[horde] Bottleneck ? CPU or HDisk IO or RAM

[Linux Advocate]

Andy, 

A. supposing its two boxes of Dual Core Dual Xeons, 8GB RAM and 7.2k rpm 750 GB SATA 
disks ( 6  or more ) in a RAID10, i.e one for horde, one for imap/pop/webmail ,will the 7.2k rpm sata drives cut it ? since imap is hard disk i/o intensive ( as mentioned in one of the posts here ) ? 

B. ok,, i will enable memcache and experiment and report back. i have never used it before.

C. What hardware do u use and how many users do u handle? 

> 
> > Guys, just wondering. For a horde groupware webmail edition, what will be the 
> bottleneck if there are about 1000 users? The CPU ? or the HDisks?
> > 
> > Will a new box with Dual Core Dual Xeons, 8GB RAM and 7.2k rpm 750 GB SATA 
> disks ( 6 )  be sufficient? Anybody here got some sample specs of some running 
> machines with the groupware?
> 
> Horde itself will be limited by memory and CPU, assuming your IMAP server is 
> running on a separate server.  The specs you list above should be a good 
> starting point for Horde, depending how you tune it.  I recommend memcache as 
> your session storage backend for Horde.
> 
>     Andy

regards,
marco