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What RAID level handles four drives?

post #1 of 10
Thread Starter 
I have the LSI MegaRAID 9265-8i controller and considering using it with four SSD drives, what RAID level would this considered to be? From the specifications the LSI MegaRAID 9265-8i handles RAID 0, 1, 5 & 6.

Thanks.
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post #2 of 10
All of those can.

Do you know what each one is?

Read this: http://www.overclock.net/t/484367/guide-all-you-ever-wanted-to-know-about-raid
post #3 of 10
All of those are capable of handling 4 drives. You can also use RAID1+0.

I suggest RAID5. You will get the performance of 3 drives and any one of them can fail without issue. With RAID6 any 2 drives can fail, performance of 2 drives. With RAID0 performance of 4 drives, none can fail. RAID1 performance of 1 drive, 3 can fail. RAID1+0 (RAID10) performance of 2 drives, only one can fail in each set.

Run RAID5 thumb.gif
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post #4 of 10
RAID 5 would be best for four drives. If you need more security or performance, more disks and RAID 6 should be used.

RAID 6 is nice in a server setting, if you have a drive failure, you can rebuild the array even if a second drive dies during the rebuild.

RAID 1 for two disks and a need for redundancy, it's basically like having a dynamic backup. Write performance is similar to one disk, but read performance on good controllers actually benefits on large files, as the controller can read a part of the file from each of the drives.

RAID 0 for two disks, or more if all you want is performance and don't care about the data involved.
Edited by Mootsfox - 3/21/12 at 11:13pm
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post #5 of 10
Thread Starter 
I'm familiar with RAID 0 and RAID 1, but not the other levels. I'll study the link provided, but it sounds like RAID 5 is the way to go. Many thanks for your help.
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post #6 of 10
Thread Starter 
Presumably with RAID 5, you get the performance of three drives, and the capacity of three drives as well? Seems a bit of a waste, an entire 256GB SSD purely for redundancy.
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post #7 of 10
Quote:
Originally Posted by aln688 View Post

Presumably with RAID 5, you get the performance of three drives, and the capacity of three drives as well? Seems a bit of a waste, an entire 256GB SSD purely for redundancy.

Basically. If your data is not important (games, swap space, etc) and replaceable, then go with RAID 0 as it is the pack leader in speed. RAID 5 and 6 allow for excellent speed (though slower than RAID 0), reliability and scalability.
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post #8 of 10
Different setup for different scenarios, what will this be used for? Database, File server, gaming and work, encoding and ripping, it really depends on what you are going to be doing..

I have 2 rigs.. for my gaming and primary workstation which I use for heavy multi tasking, gaming and whatever I feel like throwing at it... OCZ boot, Raid 1 Intel ICH10 for back up and storage...

for my server which is a database, file server, ripping and encoding... M4 boot, Raid 5 (using 4x mechanical drives) on LSI 9265-8i

Synology NAS raid 0 for backup only...


I wouldn't raid 5 SSD's on a boot drive unless it's production related, Raid 0 and Windows backup or whatever "clone" software of your choice is the way to go.. If my SSD failed for whatever reason, I can do backup and run my restore scripts and be back up and running in less then 20 minutes...
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post #9 of 10
Thread Starter 
The plan is to RAID 4 x 256GB SSDs and use it for Window's and data, with the data being backed up on an external drive. The use is varied - boot, software development, gaming, graphics design, database server, etc. I don't want any spinning HDD in my system, not on this build.
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post #10 of 10
If you're backing up data (and the occasional system image, perhaps?) then just go RAID 0. Bear in mind though, that RAID 0 will only get you faster sequential performance. Random access activity from the OS won't be much faster than a single SSD - they already have a response time of 0.1ms. tongue.gif
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