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PERC 5/i RAID Card: Tips and Benchmarks - Page 254

post #2531 of 7257
Quote:
Originally Posted by BLinux View Post
"safest" RAID level on the PERC 5/I card would probably be RAID10, and you would need an even number of drives.
the same level of safety like RAID 5 with bad luck - two same drives dead and you lose everything but RAID 5 give more space and speed

RAID 50 will be safer than RAID 10 - because even if two the same drives will be dead - it will still work in the worst case - RAID 5 can survive crash of 3+ drives - two the same and all from one sub-raid ...
post #2532 of 7257
Quote:
Originally Posted by RobiNet View Post
the same level of safety like RAID 5 with bad luck - two same drives dead and you lose everything but RAID 5 give more space and speed

RAID 50 will be safer than RAID 10 - because even if two the same drives will be dead - it will still work in the worst case - RAID 5 can survive crash of 3+ drives - two the same and all from one sub-raid ...
Comparing RAID levels on PERC5 for safety:

8 disk RAID50

Any 1 drive, plus any 1 drive from the second RAID0 span. More than 2 failures = full data loss. 2 drives from 1 RAID5 set = full data loss.

Chance of 1st drive failure resulting in data loss = 0
Chance of 2nd drive failure resulting in data loss = 3 out of 7
Chance of 3rd drive failure resulting in data loss = 100%


8 disk RAID10

Any 1 drive, plus up to 3 other failures from other RAID1 pairs.

Chance of 1st drive failure resulting in data loss = 0
Chance of 2nd drive failure resulting in data loss = 1 out of 7
Chance of 3rd drive failure resulting in data loss = 2 out of 6
Chance of 4th drive failure resulting in data loss = 3 out of 5
Chance of 5th drive failure resulting in data loss = 100%


RAID10 is much safer, but only gives 50% available capacity. RAID50 gives 75% available.
Edited by the_beast - 6/2/09 at 6:09am
post #2533 of 7257
Well, I finally got all the pieces to my new server (took half a year), and everything was going smooth with the build.... too smooth.

I have a Perc 5/i, Asus P5N32-SLI SE Deluxe, and an Intel Q9400.

It turns out, the P5N32-SLI SE Deluxe does not support the newest Intel CPUs. Therefor, I'll be keeping the CPU and selling the board.


That leads me to my next question. What is a good motherboard that will support that CPU? How about 750i or 780i? I'd like to stay cheaper, if possible... but even more so I would like this to be as painless as possible.

Thanks!
post #2534 of 7257
Quote:
Originally Posted by the_beast View Post
[...]
nice calculations but lets try the same scenario to both levels

you have 8 drives - two sets of RAID 0 or RAID 5:

1A 1B
2A 2B
3A 3B
4A 4B

bad luck - 1A is dead and 1B is dead - RAID 50 still works fine - RAID 01 (whole set of stripes is mirrored) - all your data are history

then you can loose one or even all drives from one RAID 5 - second RAID 5 still works fine RAID 0 is still dead

if you have luck - RAID 50 gives you more space, almost same speed AND is much safer

even if you try to use RAID 10 (each stripe is mirrored) - you still are out of bussines if you loose 1A and 1B ...
Edited by RobiNet - 6/2/09 at 4:41pm
post #2535 of 7257
Quote:
Originally Posted by RobiNet View Post
nice calculations but lets try the same scenario to both levels

you have 8 drives - two sets of RAID 0 or RAID 5:

1A 1B
2A 2B
3A 3B
4A 4B

bad luck - 1A is dead and 1B is dead - RAID 50 still works fine - RAID 01 (whole set of stripes is mirrored) - all your data are history

then you can loose one or even all drives from one RAID 5 - second RAID 5 still works fine RAID 0 is still dead

if you have luck - RAID 50 gives you more space, almost same speed AND is much safer

even if you try to use RAID 10 (each stripe is mirrored) - you still are out of bussines if you loose 1A and 1B ...
NO!!!

You are comparing RAID51, not RAID50. The RAID5 sets are striped, not mirrored - if you lose 1 RAID5 set (2 disks from 1 set gone), you lose all your data.

If you are unlucky, 2 drives lost will lose all data on both schemes.

If you are lucky, RAID10 can lose half the disks and still not lose data. RAID50 can only lose 2 disks - a third disk failure will destroy the array with all data lost.
post #2536 of 7257
Quote:
Originally Posted by the_beast View Post
NO!!!

You are comparing RAID51, not RAID50. The RAID5 sets are striped, not mirrored - if you lose 1 RAID5 set (2 disks from 1 set gone), you lose all your data.
yeah sorry
post #2537 of 7257
anyone have any idea how ot remove the mounting clip from teh original heatsink?
txp
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post #2538 of 7257
Thread Starter 
Quote:
Originally Posted by iceboi714 View Post
anyone have any idea how ot remove the mounting clip from teh original heatsink?

Hold the heatsink firmly in the middle.. then push down on clip above the loop and slide the whole heatsink/loop sideways to free it from the loop.
Once again...
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post #2539 of 7257
i got it out of the loop....just trying to remove the clip from the heatsink itself so i can use it on anothe heatsink /w fan
txp
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post #2540 of 7257
Do you guys think it would be okay/safe to create a RAID10 comprised of WD Caviar Black drives?
    
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