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PERC 5/i RAID Card: Tips and Benchmarks - Page 438

post #4371 of 7150
Total BS. I bought a perc 6i card. You can't do s..t with it, nothing close to intel matrix. When you create a raid 0 array of any size, the remaining space could be allocated ONLY for RAID 0, that option is grayed out. Damn, i thought it's possible, why to write BS like that, I don't understand....
Now I'm f..ed with this card. I don't need a raid 0 array of 4TB size, I have no other drives to back that up every week onto. I wanted a compromise between speed and redundancy - not possible with the card. F. I'm so pissed at myself for listening.



Quote:
Originally Posted by the_beast View Post
I can confirm that you can do this - I messed about with it before I set up my 'proper' storage array. In fact the PERCs are much more flexible than Matrix RAID - I believe (according to the Intel docs) that ALL drives used in one array MUST be used in ALL arrays spanning those drives. With the PERCs you could (for example) set up an 8-drive RAID0 using 10% of each disk, then use the remaing space on 4 of the drives in RAID10 and the other drives in RAID5. This is not possible on Intel's controller (again according to the docs - I haven't tested it).

Not sure why you would want to do this though - the performance of both arrays will suffer is you try and use both simultaneously.

And I agree with the comment about RAID6 for 1TB+ drives. Even if you knock 80GB (ie less than 10%) off the capacity/disk in your array, you are still way too likely (IMO) to encounter an URE during a rebuild of a RAID5 with such large disks, and such an event can result in the loss of all your data.

Edited by IdleWild - 6/17/10 at 7:10pm
post #4372 of 7150
Quote:
Originally Posted by IdleWild View Post
Total BS. I bought a perc 6i card. You can't do s..t with it, nothing close to intel matrix. When you create a raid 0 array of any size, the remaining space could be allocated ONLY for RAID 0, that option is grayed out. Damn, i thought it's possible, why to write BS like that, I don't understand....
Now I'm f..ed with this card. I don't need a raid 0 array of 4TB size, I have no other drives to back that up every week onto. I wanted a compromise between speed and redundancy - not possible with the card. F. I'm so pissed at myself for listening.


In related news, you can create as many virtual disks as you want on your physical disks... so if you made a VD with a RAID0, you could make a second VD with a RAID-whatever-you-wanted.
    
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post #4373 of 7150
Yeah, right. Maybe you make screenshots and show me step by step? You cannot create a second VD of "whatever you want" from a\
emaining space, it's gonna be locked to "whatever you created using initial space". I've spent 2 hours on trying to justify the purchase of the adapter but I couldn't I wish I'd be doing something wrong, but I'm not. It's impossible in BIOS and in dell sas raid manager, and even in latest LSI megaraid manager. If you don't understand what exactly I'm trying to do please refrain from commenting. You can create ANY WHATEVER raid level by selecting NEW HDDs, but not remaining space.
Even Bush would do it right, there's really nothing you can do to make it wrong LOL, there's only ONE option when you select remaining space, and it's to create new VD, and in the new VD you can no longer select RAID level.



Quote:
Originally Posted by DJZeratul View Post


In related news, you can create as many virtual disks as you want on your physical disks... so if you made a VD with a RAID0, you could make a second VD with a RAID-whatever-you-wanted.

Edited by IdleWild - 6/17/10 at 9:28pm
post #4374 of 7150
Quote:
Originally Posted by IdleWild View Post
Yeah, right. Maybe you make screenshots and show me step by step? You cannot create a second VD of "whatever you want" from a\
emaining space, it's gonna be locked to "whatever you created using initial space". I've spent 2 hours on trying to justify the purchase of the adapter but I couldn't I wish I'd be doing something wrong, but I'm not. It's impossible in BIOS and in dell sas raid manager, and even in latest LSI megaraid manager. If you don't understand what exactly I'm trying to do please refrain from commenting. You can create ANY WHATEVER raid level by selecting NEW HDDs, but not remaining space.
Even Bush would do it right, there's really nothing you can do to make it wrong LOL, there's only ONE option when you select remaining space, and it's to create new VD, and in the new VD you can no longer select RAID level.
When I order my new drives, I'll make a step by step. Unfortunately I cant do anything right now as I don't have any free disks to make a new array from.

