[horde] Bottleneck ? CPU or HDisk IO or RAM

[Linux Advocate]

Eric,

> > perc raid controller, pci-e. a raid 5 config.
> 
> I recently tested a Perc 6/i with SATA and RAID-10 was by far the best
> performance for simulated mail applications like IMAP.  RAID-5 was
> a lot slower.  You might want to consider this...

Thanx. will definitely do this. others here have said the same.

> Yes, disk numbers are an issue (you might use 1 disk for system and read-only
> stuff, 1 for hot spare, 4 for raid-10, for example).

i think i will just do one big raid 10 ( all 6 of the disks ) and allocate max space for the /var/mail partition.

> You can also gain performance via partitioning the drives into a smaller,
> first partition and striping that partitions with raid-5 instead of striping
> the whole disk.  Then use the remaining partition for another less-used
> raid-5 (backups, etc).  The idea is you reduce seek time on the first
> partition to speed things up, and also provide improved caching, though
> this means the other partition(s) must be lightly used or else seeking
> to them and caching from them will put you right back to where you started.
> This would be an advanced topic... :)
> 
> But again, you only say perc, not which perc, so your mileage may vary.

its  a  perc6.

Regards,
marco.

p/s : what hardware do u use and how may users do u support?