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Raid 5 or not

     
9:52 pm on Jun 19, 2017 (gmt 0)

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Hi,

I am sorry, I wasn't sure where to post exactly.

I operate a dedicated server with a Xeon E3-1245 (v2) CPU and 3 x 120 GB SSD.

I am about to reinstall my server completely, and switch to Debian 9. I am also taking the opportunity to refine the way I am managing data, and sort/optimize several things.

So far I was NOT in RAID, because initially my data were bigger. Actually, all my data + OS are taking "only" 169 GB.

So I am wondering if setting the 3 SSD in RAID 5 (Software), would be a good idea or not. This would be roughly 240 GB of space, which I think is leaving enough margin to see things coming, considering my data are not increasing quickly.

I was wondering if the "reading" of data from a RAID 5 Soft will be at least as good as without RAID? (90% of operations on my server are reading, and most are ending in memory cache) In other words, can I expect at least the same performance in reading , as in my actual set up, with no RAID. I think this is what I understood, but I am seeking confirmation (or not).

Thanks,
7:29 am on June 20, 2017 (gmt 0)

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WebmasterWorld Senior Member graeme_p is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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RAID 5 gives you better read performance and has a lower chance of failure than no RAID. If most reads are from cache it is not going to help read performance noticeably, and write performance may be a bit slower.
8:42 am on June 20, 2017 (gmt 0)

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WebmasterWorld Senior Member tangor is a WebmasterWorld Top Contributor of All Time 10+ Year Member Top Contributors Of The Month

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Raid on SSD drives would make me cautious, particularly if in-drive replacement for any failing drive is required. Meanwhile once at SSD levels raid has little extra benefit, other than spanning drives to a larger "logical" state.

I'd throw some burning rust at the storage problem and let the SSD do the "reads" and "cache".

SSD has gotten better, but I've been burned three times and don't trust it for critical infrastructure data storage.
1:58 pm on June 20, 2017 (gmt 0)

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Thank you graeme_p and tangor for your replies.