[cisco-voip] Drive Mirroring

[Simon, Bill]

What we found on HP is if you mirror when the OS is halted (e.g. go into 
the RAID BIOS screen on startup) it cuts down the time by at least half.

The extra disk I/O involved with a running OS (and apps) slows it down 
considerably.  Same might be applicable to IBM.

CarlosOrtiz at bayviewfinancial.com wrote:
> 
> Hard to believe in this day and age you would have such a performance 
> gap on comparable servers.   Maybe someone has found a way to cut it 
> down a bit.
> 
> Carlos
> 
> 
> Most of this is due to processor time.  HP has always been way ahead of 
> the curve compared to IBM with offloading most processor requirements 
> onto the RAID card.  Another reason I prefer compaq servers over big blue.
>  
>  
> 
> After working with the HP MCS servers and IBM MCS servers we have found 
> a HUGE difference in rebuild time for mirrored drives.    The HP's 
> usually rebuild in about 20-30 mins.  The IBM's take about 5 hrs.  Is 
> there anything that can be done to speed up the IBM process? Are there 
> any known issues?