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PERC 5/i RAID Card: Tips and Benchmarks - Page 256

post #2551 of 7150
Quote:
Originally Posted by DJZeratul View Post
Agreed with devsk, it works fine. I have 8 1TB blacks in RAID5 on the PERC and 5 seagate 750s on the ICH10R in RAID0
How long have you had your Caviar Black's in RAID 5? Have you had any issues with them? I'm thinking about doing the same, but I'm hesitant because the Black series isn't technically a RAID edition drive.
    
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post #2552 of 7150
Does this look like a good deal?

http://cgi.ebay.com/Dell-Perc-5i-PCI...3%3A1|294%3A30
    
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post #2553 of 7150
Thread Starter 
Quote:
Originally Posted by ShadowFox19 View Post
For $150, I would have expected the battery and cable to be included.
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post #2554 of 7150
Quote:
Originally Posted by ShadowFox19 View Post
here is better deal

http://cgi.ebay.com/ws/eBayISAPI.dll...m=110365572905
post #2555 of 7150
Quote:
Originally Posted by RobiNet View Post
It's the same thing as I posted, but it doesn't include the cables ($52 for cables)...I think it's the same seller too.
    
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post #2556 of 7150
Quote:
Originally Posted by ShadowFox19 View Post
It's the same thing as I posted, but it doesn't include the cables ($52 for cables)...I think it's the same seller too.
you don't need to buy cables from him

$10 per SAS/SATA cable:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=370203301863
or
http://cgi.ebay.com/ws/eBayISAPI.dll...m=280349649293

or $19.98 for full SAS cable:
http://cgi.ebay.com/ws/eBayISAPI.dll...m=170337568978

and I don't think that this is the same seller - yours sell used, mine - new OEM
Edited by RobiNet - 6/5/09 at 11:57am
post #2557 of 7150
You guys are completely forgetting the ability of the controller to recover from a degraded array.

The thing is that the chances of a read error on current hard disks is about one error in 10^14 bits (approximately one bit out of every 10TB). So if you use RAID10 with 1TB hard disks, there's a 1 in 5 chance that you will get some sort of data loss while rebuilding an array (because controllers don't check twice!).

However, if you use RAID5, while rebuilding the same amount of data you have a near-0% chance of data loss because the data is checked with the parity information and single bit errors can be corrected. However, if you have more than 6TB of drives in an array you should definitely go with RAID6.
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post #2558 of 7150
Quote:
Originally Posted by Manyak View Post
You guys are completely forgetting the ability of the controller to recover from a degraded array.

The thing is that the chances of a read error on current hard disks is about one error in 10^14 bits (approximately one bit out of every 10TB). So if you use RAID10 with 1TB hard disks, there's a 1 in 5 chance that you will get some sort of data loss while rebuilding an array (because controllers don't check twice!).

However, if you use RAID5, while rebuilding the same amount of data you have a near-0% chance of data loss because the data is checked with the parity information and single bit errors can be corrected. However, if you have more than 6TB of drives in an array you should definitely go with RAID6.
I assume this is in response to the RAID10/RAID50 debate...

The point you make is actually even more in favour of RAID10 - if 1 disk fails, the controller only needs to re-sync the RAID1 pair that is degraded. So if we assume 1TB disks, a single disk failure in RAID10 results in up to 1TB of data being read during the rebuild - with a ~1 in 10 chance of an unrecoverable read error.

For RAID50, a single failed disk results in a 4-disk degraded RAID5 array. To rebuild this array, up to 3TB of data needs to be read in order to rebuild the failed disk. This gives a ~3 in 10 chance of an unrecoverable read error. Remember there is no parity to help here, as the array is degraded.

If capacity is not of concern, RAID10 is the safest level supported by the PERC5.
post #2559 of 7150
about 3 months now, and no issues so far whatsoever. its pretty stable.
    
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post #2560 of 7150
Quote:
Originally Posted by DJZeratul View Post
about 3 months now, and no issues so far whatsoever. its pretty stable.
That's great!
Did you use the WDTLER utility to enable TLER?
    
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