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post #4191 of 7257
Quote:
Originally Posted by DJZeratul View Post
I have 8 WD Black with TLER at whatever its at factory (off). I haven't had a disk drop out. Ive done a lot with the array. I think it really depends on the hardware. If they get stuck on a bad block, they'll drop out... But I haven't had that happen yet. Its been 1 year since I made this array and I use it daily, heavily.

If you are really worried about it, go with Seagate... They have dropped the ball in the past with the bricked drives and some such, so I know a lot of people dont trust them anymore... but I've heard good things about their firmware after the 7200.12 bricking debacle. They are also a bit faster at sequential reads and seek time than the WDs, from my testing.

Both Seagate and WD have 5 year warranty so, maybe do a RAID6 so you can have 2 drives fail and then make sure to do Advance RMA so you dont have to run degraded for too long.
Hello, i finally opt to 7200.12 series , keeping in mind your advice

So, i'm just (finally) beginning the RAID experience with 2 * 1TB RAID1 (going later to RAID5 or RAID6).

I admit : i'm confused with all the readings i've made about stripe size / ntfs cluster size

Well, is there any simple "thumb rule" for it ?

What i've setup :

RAID1 : ARA / WB Cache / 64k stripe

Disk : i had to opt to GPT i suppose (for later expandings)

NTFS cluster size : 32k/64k ? (main files : big files, divx, iso, etc...)

Thank you very much

P.S. : Sorry to ask it because i know it's a difficult subject but i'm really confused after reading so much posts about adequate stripe/cluster sizes...
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post #4192 of 7257
Quote:
Originally Posted by XZed View Post
Hello, i finally opt to 7200.12 series , keeping in mind your advice

So, i'm just (finally) beginning the RAID experience with 2 * 1TB RAID1 (going later to RAID5 or RAID6).

I admit : i'm confused with all the readings i've made about stripe size / ntfs cluster size

Well, is there any simple "thumb rule" for it ?

What i've setup :

RAID1 : ARA / WB Cache / 64k stripe

Disk : i had to opt to GPT i suppose (for later expandings)

NTFS cluster size : 32k/64k ? (main files : big files, divx, iso, etc...)

Thank you very much

P.S. : Sorry to ask it because i know it's a difficult subject but i'm really confused after reading so much posts about adequate stripe/cluster sizes...
For my storage drive, I am using 512k stripe.

Cluster size is default, I believe. I haven't done much messing around with the cluster size, but the large stripe size makes quite a difference for sequential reads of large files. If you want to read even faster, go with 1024K, but I found that degraded write performance to below 300K/sec, so I pulled it back to 512K. It leaves write speed up around 450K/sec and reads over 600K/sec on my array.
    
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post #4193 of 7257
Hey guys.

I recently (about 2 months ago) got a Perc 5i card.
Occasionally a hard drive would go offline, and sometimes it would go foriegn and I just imported it. However right now, 2 hard drives have gone foriegn, and I am unable to import them. They are 8x1.5tb WD green hard drives. I ran the WD diagnostics on both of the drives, and the first one passed all tests in about 2-3 hours. The next one was going to take 11 days, so I aborted it thinking there was something obviously wrong with it.
I had a friend come over and we used linux and ddrescue (i think thats what it was) to do a block by block copy to a spare hard drive hoping to make an exact copy of the hard drive so I could get it back into the array. There were no errors detected on the apparently errornous hard drive. So I tried each of the 3 hard drives, one at a time, or two. However each time, I was still unable to import. I got the error code "Failed to import: 0xc".

I know raid is not a proper backup solution, and that I should have done it somewhere else. I dont need to hear it again.

If anyone has ANY information that could help me that would be fantastic.

Thanks in advance
post #4194 of 7257
Quote:
Originally Posted by mikemil View Post
Hey guys.

I recently (about 2 months ago) got a Perc 5i card.
Occasionally a hard drive would go offline, and sometimes it would go foriegn and I just imported it. However right now, 2 hard drives have gone foriegn, and I am unable to import them. They are 8x1.5tb WD green hard drives. I ran the WD diagnostics on both of the drives, and the first one passed all tests in about 2-3 hours. The next one was going to take 11 days, so I aborted it thinking there was something obviously wrong with it.
I had a friend come over and we used linux and ddrescue (i think thats what it was) to do a block by block copy to a spare hard drive hoping to make an exact copy of the hard drive so I could get it back into the array. There were no errors detected on the apparently errornous hard drive. So I tried each of the 3 hard drives, one at a time, or two. However each time, I was still unable to import. I got the error code "Failed to import: 0xc".

I know raid is not a proper backup solution, and that I should have done it somewhere else. I dont need to hear it again.

If anyone has ANY information that could help me that would be fantastic.

Thanks in advance
I'm having trouble following your numbers... you say you have 8x1.5TB WD Greens, then you said 2 dropped out as foreign, then you said you tried 3 drives... I'm confused. What RAID level are you running your drives in?
    
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post #4195 of 7257
Sorry about that.

I have a total of 8 x 1.5tb hard drives.
I have 7 of them running in a RAID 5 array.
2 of them have dropped out as foreign. I used the 8th drive as a spare to try and copy the data from one of the dropped drives to it, hoping I could get that one to work.
I have now tried the new one, and the other two in various orders in the array and try and get it working.
Does this help? Please let me know if I need to provide any more information. Thankyou for the reply by the way.
post #4196 of 7257
OK well, it sounds to me as if the array configuration got corrupted.

This is a dangerous fix if you don't know the exact order your disks were in before, or if you don't know that all of your disks are functioning OK (seems like one might be bad considering the WD Utility didnt finish on it)

Basically the way to fix a corrupted array config is to re-create the array, using the same disks in the same order, using the EXACT same settings you set up the previous array with, and then choosing not to initialize the array at the end. This will re-create the array configuration and a healthy array will show up after this. However a non-healthy array might completely failboat, causing you massive anguish.

I wish you luck in any event.
    
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post #4197 of 7257
Thanks again for the reply.

I have actually seen that solution posted a few time around the internet. I do see however that their are major risks involved. Is there ANYTHING else you think I could try before doing this?

Thanks again.

Oh and, you said it would be bad if one of the hard drives had errors on it.
This is something I am a bit confused about. I did run WD diagnostics on it, and it was going to take over 11 days to finish, however when I did the block by block copy, it detected no errors. So I am a bit confused about weather it actually has errors on it or not.
Edited by mikemil - 3/20/10 at 6:50am
post #4198 of 7257
Quote:
Originally Posted by DJZeratul View Post
For my storage drive, I am using 512k stripe.

Cluster size is default, I believe. I haven't done much messing around with the cluster size, but the large stripe size makes quite a difference for sequential reads of large files. If you want to read even faster, go with 1024K, but I found that degraded write performance to below 300K/sec, so I pulled it back to 512K. It leaves write speed up around 450K/sec and reads over 600K/sec on my array.
Thank you very much for your answer !

I found this statement from Dell, that confirm your tests :

The PERC 6 offers RAID levels with the choice of stripe sizes 8K, 16K, 32K, 64K, 128K, 256K,
512K, and 1MB with the default being 64K. We chose 512K and tested RAID levels 0, 1, 5, 6
and 10. Higher stripe sizes create less physical I/O operations and improve PCI-Express bus
utilization. 512K was selected as it is commonly used in Linux® and was determined to have
the best combination of benefit for large I/O and least detriment for small I/O on this controller
across multiple Operating Systems.


(Source : http://www.dell.com/downloads/global...WP_WMD1120.pdf )

So :

512k stripe size
Default cluster size
Write Back

Juste a last one : i didn't find another Dell's document about "Read Ahead" tests.

By the way, i remember have read some times ago, in this topic, the various tests concluding that the best choice is "Adaptive Read Ahead" :

Your opinion, please ?

Thank you again,

Sincerely,
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post #4199 of 7257
By the way,

has anyone tried to upgrade PERC 6/i fw from v6.1 to v6.2 ?

If tried/succeeded, which way has been used ?

Sincerely,
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post #4200 of 7257
Quote:
Originally Posted by XZed View Post
Thank you very much for your answer !

I found this statement from Dell, that confirm your tests :

The PERC 6 offers RAID levels with the choice of stripe sizes 8K, 16K, 32K, 64K, 128K, 256K,
512K, and 1MB with the default being 64K. We chose 512K and tested RAID levels 0, 1, 5, 6
and 10. Higher stripe sizes create less physical I/O operations and improve PCI-Express bus
utilization. 512K was selected as it is commonly used in Linux® and was determined to have
the best combination of benefit for large I/O and least detriment for small I/O on this controller
across multiple Operating Systems.


(Source : http://www.dell.com/downloads/global...WP_WMD1120.pdf )

So :

512k stripe size
Default cluster size
Write Back

Juste a last one : i didn't find another Dell's document about "Read Ahead" tests.

By the way, i remember have read some times ago, in this topic, the various tests concluding that the best choice is "Adaptive Read Ahead" :

Your opinion, please ?

Thank you again,

Sincerely,
I have heard speculation on Adaptave and Always Read Ahead... Always can be faster in most sequential read situations (Storage Drive), whereas Adaptive can be better for more of a staggered read situation (OS Drive)

Always Read Ahead will boost your benchmark scores but Adaptive can help with multiple file reads However, Always will always read ahead to the next stripe and cache it, so if you have data the drive needs to seek elsewhere on the drive, its gotta flush that cache and seek it elsewhere. It makes for very very fast sequential reads and is detrimental to random reads.

Quote:
Originally Posted by XZed View Post
By the way,

has anyone tried to upgrade PERC 6/i fw from v6.1 to v6.2 ?

If tried/succeeded, which way has been used ?

Sincerely,
6.2 gave me gains of around 50 MB/sec read. It is very worth it. I was only able to get it to flash using the Windows Binary and the command line tool manually via DOS. UNIX has a similar one I believe, haven't tried it though.
    
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