Re: 8203-E4A RAID5 vs. ASP protection

The performance was due to an underperforming card, not the number of drive
units. Quickly fixed with Software if I remember it.
But the limit was 4 units until relatively recently. (don't remember when
it changed since we moved to SANs long ago)

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Fri, Mar 1, 2024 at 9:30 AM Rob Berendt <robertowenberendt@xxxxxxxxx>
wrote:

Forgot about that.
Didn't early on it would allow you to use a 3 drive raid set but it was
SIGNIFICANTLY slowed?

On Fri, Mar 1, 2024 at 10:25 AM Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx>
wrote:

The answer to your question is: with that system I'm certain ( could be
wrong, it's been awhile) the RAID card needs four drive units, and will
not start RAID with 3 units. That came a bit later with more advanced
controller cards. So no, you could not do that.
--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On Fri, Mar 1, 2024 at 9:19 AM Rob Berendt <robertowenberendt@xxxxxxxxx>
wrote:

Isn't another option to IPL into DST, turn off RAID, then turn RAID

back

on

and just leave off the offending disk?

On Thu, Feb 29, 2024 at 10:39 AM Patrik Schindler <poc@xxxxxxxxxx>

wrote:

Hello Jim,

Am 29.02.2024 um 16:20 schrieb Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx>:

Yup, the asterisks just show the drive is not added to an ASP (of

any

type). In order to remove that drive from the RAID set, you would

need

to

manual IPL into DST.

That's what I want to try out next.

I’m not sure which controller you have but back in the day the

minimum

number of drive units was four, so I doubt it will let you remove

that

drive from the RAID set.

SST says, it's a 57B3-001. If I remember right that was some E4A
speciality together with a special backplane.

Hope not being a strategy is an axiom, but here’s hoping your

system

does not go castors up until after it’s no longer needed…

I know and I'm aware. This is a deliberate decision carefully

considering

the relative importance of the system. I promise I will not complain

if

things break. ;-)

:wq! PoC

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