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Gary E. Miller posted on Sat, 22 Jun 2013 15:15:16 -0700 as excerpted: |
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>> >> [Does md/raid1 do parallel reads of multiple files at once?] |
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>> > |
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>> > It surely does. I have confirmed that at least monthly since md has |
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>> > existed in the kernel. |
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>> |
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>> Out of curiosity, /how/ do you confirm that? I agree based on real |
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>> usage experience, but with a claim that you're confirming it at least |
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>> monthly, it sounds like you have a standardized/scripted test, and I'm |
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>> interested in what/how you do it. |
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> |
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> I have around 30 RAID1 sets in production right now. Some of them doing |
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> mostly reads and some mostly writes. Some are HDD and some SSD. |
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> The RAID sets are pushed pretty hard 24x7 and we watch the performance |
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> pretty closely to plan updates. I have collectd performance graphs |
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> going way back. |
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So you're basically confirming it with normal usage as well, but have |
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documented performance history going pretty well all the way back. Not |
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the simple test script I was hoping for, but pretty impressive, none-the- |
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less. |
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Thanks. |
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-- |
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Duncan - List replies preferred. No HTML msgs. |
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"Every nonfree program has a lord, a master -- |
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and if you use the program, he is your master." Richard Stallman |
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