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Raid 6 vs Raid 10 (Only 4 Drives)

post #1 of 9
Thread Starter 
Raid 6 is:
Smallest drive capacity * (number of drives - 2)

Raid 10 is:
Smallest drive capacity * (number of drives / 2)

If i have space for 4 drives in the NAS (4 x 1TB), any of the above setup will essentially give me the same available space and same amount of space used for fault tolerance (2TB Free | 2TB Protection).

Is there a benefit of using one over the other? Maybe one has better speed while other more protection?

Thanks!
post #2 of 9
RAID 10 will give you faster read and write speeds, however it is very possible to lose everything if 2 wrong drives go out at the same time. However on a large scale array you could lose half the drives and still retain your data.

RAID 6 your writes will be somewhat slower due to having an extra checksum however if you lose 2 drives there is a good that you'll still retain the data as it is designed to handle two drive failures whilst RAID 10 can only handle a single drive failure.

Many people believe that RAID is an alternative to regular backups it is not. I recommend that even if you do use RAID you should also backup any critical information you might have.

I hope that helped you.
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post #3 of 9
Yes, very much so, RAID 6 has a tremendous write penalty compared to RAID 10. If the main thing you do is somewhat write intense and/or high concurrent writes, then go RAID 10. Both have read speeds about the same with RAID10 usually slightly faster. Have you considered an appropriate cluster size?
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post #4 of 9
Thread Starter 
Thanks for your feedback. I will always have a back of the data elsewhere but would still prefer more data security over speed. Sounds like Raid 6 might be a better choice.


I have not considered a cluster size. I just purchased a Synology NAS and will get 4 1TB red drives from western digital. If it gives me the chance to setup cluster seize, what kind of options would I have in regards to speed and data integrity?
post #5 of 9
Actually, I would say that RAID10 would be the best choice. The penalties from RAID6 are going to be significant for just 4 drives, and I personally wouldn't want to have 4 drives with the write speed of one.RAID10 however wiwill give you around 2x the write speed of a single drive, and read speeds of about 2.5-3x a single drive. The chances of losing Both of the drives needed to cause a loss of data is low, so long as you don't dilly dally and IMMEDIATELY replace dead drives!
   
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post #6 of 9
While the chance is indeed low it still could happen, I myself lost a RAID10 array once as two drives failed simultaneously. But since everything is backed up daily I have nothing to worry about.

Cluster/Stripe size:

In my experience of working in a datacenter there isn't an optimum stripe size. Here are couple tips.

- Smaller stripe sizes increase I/O bandwidth which are read/write speeds when working with relatively large files such as videos, photoshop files, or anything that depends on speed.

-Larger stripe sizes increase random I/O performance such as when you're working with indexing, working with many files at same time and/or serving a large amount of users.

In my experience RAID 5/6 benefits from smaller stripe size due to faster parity calculations, with RAID 10 there is not much reason to worry over stripe size I'd recommend you set it at 64Kib.
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Brutus
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post #7 of 9
First off, to get the full benefit of RAID 6 you need 5 drives or more, so that option is off the table right out of the box. And with the write penalty of RAID 5, I recommend RAID 10.

As for cluster size, a home user needs to find the point between speed and space utilization that represents the best bang for the buck. Large cluster sizes tend to waste space within the cluster if most of the files you use a small. Small cluster sizes, which provide the best space utilization, will slow fetching of larger files. So the trick is to find a size somewhere in the middle. To find this mid-point, you might take a tip from Microsoft's NTFS format which uses 8K blocks. If YOUR files tend to be on the larger side, double that to 16K.
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The Money Trap
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post #8 of 9
first of all - does it have a decent hardware RAID controller, fakeraid or software RAID?
hardware RAID - all levels supported by the card should be ok (although using an expensive card for RAID0 or RAID1 is an overkill)
fakeraid and software RAID - levels 0, 1 and 10 are ok while 5, 6, 50 and 60 would be slow
taking number of disks and capacity efficiency under consideration:
4x1tb, RAID5 - 3tb array, one disk may fail
4x1tb, RAID10 - 2tb array, 1 disk may fail (if 2 disks fail there is 50% chance of data loss), fast read&write
4x1tb, RAID6 - 2tb array, 2 disks may fail, much slower than RAID10

shortly:
4x1tb, fakeraid or software RAID - only RAID10
4x1tb, hardware RAID - RAID5 (RAID6 may also be considered, but it is better for 5+ disks), RAID10 if you value speed more than capacity efficiency

besides, gigabit ethernet will be a chokepiont anyway (but RAID5 or RAID6 on fakeraid/software RAID may be even slower).
Edited by litd - 3/4/13 at 12:57am
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post #9 of 9
Thread Starter 
Thanks for all your great comments. I considered all the facts and think ill go with the Raid 10 for the extra speed.

As for security, I agreed to trade the same amount of FTP space with other NAS owner so that we can backup each other files(Encrypted). I think its the most secure way to do this since there is almost no change of both NAS blowing up at the same time.

BTW, any ideas/feedback on best way to make that work? I was thinking of just creating a password protected FTP folder so he would only have access.. but if there is a better,more secure/efficient way, i would love to hear your thoughts.

thanks!
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