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Hardware Thread, Raid 5 vs Raid 10 in Technical; From what little I've seen, people are saying 10 > 5? Is this true?...
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    Raid 5 vs Raid 10

    From what little I've seen, people are saying 10 > 5?

    Is this true?

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    featured_spectre's Avatar
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    depends on what you want...

    If you want speed RAID 5

    If you want redundancy RAID 10 (not 01 as that can cause issues)

    RAID 6 is also making its way in, but I haven't tested so cannot comment

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    Raid 10 is faster than Raid 5, however Raid 5 gives greater capacity for the same number of disks. For most general workloads utilising a modern controller with a decent cache size and good RAID algorithm implementation RAID 5 is (now) pretty similar to RAID 10, until you start hitting large numbers of random writes. For that reason I'd normally go for RAID 5 (or 6 which is just 5 with an extra parity drive) unless you needed the performance, or could afford to run RAID 10.

    For our latest SAN we run a mixture of RAID 1, RAID 10 and RAID 6 depending on the storage tier. For tier 0 (SSDs) we run in RAID 1 since they're already pretty fast and we need the redundancy, for tier 1 (15k SAS drives) we run in RAID 10 to get the best performance, and for tier 2 (7.2k SATA disks) we have one pool of RAID 10 for apps that need a bit more performance, but aren't quite important enough to make the higher tiers or for high speed file stores and one pool of RAID 6 for general purpose file stores.

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    Butuz's Avatar
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    Using Raid-TP on my Sun 7110's (Disk Striping with Triple Distributed Parity). This provides the ultimate combination of reliability, quick rebuilds and performance. You do however sacrifice 75% of your capacity at this raid level. That is not an issue currently for us. It may be an issue in the medium term though in which case I will have to move back to Raid 6 to reclaim some more free space. Will cross that bridge when we come to it!

    Butuz

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    synaesthesia's Avatar
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    I will shoot people on sight using Raid10, it's just daft and a waste of resource. Raid 5 with a hotspare is certainly a much better bet out of those two.

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    featured_spectre's Avatar
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    synaesthesia...why do you say that? RAID5 drive failure can mean alot of files lost, but with RAID10 the files can be saved...however each to their own!

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    Quote Originally Posted by nephilim View Post
    synaesthesia...why do you say that? RAID5 drive failure can mean alot of files lost, but with RAID10 the files can be saved...however each to their own!
    He had a fight with a RAID10 box recently.

    *hides*

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    Great info here guys, appreciate the help. I was leaning towards 5 anyway, used it in the past and it seems this has confirmed my confidence. Thanks.

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    Quote Originally Posted by synaesthesia View Post
    I will shoot people on sight using Raid10, it's just daft and a waste of resource. Raid 5 with a hotspare is certainly a much better bet out of those two.
    Disagree with that! Raid 10 has it's place. The only Raid anyone can definitively be shot for using is Raid 0 and infact I think shooting would be too easy for a Raid 0 user – hung drawn and quatered would be more appropriate!!!

    Bear in mind Raid 5 has great read performance but poor write performance so be careful on how you use it. Good for a file server that has lots of data read from it, bad for a database server that has lots of heavy writes.

    Butuz

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    tonyd's Avatar
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    Hmm, not sure in what way RAID 0 (AKA Suicide RAID) can be called RAID anyway - definitely no redundancy there.

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    Quote Originally Posted by Butuz View Post
    Disagree with that! Raid 10 has it's place. The only Raid anyone can definitively be shot for using is Raid 0 and infact I think shooting would be too easy for a Raid 0 user – hung drawn and quatered would be more appropriate!!!

    Bear in mind Raid 5 has great read performance but poor write performance so be careful on how you use it. Good for a file server that has lots of data read from it, bad for a database server that has lots of heavy writes.

    Butuz
    raid 0 does have uses. My home nas box is striped to give me 4tb of backup space but its is just backup so if that goes i replace the drive(s) and copy the data back

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    Butuz's Avatar
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    Yeh I guess it's useful if you want an unreliable backup nas box!

    Butuz

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    Quote Originally Posted by Butuz View Post
    Yeh I guess it's useful if you want an unreliable backup nas box!

    Butuz
    but it is a backup whats the likelyhood of that my pc and my laptop all losing the data at the same time?

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    Butuz's Avatar
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    Let's hope you never find out!!!

    Butuz

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    synaesthesia's Avatar
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    That Raid10 fight is still ongoing (although now it's nothing to do with the RAID, it's just further incompetence from my now ex employer). Also it's rather better on a decent raid controller than it is on an entry level HP server with onboard fakeraid which does *not* allow on the fly builds >:|

    So, apologies for the previous shout which was slightly tainted by my altercation

    (nurses a black eye and split lip)



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