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PERC 5/i RAID Card: Tips and Benchmarks - Page 413

post #4121 of 7276
hi guys!

after moving some drives around, my RAID5 array is detected as foreign.
i the raid0 is still there and i have checked that the cables are in the correct order and seated correctly but the array shows as foregn every time

i have tried importin and it fails with an "unknown error"

any ideas?

Regards
post #4122 of 7276
In my opinion the Perc 5/i supports only stripe sizes till 128K.. I´m using the Dell-Firmware on my controller.
post #4123 of 7276
Quote:
Originally Posted by opty165 View Post
Yea, i think in the future it's just going to be filled with HD everything lol. Thanks for the advice!
honestly, changing stripe size is really not worth it. If you were running your OS on the array it is worth getting it right, but for storage the actual differences are minimal. I wouldn't bother re-creating the array (especially if it will cause a hassle) - for streaming media etc you won't see much difference, especially if all your usage is over a network connection.

I really wouldn't be running a RAID0 storage array with no backup option though...
post #4124 of 7276
Quote:
Originally Posted by the_beast View Post
honestly, changing stripe size is really not worth it. If you were running your OS on the array it is worth getting it right, but for storage the actual differences are minimal. I wouldn't bother re-creating the array (especially if it will cause a hassle) - for streaming media etc you won't see much difference, especially if all your usage is over a network connection.

I really wouldn't be running a RAID0 storage array with no backup option though...
I see differences to the tune of 100MB/sec read

True, playing a movie file wont ever take up that kind of bandwidth. But, copying between 2 separate RAID arrays it makes a pretty big difference.

Although, he wont be really utilizing that.
    
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post #4125 of 7276
Quote:
Originally Posted by DJZeratul View Post
I see differences to the tune of 100MB/sec read
Not on a 3-drive array you don't...
post #4126 of 7276
Quote:
Originally Posted by the_beast View Post
Not on a 3-drive array you don't...
Just speaking to personal experience

But yeah. You have a point.
    
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post #4127 of 7276
hi

Finally I've made backup of my 130GB RAID5 array and I'm ready for some overhauling

My current config is: 2x 160GB (mirrored) by on-board second/extra controller (not ICH10R) - C: 80GB (boot, system Vista64bit) and D: 70GB (data) - no changes in here

And I have 5x SAS 36GB 15K rpm drives configured as RAID5, which I would like change to:

a) 6x 8GB as RAID0 - for VirtualPC, 1.6GB Thunderbird profile, system temp, FireFox cache,
b) 6x 15GB as RAID5 - for my sensitive data (client's documents - 5 to 50MB files - no movies) - which will be copied to D: every day
c) 6x (what's left) as RAID10 - maybe for Win7 and maybe for backup of VirtualPC from a).

And now is the question what stripe size should I set for each RAID volume and later - what sector size in system ?

a) I think bigger will be better I know "temp" and FF "cache" contains many small files - but VirtualPC is most important,
b) 64KB stripe and 8KB sector - like I have now ?
c) 64KB stripe xxKB sector ?

No system SWAP because I have 8GB RAM and everything works perfectly fine without it

thanks in advance

===========================

ok, problem "solved" ... you can't split same physical drive for two different RAID levels ... but ICH10R can do this ... so now I have 4 drives as RAID5 and 2 drives as RAID0
Edited by RobiNet - 3/5/10 at 2:02pm
post #4128 of 7276
So I did a pretty good job of filling my 4x1.5TB RAID 5 (4.5TB usable, 1.5TB parity) array and purchased a 5th drive. I can't for the life of me figure out how to expand the array to include the new drive, though. I'm running Ubuntu 9.10 (Karmic Koala) and have referenced the following guides:

http://linux.dell.com/repo/hardware/latest/ (useless)
http://ccn.ucla.edu/users/jkyle/webl...Ubuntu_64.html
http://ubuntuforums.org/showpost.php...2&postcount=54
http://support.dell.com/support/edoc...html/index.htm

I'm pretty sure what I need to do is run the command:

Code:
omconfig storage vdisk action=reconfigure controller=0 vdisk=0 raid=r5 size=6000000m pdisk=0:0,0:4,0:5,0:6,0:7
but when I try do so I get "Error! cannot load data accessor:"

Any help would be appreciated...
Edited by EvilGenius007 - 3/7/10 at 11:55am
    
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post #4129 of 7276
Quote:
Originally Posted by EvilGenius007 View Post
So I did a pretty good job of filling my 4x1.5TB RAID 5 (4.5TiB usable, 1.5TiB parity) array and purchased a 5th drive. I can't for the life of me figure out how to expand the array to include the new drive, though. I'm running Ubuntu 9.10 (Karmic Koala)
Why you don't use MegaCli for Linux:

http://www.lsi.com/storage_home/prod...#Miscellaneous

In corresponding readme.txt you will find list of all commands.
post #4130 of 7276
Hello there!

I've been testing my PERC 6i with two seagates 80GB SATA1. I had those two disks on a ICH5-R RAID0 (that's socket 478 era ) that used to work flawlessly. Right now I have no cash to get some WD RE2 or RE3 beauties ...so I had the PERC sitting around until I save up enough.

I made backup from those 80gb drives and then I started playing around with the PERC. I've read that the Dell PERC requires SAS or SATA2 disks... but the LSI chip states that its also SATA1 compatible.

I've been able to create RAID1 and RAID0 arrays with the two disks, I've been able to initialize the arrays and use them in windows. The results where quite strange:
Be it write back or write through, I had write speeds starting from 75MB/s and then dropping to 45MB/s stable.

the 'test' was a mere windows file copy. In this case, a 30GB acronis hard drive image. Speeds reported by windows server 2008 copy window details...

I know those two drives were faster on the ICH5-R so I'm wondering if this is the card's fault (SATA1 support?). I remember when I first got the card a few months ago, I run quite a few tests with a single 250GB sata 2 disks that sustained +110 MB/s write speeds.

another matter: I also tried building up a RAID1 array (2x80) and run a consistency check to see how slow it was, but it actually took ~30 minutes to finish. I was wondering... are the consistency check times similar to rebuild times?
What about RAID5? Those of you (lucky) guys that enjoy your RAID5 arrays!! How much time does it take to make a rebuild? I'm just curious..

Thanks again for all Your tips and help
Regards!!
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Volfied
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