Raid 6

Hi

This might be a daft question but if you dont know you have to ask

Is raid 6 covered in the server 2003 exam, how long has it been out, I dont know much abouit it really, is it being adopted by a lot of people at this moment in time

Lee H

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bertieb

Nope.

Raid 0/1/5 knowledge should be fine for the 70-290 exam.

dynamik

It's basically RAID-5 that allows two disks to fail. As bertieb says, it's not going to be on the exam. You're only tested on the software RAID options in Server 2003, so you won't have to worry about it.

Wikipedia has a good write-up on the various levels and their features: http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks#Standard_levels

sprkymrk

dynamik wrote:

It's basically RAID-5 that allows two disks to fail.

Tsk tsk! If 2 disks fail in a RAID 5 you're done. You know that!

Oh wait, you mean that's what RAID 6 is? Wow, you made my eyes pop out for a second there with that wording.

Lee H

So it work in exactly the same way as Raid5 but with greater redundancy

astorrs

Lee H wrote:

So it work in exactly the same way as Raid5 but with greater redundancy

At a high level yes. At the "how it's actually done level" not even close. The math involved is significantly more complex than that of RAID-5 and the most common implementation (there are 4 different RAID-6 algorithms I know of) is based on Reed-Solomon encoding and involves Galois field algebra.

sprkymrk, following our previous RAID-5 performance thread, the math required to calculate the write parity on RAID-6 is nuts and the rule of thumb usually says a penalty of 5-10% for sequential workloads and 25-35% for random workloads worse than RAID-5.

Lee H

the math required to calculate the write parity on RAID-6 is nuts and the rule of thumb usually says a penalty of 5-10% for sequential workloads and 25-35% for random workloads worse than RAID-5

Straight over my head there buddy

dynamik

This might fill you in a bit: http://www.techexams.net/forums/viewtopic.php?t=35676

Astorrs, you can't be bothered to provide a link? Quit slacking!

astorrs

dynamik wrote:

Astorrs, you can't be bothered to provide a link? Quit slacking!

astorrs says to himself "must put TechExams away and get back to packing... flight leaves in a few hours... ugh...."