable location and with SCSI 
that's the first two or three slots. If not then it's not eligible to 
replace the Load Source and thus it's more of a warmish spare and not so 
valuable.

I have one machine across the state that I maintain and I have four hot 
spares in there. If one or two are down I don't have to worry and can 
replace them next time I'm there.

Hot spare are also 'Per Controller (pair)'  So say you had 0595 drawers 
you could have 10 real and 2 hot spare even with 2 RAID sets in there 
for example.

        - Larry "DrFranken" Bolhuis

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

On 11/28/2018 11:27 AM, Rob Berendt wrote:
> Did they support "hot spare" back then?
> How many "hot spare" drives are supported per raid set?
>
>
> Rob Berendt