I am pretty positive that this is possible.

Also, it helps to not be rude when posting, you will generally get a much better response this way. My reply to you was somewhat facetious because your original post was very rude, especially to the_beast who is a very well respected member of this thread. This is a place for collaboration, there is no need for rude comments and abrasive "suggestions"...
Edited by DJZeratul - 6/17/10 at 11:21pm
    
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post #4375 of 7150
Ok. I verified on the precision T3500 machine and couldn't make any of the 2 different RAID levels on perc 6i card unless you select 2 HDDs for raid 0 and 2 other HDDs for raid 1 etc. If you select raid 5 or 10 you can just partition it into several partition of the same raid level. So I would say that it is worse to give somebody information that you have little to no clue about than being rude. Unless somebody hacked the card and can share with the rest of the world with the proof of that I confirm that you cannot have multiple DIFFERENT RAID levels on SAME HDDs, where DIFFERENT and SAME are keywords.

Quote:
Originally Posted by DJZeratul View Post
When I order my new drives, I'll make a step by step. Unfortunately I cant do anything right now as I don't have any free disks to make a new array from.

I am pretty positive that this is possible.

Also, it helps to not be rude when posting, you will generally get a much better response this way. My reply to you was somewhat facetious because your original post was very rude, especially to the_beast who is a very well respected member of this thread. This is a place for collaboration, there is no need for rude comments and abrasive "suggestions"...

Edited by IdleWild - 7/30/10 at 9:24pm
post #4376 of 7150
Thread Starter 
Quote:
Originally Posted by IdleWild View Post
Total BS. I bought a perc 6i card. You can't do s..t with it, nothing close to intel matrix. When you create a raid 0 array of any size, the remaining space could be allocated ONLY for RAID 0, that option is grayed out. Damn, i thought it's possible, why to write BS like that, I don't understand....
Now I'm f..ed with this card. I don't need a raid 0 array of 4TB size, I have no other drives to back that up every week onto. I wanted a compromise between speed and redundancy - not possible with the card. F. I'm so pissed at myself for listening.
Huh?

You allocate drives to any array to create a logical storage device.
You allocate space to a partition on the logical storage device in the OS.

What storage hardware do you have and what are you attempting to achieve?
Edited by DuckieHo - 6/18/10 at 12:00pm
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post #4377 of 7150
Quote:
Originally Posted by IdleWild View Post
Ok. We verified with the Lab coordinator in the Dell lab on the precision T3500 machine and couldn't make any of the 2 different RAID levels on perc 6i card unless you select 2 HDDs for raid 0 and 2 other HDDs for raid 1 etc. If you select raid 5 or 10 you can just partition it into several partition of the same raid level. So I would say that it is worse to give somebody information that you have little to no clue about than being rude. Unless somebody hacked the card and can share with the rest of the world with the proof of that I confirm that you cannot have multiple DIFFERENT RAID levels on SAME HDDs, where DIFFERENT and SAME are keywords.
What exactly are you trying to do? RAID0 on a portion of the drives... and RAID5 on the rest of the remaining space?

And alleging that we have little to no clue about anything is grounds for me walking away and not continuing to help you. Although i am sure you wouldnt care, because you dont seem to care about anything other than getting your RAID to work... Which, if thats the case, I would be patient and help us help you out by providing some more information in a calm and polite manner. I understand that you are upset and frustrated, but its nerve wracking to deal with someone who is basically calling you an idiot to your face, and with no grounds to do so.
Edited by DJZeratul - 6/18/10 at 12:00pm
    
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post #4378 of 7150
Quote:
Originally Posted by DuckieHo View Post
Huh?

