RE: RAID in Exchange

  • From: "Boed Yun" <boedy@xxxxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Mon, 18 Nov 2002 08:30:41 +0700

MessageDear all,
Thousands of thanks you guys. Thanks Andy, it's really enlightening me. 


  ----- Original Message ----- 
  From: Andrea Coppini 
  To: [ExchangeList] 
  Cc: boedy@xxxxxxxxxxxxxx 
  Sent: Sunday, November 17, 2002 10:48 PM
  Subject: [exchangelist] RE: RAID in Exchange

  Again, you guys battle out between yourselves and never answer the original 
  in response to your questions:
  1>  where is the hard disk controller located?
  A>  you don't really need to know, do you? :-)  All you need to know is that 
all mainstream motherboards always have 2 IDE channels (primary and secondary) 
to which you can attach up to 2 devices each (master and slave), so you have a 
max of 4 devices in total.  A 'device' can be a hard disk or a 
CD-ROM/DVD/CD-Writer or a backup device such as a tape streamer.  There is no 
RAID here.
  Now, there are cards available (such as from 'Promise' or 'Adaptec') which 
provide you with IDE RAID.  These cards vary in the number of 'channels' and 
the type of RAID they support.  All have at least 2 channels, which is needed 
to support RAID1 (mirror).  Some larger models have 4 or 6 channels, which 
allows you use RAID5.  For a better description of RAID and the different 
versions, go here: or here:
  In your case, if you want to build a low-cost Exchange server you might look 
into the following hard disk configuration:
  motherboard - Primary Channel
  ------- Master:   CD-ROM/DVD
  ------- Slave:     [nothing]
  motherboard - Secondary Channel
  ------- Master:   Tape Streamer for backups
  ------- Slave:     [nothing]
  RAID Card (eg.
  Primary channel
  ------ Master:   Hard Disk 1
  ------ Slave:     [nothing]
  Secondary Channel
  ------ Master:   Hard Disk 2
  ------ Slave:     [nothing]
  Tertiary channel
  ------ Master:    Hard Disk 3
  ------ Slave:      [nothing]
  Quartiary (?) channel
  ----- Master:    Hard Disk 4
  ------ Slave:     [nothing]
  This way, you can set up a RAID1 set using Hard Disk 1 and Hard Disk 2 to 
store your Windows installation and the log files, and a separate RAID1 set 
using Hard Disk 3 and Hard Disk 4 for the mailboxes.
  As for your second question:
  2. In my IDE Controller there is primary , secondary (both with master and 
slave) , if I have 4 harddisks and I put them all on the IDE Controller . Does 
it mean I have four different harddisk controller and can have better 
performance if I put in one of them ?
  The only way to introduce a bottleneck in an IDE system is by having a 
CD-ROM/DVD/Tape Streamer on the same IDE channel as a hard disk.  Doing this 
will slow down access to the hard-disk.  As long as you keep your CD-ROMs and 
other non-hard disk devices on their own IDE channel (they can be on the same 
controller card or motherboard), you won't have any problems.
  Hope this clarifies your ideas.  Let me know if you need more info.
  To conclude, I would heavily recommend asking a professional for help, since 
you don't seem to have very clear ideas about what you want and how to go about 
doing it.  In the meantime, take Jeffrey Adzima's suggestion to buy a few PC 
bits and pieces and learn by doing and screwing.
  PS: for all the boasting know-alls on the list.  I KNOW and have willingly 
left out a number of specifics and exceptions, so keep your flames to 
yourselves.  Flooding a newcomer with all your knowledge will only confuse the 
guy.... but then, that might be exactly what you're trying to achieve, since 
one day a newcomer might take your job...

Other related posts: