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[Anandtech]Western Digital Adds Helium-Filled WD Gold 10 TB HDD to Lineup - Page 7

post #61 of 64
I used to use a program that would back up everything to an external hdd overnight and was very easy to use

wish i could remember the name of it but i think i got it with a seagate hdd in 2008
post #62 of 64
I use FreeFileSync to back up my data and the paid version of Macrium Reflect to back up my System drive, although Macrium Reflect Free works quite well.

Since FreeFileSync only backs up files that have been added, changed, or deleted, it works quite quickly compared to doing a complete refresh of a backup every time. Since I only use Macrium Reflect to back up System files, it also runs pretty quickly. My backup drives run in built in hot swap bays in my case running directly off MOBO SATA ports so that also speeds up my backups.
     
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post #63 of 64
Quote:
Originally Posted by xxdarkreap3rxx View Post

It almost isn't though: https://www.mangolassi.it/topic/121/raid-link-blast These consumer drives today are 4-6 TB easily. Just three of those and your array has a larger chance of failing to rebuild than it does succeeding to rebuild. If you're using mechanical consumer drives, RAID 5 is just plain junk since there's a high chance you'll end up restoring from a backup anyway (due to a failed rebuild).

I find that hard to believe... but yeah reading up on it seems to be true... but I have had drives goes out in some of my systems at work and I was able to rebuild them successfully. So, whats the best way to ensure stability? Raid 10,51,61?
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post #64 of 64
Quote:
Originally Posted by Mrzev View Post

I find that hard to believe... but yeah reading up on it seems to be true... but I have had drives goes out in some of my systems at work and I was able to rebuild them successfully. So, whats the best way to ensure stability? Raid 10,51,61?

https://encrypted.google.com/search?hl=en&q=raid%205%20site%3Aspiceworks.com

I did a lot of research on it and it makes perfect sense. Consumer drives have roughly a 1 in 10^14 bits read URE rate: http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-771434.pdf That's

100000000000000 bits
12500000000000 bytes
12207031250 kB
11920929 mB
11641.5 gB
11.4 tB

Say you have 3 TB drives, three of them in a RAID 5 array. That's about 6 TB that would have to be read for a rebuild. When you have drives that encounter a URE roughly every 12 TB, that's about a 50% chance of failure:


http://www.raid-failure.com/raid5-failure.aspx

Enterprise NL-SAS/SATA drives (3.5" 7200 RPM) usually have roughly a 1 in 10^15 bits read URE rate: http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-771386.pdf which is a magnitude higher than the consumer drives. In the case above with these drives, "The probability of successfully completing the rebuild is 93.1%". Much better but still a bit risky that the rebuild fails and you end up having to restore from a backup.

Enterprise SAS drives (2.5" 10K & 15K RPM) usually have roughly a 1 in 10^16 bits read URE rate: http://www.seagate.com/www-content/product-content/enterprise-performance-savvio-fam/enterprise-performance-15k-hdd/ent-perf-15k-5/en-us/docs/enterprise-performance-15k-hdd-ds1797-5c-1504us.pdf http://www.seagate.com/www-content/datasheets/pdfs/enterprise-performance-10k-hddDS1785-8C-1607US-en_US.pdf which is a magnitude higher than the above. Even if you had 24 of the 1.2 TB 10K RPM drives in a RAID 5 array, "The probability of successfully completing the rebuild is 97.5%" (note: these drives are physically smaller and have much less capacity than the 3.5" drives; I think the highest they make is 1.8 TB).

For consumer drives, RAID 10 is highly recommended but costly as there's a big loss in array capacity. It also has the huge benefit of avoiding parity calculations so it doesn't hit every drive like RAID 5 and RAID 6 do. As far as UREs on RAID 10:

"No, RAID 10 is not parity and is not subject to URE failures like RAID 5 or 6. There are countless threads on this. It is because of this that RAID 10 is in a completely different reliability category than parity RAID.

All RAID types, except for RAID 0, are able to survive URE without incidence while healthy. It is only while degraded that they are at risk of a URE. For parity RAID, it is when they drop to no remaining parity that encountering a URE during resilver causing the array to fail completely.

RAID 10 does not resilver and does not have this risk. When RAID 10 loses a drive, it remirrors, not resilvers. During a remirror a URE goes unnoticed.

RAID 10 is subject to a URE during this process, but it has no reason to halt a remirror. It would just mean that that one block is corrupt. Generally this has no impact. It is the same as your desktop encountering a URE which is does from time to time. Chances are, no one notices. If it is noticed, the impact is limited to a single file, not the entire array."

Source: https://community.spiceworks.com/topic/977451-can-raid-10-encounter-a-ure
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