Luns on outside half of disk drives for higher performance

Hi,
I undrestand that luns created on outside half od disks drivers can produce better performance.
in my case we have NAS,connection type iscsi, 5x 1TB disks. and RAID5.
the question is if I create x 1TB or x200GB luns, in term of performance of luns, how much discrepancies should i expect? would you say more or less than 5%? comparing the slowest lun to fastest one in each senario .

This caught my eye <http://www.barefeats.com/hard100.html>
but then read they haven't incorporated a 64-bit EFI driver for 2008 MacPro's to boot from externals and isn't port multiplier aware.
This seems to be SATA only, not SAS. Click on "E8 ML" in:
<http://www.hptmac.com/US/product.php?_index=43&viewtype=enclosure&company=Enhan ce%20Tech#>
None of the boards you list have batteries, so if you use caching for RAID 5 or 6, you will need a UPS to avoid data loss if power fails. Without caching, writing will be very slow.
Port multiplies limit the data rate, so wouldn't be used for the highest performance systems.

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www.info.apple.com/support/oldersoftwarelist.html
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/System/Mac_OS_8.1_Update/Disk_Tools_PPC.img.bin
http://download.info.apple.com/Apple_Support_Area/Apple_Software_Updates/English -North_American/Macintosh/Utilities/Disk_Copy/Disk_Copy_6.3.3.smi.bin
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Boilerplate text:
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http://forums.adobe.com/thread/375776
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or
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In daily use: R60F, R500F, T61, T410
Collecting dust: T60
Enjoying retirement: A31p, T42p,
Non-ThinkPads: Panasonic CF-31 & CF-52, HP 8760W
Starting Thursday, 08/14/2014 I'll be away from the forums until further notice. Please do NOT send private messages since I won't be able to read them. Thank you.

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I must be missing something simple here. My Time Machine drive was getting pretty full so I went out and bought a larger drive. I assumed I could copy everything on the old drive to the new one ..then start up Time Machine and point it to the new drive and be in business. Not so. When I tried to copy the contents from one disk to the other the process locked up after about an hour. All activity stopped and I had no files on the new drive. To troubleshoot I simply copied a small folder from the smaller Time Machine drive to the new one..and it copied fine. However I noticed the date on the copied file was current so I assume my process is not a good one anyway as all the dates will be lost. Guess that will screw up Time Machine (after all what is time if its all the same ?). So ..how do I use a new larger drive for Time Machine..without loosing all the old stuff that is already saved. If I just select change disk from the Time Machine panel I assume I will only get backups from now ...and nothing older (from the old disk). I do not want to keep the older disk connected. So what am I missing here ??

Pondini wrote:
And I forgot to add: Disk Utility will do it.
I missed your post this morning.
I looked around and found the keys to get Disk Utility to do it. No $$ needed.
Thanks for the info.
For the rest of the viewers:
*How to change the Time Machine backup disk and migrate the current data to the new disk*:
This procedure performs block transfers, not file-by-file transfers. It avoids all the extended attribute, ACL and hierarchical problems. It just works - it's a Mac!
System Preferences:
..1 - Time Machine:
....1.1 - Turn OFF
..2 - Spotlight:
....2.1 - Privacy:
......2.1.1 add current TimeMachine volume to prevention list
......2.1.2 add new TimeMachine volume to prevention list
Disk Utility:
..1 - Select the target drive in the left pane
..2 - Select Partition tab
....2.1 - Volume Scheme: *1 Partition*
....2.2 - Options: *GUID Partition Table*
....2.3 - Select Apply -> Partition
..3 - Select Restore tab
....3.1 - Drag source Volume into Source window
....3.2 - drag destination Volume into Destination window
....3.3 - Check box: *Erase Destination* ( +this is the critical step+ )
....3.4 - Click Restore button (Wait for transfer to complete, minutes to hours depending on size & disk connections)
The source and destination volumes will now have the same name. Change the volume name(s) as desired.
System Preferences:
..1 - Spotlight:
....1.1 - Privacy: add new TimeMachine volume to prevention list
..1 - Time Machine:
....1.1 - Turn ON
Done!

Luns on outside half of disk drives for higher performance

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