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Hi. I am again, with a similar question to previous. |
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I want to install RAID on SSD's. |
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|
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Comparing THEORETICALLY, RAID0 (stripe) vs RAID1 (mirrior). The performance |
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would be something like this: |
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|
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n= number of disks |
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|
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reads: |
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raid1: n*2 |
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raid0: n*2 |
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|
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writes: |
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raid1: n |
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raid0: n*2 |
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|
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But, in real life, the reads from raid 0 doesn't work at all, because if |
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you use "chunk size" from 4k, and you need to read just 2kb (most binary |
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files, txt files, etc..). the read speed should be just of n. |
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|
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On the other side, I read over the net, that kernel don't support |
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multithread reads on raid1. So, the read speed will be just n. Always. ¿It |
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is true? |
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|
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Anyway, my question is. ¿Who have the best read speed for the day to day? |
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I'm not asking about reads off large files. I'm just asking in the "normal" |
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use. Opening firefox, X, regular files, etc.. |
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I can't find the guide definitive. It allways are talking about |
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theoretically performance, or about "real life" but without benchmarks |
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or reliable data. |
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|
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Having a RAID0 with SSD, and following [2] on "SSD Stripe Optimization" |
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should I have the same speed as an RAID1? |
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My question is because i'm between. 4 disks raid1, or RAID10 (I want |
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redundancy anyway..). And as "raid 10" = 1+ 0. I need to know raid0 |
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performance to take a choice... I don't need write speed, just read. |
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¿Anyone knows the true about this? ¿Somebody tried this? |
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Thanx a lot.!! Bytes! ;) |
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|
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[1]http://www.pcstats.com/articleview.cfm?articleid=890&page=5 |
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[2] |
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http://www.overclock.net/t/484367/guide-all-you-ever-wanted-to-know-about-raid |
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