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Sean's Windows 7 Install & Optimization Guide for SSDs & HDDs - Page 32

post #311 of 5386
Here's some interesting info. Sean had asked about a RAID installation guide. not quite ready to write one up yet, but some interesting stuff. The only thing I can glean from this at the moment, is never...never...NEVER...NEVER let windows do your partitioning for GPT on a RAID 0 Array. It does seem however, that window 7 install does do a good job at aligning partitions like Microsoft claims it will.

The benchmarks were run using 2 Corsair Performance 3, 128GB drives attached to an Intel P67; SATA 6gb/s ports.

I have a lot of these, as each install was done 5 times and the AS SSD benchmark was run immediately after a windows install. I noted no discernible difference between the benchmarks with the same type of install and stripe size. You will see the minimal (I believe a standard margin of error) variance between most of the benches, other than as noted on the GPT sequential write). The RAID was broken, and the drives secure erased with Parted magic between each install. For the Windows alignment, windows 7 was installed to a blank unallocated disk, and the install program handled the partitioning and formatting.

Look at the sequential writes on a GPT disk. This was consistant regardless of stripe size.

GPT Partitions RAID 0; 64K stripe:

Windows aligned


4096 aligned


MBR partition RAID 0; 128K stripe

This gets a little hairy, because a windows aligned drive consistently produced better results at all stripe sizes ranging from 8K to 128K (the Intel oprom max stripe size is 128K). I think the differences of windows alignment vs. manual alignment is substantial enough to call it outside the standard deviation, so I'm not convinced (at this point) that manual alignment is the way to go on a RAID 0 Array. More testing/ analysis is still needed.

Windows aligned


4096 aligned


8192 aligned






Edited by xandypx - 11/6/11 at 10:17am
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post #312 of 5386
relink the pics.
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post #313 of 5386
so it looks like a MBR disk is better overall.
Edited by firestorm1 - 11/6/11 at 10:32am
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post #314 of 5386
Thread Starter 
SO this is or isn't windows aligned? I see it says 1024k, that usually is a manual alignment...
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post #315 of 5386
Quote:
Originally Posted by Sean Webster View Post
SO this is or isn't windows aligned? I see it says 1024k, that usually is a manual alignment...
Depends if he used it as OS drive.
post #316 of 5386
Thread Starter 
Quote:
Originally Posted by XSCounter View Post
Depends if he used it as OS drive.
i forgot

EDIT: BUT HE SAID THEY WERE DONE AFTER EACH INSTALL.

stupid caps lock lol
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post #317 of 5386
Sean, thanks for the guide. I have most of this info scattered throughout lots of other guides I've found, but you've put it all together and added a thing or two.

One question, I'm just about to reinstall windows because of a motherboard and cpu upgrade. I'm looking at the alignment issue. I think I let Windows align it last time. I would like to try the 4096 alignment this time. However, I have another ssd and two mechanical hard drives in the system. Will those be OK? Or will they need realignment? Thanks, and +rep.
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post #318 of 5386
Thread Starter 
Quote:
Originally Posted by breenemeister View Post
Sean, thanks for the guide. I have most of this info scattered throughout lots of other guides I've found, but you've put it all together and added a thing or two.

One question, I'm just about to reinstall windows because of a motherboard and cpu upgrade. I'm looking at the alignment issue. I think I let Windows align it last time. I would like to try the 4096 alignment this time. However, I have another ssd and two mechanical hard drives in the system. Will those be OK? Or will they need realignment? Thanks, and +rep.
Thanks!

They will be fine, you don't need to align them.
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post #319 of 5386
Quote:
Originally Posted by Sean Webster View Post
Thanks!

They will be fine, you don't need to align them.
Thanks for the quick reply, +rep. One more thing, I put my user profiles on another partition on a mechanical drive. I assume that's fine, too?
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post #320 of 5386
Thread Starter 
Quote:
Originally Posted by breenemeister View Post
Thanks for the quick reply, +rep. One more thing, I put my user profiles on another partition on a mechanical drive. I assume that's fine, too?
You can set it up how ever you want. I have my user folders like the pictures, documents, videos, and such on my mechanical drive.

If you followed the guide by another member on here to move the whole folder itself during install that is fine too. I prefer to have my appdata folder on the SSD though.
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