Re: Mixing Disk Drives? -- MIDRANGE-L

Thanks Larry. I was afraid that the answer would be something like that.
It's especially bothering considering the fact that I just put in a new
4326.


On 3/20/06, Larry Bolhuis <lbolhuis@xxxxxxxxxx> wrote:
>
> Ron,
>
> The existing disks are correct. Because IBM puts RAID stripes on 2, 4,
> or 8 drives and you have seven, the first four have RAID strips cutting
> their usable capacity by 25% each. The others benefit from RAID
> protection but are not reduced in size. Thus they are at the full 35GB
> size.
>
> Adding 70GB Drives is OK but you will need to add at least two to
> start but they would need to be mirrored or you'll be unprotected. You
> COULD add three to form a the minimum sized RAID set but this would
> perform very poorly as the drives would show up as 35GB 35GB and 70GB.
> This configuration just isn't recommenced for production systems. I
> would add a minimum of four of them to form a better performing RAID
> set. Of course these won't go into the 520 itself because that holds
> only 8 drives so you'll need some sort of expansion unit to hold them
> and RAID card to drive them. This opens up an entire new line of things
> to consider.
>
> Hope this helps!!
>
>    - Larry
>
> Ron Adams wrote:
> > I've got a couple of questions regarding the disks in my 520.
> >
> > First, I've got 7-4326 (35gb) drives installed all into one ASP and it
> is
> > running RAID-5. The first 4 show their size in WRKDSKSTS as 26373, the
> next
> > 3 show 35165, is this correct, or does it mean something's not
> configured
> > correctly?
> >
> > Second, I've just realized that our disk usage requirements are growing
> much
> > faster than originally anticipated. I am looking at buying a couple of
> 4327
> > (70gb) disk drives. Will I be able to add these into the system as-is?
> Or,
> > will I need to make some changes? Can I get by with just adding 1, or
> will I
> > have to add 2 or more?
> >
>
> --
> Larry Bolhuis                   IBM eServer Certified Systems Expert:
> Vice President                    iSeries Technical Solutions V5R3
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>
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>
>
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