RAIDing a 7200.11 and a Raptor?

LoneWolf121188 · Jan 16, 2008

So I just read a review of the 7200.11 vs the Raptor and came away intrigued...the Barracuda destroyed the Raptor in some tests, while the Raptor took the crown in others. So what if you RAIDed the two? Could you effectively get the advantages of both drives at the same time?

Automata · Jan 16, 2008

Nope. It would have the seek times of the slower drive and the transfer rate of the slowest drive....just like memory

MR-FIX-IT · Jan 16, 2008

You can't.

The latencies are different. Plus you can't raid different sized disks, unless you do JBOD.

You could probably do RAID via the OS, but I think it would fail soon, as the latencies are way off.

nd4spdbh2 · Jan 16, 2008

NUCKINGFUTS said:
You can't.

The latencies are different. Plus you can't raid different sized disks, unless you do JBOD.

You could probably do RAID via the OS, but I think it would fail soon, as the latencies are way off.

WRONG

you can raid 2 completely different disk's no problem. Your problem is you will be limited by the smallest and slowest disk... IE if you raided a 7200.11 500gb seagate and a 74gb (8mb chache raptor)

You would be limited by the raptors space (74 gb) thus loosing 426gb of the seagate, you would also be limited by the older raptors average STR (~65MB/s on the raptor VS the 87MB/s on the .11). And then you would be limited by the random access time of the 7200.11 (~13ms vs the raptors 8)

In other words you can. but your only as fast or as strong as your weakest link.

Automata · Jan 16, 2008

nd4spdbh2 said:
WRONG

you can raid 2 completely different disk's no problem. Your problem is you will be limited by the smallest and slowest disk... IE if you raided a 7200.11 500gb seagate and a 74gb (8mb chache raptor)

You would be limited by the raptors space (74 gb) thus loosing 426gb of the seagate, you would also be limited by the older raptors average STR (~65MB/s on the raptor VS the 87MB/s on the .11). And then you would be limited by the random access time of the 7200.11 (~13ms vs the raptors 8)

In other words you can. but your only as fast or as strong as your weakest link.

Yup yup

Basically, you lose a lot of space and speed....

I ran a 100 and 160 in a raid0 and got horrible performance. If it was loading from the drive during a game, I'd be less than 1 frame a second, it was horrible.

MR-FIX-IT · Jan 16, 2008

nd4spdbh2 said:
WRONG

you can raid 2 completely different disk's no problem. Your problem is you will be limited by the smallest and slowest disk... IE if you raided a 7200.11 500gb seagate and a 74gb (8mb chache raptor)

You would be limited by the raptors space (74 gb) thus loosing 426gb of the seagate, you would also be limited by the older raptors average STR (~65MB/s on the raptor VS the 87MB/s on the .11). And then you would be limited by the random access time of the 7200.11 (~13ms vs the raptors 8)

In other words you can. but your only as fast or as strong as your weakest link.

What RAID controller can do this?

Automata · Jan 16, 2008

NUCKINGFUTS said:
What RAID controller can do this?

My AW9D-MAX with a ICH7R southbridge did it no problem.

CGR · Jan 16, 2008

NUCKINGFUTS said:
What RAID controller can do this?

I dont know of any that cant.

nd4spdbh2 · Jan 16, 2008

CGR said:
I dont know of any that cant.

ya same here... if you can hook the drive to the controler then you can raid the drive. i mean if i bought a PATA raid controler i could plug in a 1998 10gb Maxtor and a 7200.10 750gb seagate and raid them.

MR-FIX-IT · Jan 16, 2008

thideras said:
My AW9D-MAX with a ICH7R southbridge did it no problem.

Hmmm... Ok. AS my rule, I would never connect slower technology to faster technology, ever. Soon or later you'll have a problem...

But that is good to know (no useful for me) to tell people that matrix RAID can do the impossible.

Now are we talking RAID 0? or Mirroring? or both?

Jon · Jan 16, 2008

NUCKINGFUTS said:
Hmmm... Ok. AS my rule, I would never connect slower technology to faster technology, ever. Soon or later you'll have a problem...

But that is good to know (no useful for me) to tell people that matrix RAID can do the impossible.

Now are we talking RAID 0? or Mirroring? or both?

Any. This has been possible since RAID controllers have been available. My old ATA66 Highpoint controllers could even do this.

The controller doesn't care about the size of the disks. It will make a virtual volume (using the RAID type specified) out of the space from all volumes respective to the smallest drive available.

80GB + 160GB RAID 0 = 160GB total space
80GB + 160GB mirrored = 80GB total mirrored space
80GB + 160GB + 200GB RAID5 = 160GB total usable space + 80GB parity

...on and on.

MR-FIX-IT · Jan 16, 2008

Jon said:
Any. This has been possible since RAID controllers have been available. My old ATA66 Highpoint controllers could even do this.

The controller doesn't care about the size of the disks. It will make a virtual volume (using the RAID type specified) out of the space from all volumes respective to the smallest drive available.

80GB + 160GB RAID 0 = 160GB total space
80GB + 160GB mirrored = 80GB total mirrored space
80GB + 160GB + 200GB RAID5 = 160GB total usable space + 80GB parity

...on and on.

Well that makes sense. Both are same type drives (7200 RPM). The OP said a raptor (10K RPM) and a baracuda (7200 RPM), and raid those two. I don't think it would be wise to do this... That what I said no too..

The latencies are way to different and will cause data corruption and the RAID will break.

EDIT:

I Have a system here with 2 WD 80 gig drives, and 2 150 gig raptors... I'll do a test on the ICH7R controller...

RAIDing a 7200.11 and a Raptor?

LoneWolf121188

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Automata

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MR-FIX-IT

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nd4spdbh2

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Automata

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Automata

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CGR

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nd4spdbh2

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MR-FIX-IT

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Jon

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MR-FIX-IT

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