Re: To use SAME or NOT for High End Storage Setup ?

On 5/11/06, Connor McDonald <mcdonald.connor_at_gmail.com> wrote:
>
>
>
> On 5/11/06, Kevin Closson <kevinc_at_polyserve.com> wrote:
> >
> > Well, it is my opinion and experience that with the type of
> > HW you have, you should create a SAME volume of max at
> > least 1MB stripe width tht consists of all the LUNS (each being
> > RAID1+0 themselves).
> >
> >
>
> Maybe volume managers have improved since I last used them in anger, but
> my only concern with that approach is the ongoing growth. That is, you've
> got (say) 100 disks over which your volumes are all striped, but then
> management says "you can have 4 new disks each week/month/year" for growth.
> Such a finanically-imposed policy, resulted in a nice humming batch of
> 100-disk-stripe volumes on day 1, plus an ever increasing number of cruddy
> 4-disk-stripe volumes, which you had to fill before management would cough
> up some dosh for another 4.
>
> Do vol mgr's nowadays have the ability to "rebalance" the volumes ala ASM
> to avoid this? And if so, presumably you're still up for a nasty IO spike
> whilst it occurs ?
>
> Cheers
> Connor
> --
> Connor McDonald
> ===========================
> email: connor_mcdonald_at_yahoo.com
> web: http://www.oracledba.co.uk
>
> "Semper in excremento, sole profundum qui variat"
>

and I just to add, my current client's sys admin built all their (raw) database volumes as concat's not stripes, because "it made adding disk easier"...Anyone know if Veritas can convert these to stripes without a monster outage to shift all the stuff around.

Surprise, surprise this client has IO headaches (read: hot spots) , but are claiming "its all too late now - we can't change"..

-- 
Connor McDonald
===========================
email: connor_mcdonald_at_yahoo.com
web:   http://www.oracledba.co.uk

"Semper in excremento, sole profundum qui variat"

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