DA Morgan apparently said,on my timestamp of 13/06/2005 1:00 PM:
> VC wrote:
>
>> It appears that the situation is not altogether bleak, even in the
>> Unix world ;) The SUN volume manager tries to do something about
>> improving mirrored read performance:
>
>
> It also eats about 30% of CPU from what I've seen. Gain here ... lose
> there.
Yes, that is one of the major problems: that fine a degree of IO control
doesn't come off thin air! Using an expensive main system CPU/memory to
do it is IMHO asking a bit too much. I'm a great believer in putting the
processing power near where it's needed. So, if one wants to exercise
an extensive control over sequence of disk operations, one better be prepared
to put plenty of CPU and software power near those disks. Oh wait!: that is
*exactly* what SANs were initially designed for! ¦)
--
Cheers
Nuno Souto
in sunny Sydney, Australia
wizofoz2k_at_yahoo.com.au.nospam
Received on Sun Jun 12 2005 - 23:11:10 CDT
