gundam83 Posted February 24, 2011 Share Posted February 24, 2011 From what I've read, it's recommended that your parity drive be your fastest drive. But what if all your data drives are the same? All of mines are WD Green 2tb drives. Would I actually see a benefit of using something faster (7200rpm drive) as the parity drive? I plan to have a 640gb WD Blue as my cache drive if that effects anything. Also, I have two 1.5tb WD Green EARS drives lying around that I was going to use as data drives. Are there any issues with those? I've tried searching and the only issues I've read are about the 1.5tb samsungs. Quote Link to comment
bubbaQ Posted February 24, 2011 Share Posted February 24, 2011 If all of your data drives are WD Green 2tb drives, then you parity has to be 2GB also. Quote Link to comment
BRiT Posted February 24, 2011 Share Posted February 24, 2011 Possibly, but more times than not you will not see any performance difference. It depends on usage patterns. If you're not doing multiple concurrent writes to different drives then odds are you will see little to no performance increases. If you're only writing data once and reading many times such as media streaming to playback movies or music then the parity drive is not in the picture at all since it's not used for reads (unless you're reading from a simulated failed drive). Quote Link to comment
gundam83 Posted February 24, 2011 Author Share Posted February 24, 2011 If all of your data drives are WD Green 2tb drives, then you parity has to be 2GB also. Yes I'm aware of that. I planned on using a WD Green 2tb as the parity drive unless there was significant increase in performance by using a faster drive. The 640gb WD Blue will be a cache drive. Quote Link to comment
BRiT Posted February 24, 2011 Share Posted February 24, 2011 What constitutes Significant Increase to you? Quote Link to comment
gundam83 Posted February 24, 2011 Author Share Posted February 24, 2011 What constitutes Significant Increase to you? Let's say my transfer rate is 30mb/s. 50mb/s would be significant. 35mb/s not so much. Quote Link to comment
aiden Posted February 24, 2011 Share Posted February 24, 2011 Let's say my transfer rate is 30mb/s. 50mb/s would be significant. 35mb/s not so much. The 35 is more likely than the 50, if there was any increase to be had. Quote Link to comment
gundam83 Posted February 24, 2011 Author Share Posted February 24, 2011 Possibly, but more times than not you will not see any performance difference. It depends on usage patterns. If you're not doing multiple concurrent writes to different drives then odds are you will see little to no performance increases. If you're only writing data once and reading many times such as media streaming to playback movies or music then the parity drive is not in the picture at all since it's not used for reads (unless you're reading from a simulated failed drive). That is exactly what I'll be using for. It's primarily going to be a media server, with the occasional backup image dumped into it. Quote Link to comment
lionelhutz Posted February 24, 2011 Share Posted February 24, 2011 If you write to the cache drive then it makes no difference. If you search you will find this topic is repeatedly discussed a sickening number of times. Peter Quote Link to comment
aiden Posted February 25, 2011 Share Posted February 25, 2011 If you search you will find this topic is repeatedly discussed a sickening number of times. lol Quote Link to comment
dgaschk Posted February 25, 2011 Share Posted February 25, 2011 Worst case performance is based on rotational latency of the slowest disk involved. If you do concurrent writes to multiple disks a faster drive will help. Quote Link to comment
lionelhutz Posted February 25, 2011 Share Posted February 25, 2011 Worst case performance is based on rotational latency of the slowest disk involved. If you do concurrent writes to multiple disks a faster drive will help. Ya, in theory.... It's been proven otherwise, ie changing from all EARS to a Hitachi parity increased the write speed. Once again, do a search and you'll find the information. Still, something like 30Mbps to 35Mbps would be the more likely result. Peter Quote Link to comment
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