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RAID 1 (2 drives) vs RAID 5 (3 drives)


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#1 ericgcollyer

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Posted 27 March 2012 - 01:39 PM

See Topic Title. Which has better read/write performance?

#2 Waco

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Posted 27 March 2012 - 01:40 PM

RAID 1 by far, especially with small writes.

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#3 El_Capitan

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Posted 27 March 2012 - 01:46 PM

Depends on what you're wanting them for. I'd always go for RAID 10 or RAID 1 over RAID 5, but that's just me.

#4 bigball1

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Posted 27 March 2012 - 03:09 PM

raid 1 for good read speeds ok write speeds
raid 0 for good read write speeds
raid 5 good read speeds but has poor write speeds

Edited by Bigball1, 28 March 2012 - 11:06 AM.


#5 hornybluecow

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Posted 27 March 2012 - 04:30 PM

i suggest raid 1 unless you are doing work that requires more speed.

raid-1- 1 drive can fail, hence redundant
raid-0 - either drive goes bad and you lose all the data, none recoverable
raid-5 - speed of raid-0 BUT if more than 1 drive goes bad at a time you lose everything

if you limited to only 3 drives i would go with raid-5 for the speed and simi redundancy,

if you can get more (like 4 or more) go with raid-6 (basically raid-0 with redundancy)


otherwise, like i said at the start, if you don't need speed and want to save money, just get 2 drives and go with raid-1.

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#6 ericgcollyer

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Posted 28 March 2012 - 07:26 AM

Thanks for all the replies. I've noticed that I have become somewhat of a leech in the forum, asking a whole lot more questions than I am answering. I will change as of today, you guys are the best.

I'm not sure if RAID 5 actually has improved write speeds. I currently have a RAID 5 array, but seem to get slow write speeds compared to a single drive I have in my system. I was just trying to get some opinions from other system builders. Thanks for all the help you have given me over the past couple of months.

#7 Waco

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Posted 28 March 2012 - 07:57 AM

RAID 1 is preferable in every way over RAID 5 when you have few drives. Unless you're doing 4+ drives in RAID 5 it's pointless. I would also suggest avoiding RAID 5 entirely if your drives are 1 TB or more because of the chances of a rebuild failure.

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#8 MercuryDoun

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Posted 28 March 2012 - 08:58 AM

both raid 5 and raid 1 have write overhead that slows writes, but they both have quite good read speeds. At least with modern raid controllers.

And dont do raid 6... its not like raid 0 with redundancy... its raid 5 except with two parody drives instead of only one... Its even slower than raid 5 is!

Really the easiest way to decide is, even number of drives(2 or 4) go with RAID1 or 1+0(AKA 10), odd number of drives(3 or 5) go with raid-5.

This isn't knew information, im mostly just repeating what everyone else has already said, but another opinion never hurts!

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#9 Waco

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Posted 28 March 2012 - 09:10 AM

Well RAID 1 writes as fast as a single drive. RAID 5 can write about the same for large files but it's slooooow for small writes.

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