You allocate drives to any array to create a logical storage device.
You allocate space on the logical storage device in the OS.
Oh God, not another one (I'm sorry I do not understand why nobody cannot understand what I try to do). Do you own the card? Have you ever seen the perc6 configuration BIOS? You can specify the RAID size when you create it ok? good. Let's say you have 4x100GB drives. You select all of them, specify raid 0 and size of the VD is 100GB. Now in the disk group tree you'll see something called "Space Allocation" *Free Space * 300GB (real size will be in MB of course). So you select it, hit F2 -you got only one option - add new VD. You hit enter and next screen is your Raid Level - Raid 0 (unselectable), your drives - 4 HDDs (unselectable), VD size - unselectable, advanced settings -selectable (stripe size,read policy,write policy, Force WB and Initialize), than you have OK and cancel. Wasn't hard was it? What ppl are trying to convince me in is that you can distribute *Free Space* for any raid level you like - which is what i called BS (sorry there's no other way to call it in english). You can not period. It's not like Intel matrix raid where you CAN DO it. Same thing will happen if you try to create raids from within OS using sas manager, I tried both dell manager and lsi mega manager. I have dell firmware, I haven't seen anyone running LSI firmware on Perc 6i card in this thread.
So please let's add that valuable informatiion to the sticky in the first post that it is not as flexible as intel matrix raid in terms of setting it up for home usage (small fast raid 0 array for OS and games etc and large RAID 10 array for data storage).


PPS: For anyone who's intersted or not aware please take a loot at this thread which does make sence to a lot of ppl to set it up like that (including me).Since you mostly be accessing OS you'll get the full spead of raid 0, and since you're not going to be copying data back and forth between raid 0 and raid 5 partition theres no perfomance degradation.
http://www.overclockers.com/forums/s...d.php?t=467848


Quote:
Originally Posted by DJZeratul
And alleging that we have little to no clue about anything is grounds for me walking away and not continuing to help you. Although i am sure you wouldnt care, because you dont seem to care about anything other than getting your RAID to work... Which, if thats the case, I would be patient and help us help you out by providing some more information in a calm and polite manner. I understand that you are upset and frustrated, but its nerve wracking to deal with someone who is basically calling you an idiot to your face, and with no grounds to do so.
PS. I'm not calling anyone idiots, but please explain me the reason behind giving ppl information that you have not verified (not specifically you but in general)?
It's very easy to say something like that when you realize that you are not correct right? If you do know how it's done PLEASE share with me (and everybody else) and I'll greatly appreciate that, plus as a bonus I'll admit that I'm an idiot!
Ignore my CAPs please - not yelling but selecting key words...
Edited by IdleWild - 6/18/10 at 12:33pm
post #4379 of 7150
Quote:
Originally Posted by IdleWild View Post
If you do know how it's done PLEASE share with me (and everybody else) and I'll greatly appreciate that, plus as a bonus I'll admit that I'm an idiot!
I will see what I can do. Ive honestly only done what you are trying to do on an Intel Matrix RAID. I am somewhat certain its possible, but like I said, I haven't done it specifically before.

I have about a TB of data on my RAID5 right now and its performance is kind of crap, so I am going to redo it anyway. Once I copy my data and begin rebuilding the array, I will tell you what my findings are.
    
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post #4380 of 7150
I know that what I posted works with the firmware level I had when I bought the card and using the CLI tools to set up the arrays, for the simple reason that I did it. However I didn't leave my card like that for long, simply because it doesn't suit what I use my arrays for.

I don't know whether the setup is possible with the current BIOS revisions, or if it ever was possible using the GUI tools (BIOS or OS based). I should probably have clarified this in my post. If I had a PERC not in active use at the moment I would check it again, although I don't have available hardware at the moment.

My apologies if my post is inaccurate or misleading. I will edit it shortly...
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