[cisco-voip] Drive Mirroring

[Matt Slaga (US)]

My suggestion:

 

Call IBM support and tell them what you are seeing.  Maybe there is a
setting that can be adjusted.

 

 

 

From: CarlosOrtiz at bayviewfinancial.com
[mailto:CarlosOrtiz at bayviewfinancial.com] 
Sent: Friday, February 16, 2007 10:38 AM
To: Simon, Bill
Cc: cisco-voip at puck.nether.net; cisco-voip-bounces at puck.nether.net; Matt
Slaga (US)
Subject: Re: [cisco-voip] Drive Mirroring

 


That is good to know but might not help us much.  We typically are doing
this while the system is still up to prepare for an upgrade or
something. 

Carlos 



"Simon, Bill" <bills at tns.its.psu.edu> 

02/16/2007 10:22 AM 

To

CarlosOrtiz at bayviewfinancial.com 

cc

"Matt Slaga (US)" <Matt.Slaga at us.didata.com>,
cisco-voip-bounces at puck.nether.net, cisco-voip at puck.nether.net 

Subject

Re: [cisco-voip] Drive Mirroring

 

		




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?






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