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Found 1 result

  1. Mainly for information as not a Drivepool problem but it initially looks like it is when first experienced. I was getting slow copy performance to the pool via my 10G network - basically it would run fine at close to 500mb/s (sata ssd to sata ssd) about as fast as it can go with the disks involved. This would continue for a minute or so then the copy would slow down to 20-30mb/s or in some cases virtually zero - it was during a copy of a +200gb backup file so not a small file problem which i initially thought it might be. With further testing i found it would happen on virtually any file with a reasonable size so the file size is not the contributing factor although it does show the problem more fully the larger the file being copied is. One thought was that something was overheating and being throttled - checked Scanner no disk was above 35c. Sending pc also had low temps as well. Also checked the 10G network cards and they were showing no errors and normal temps according to the driver info. The server with DP installed was very sluggish to respond when the slow copy occurred but memory load was at most 50% on a 32GB system - hmmmm odd When monitoring a copy more closely on the server i could see the "modified" memory in Task manager climb as a large copy started and would peak out at about 12GB at which point the copy would slow down to an effective crawl. Over time (few minutes) this would decrease back to a lower value and then the copy would speed up again but would drop to a crawl when the "modified" memory peaked again. So i checked the write cache settings on all drives and found all but one had write cache enabled - odd why would one not have it checked - well it turns out that write cache is disabled on the system drive of a domain controller by default. So after enabling it the copy speed went back to normal. However this does not survive a reboot as windows 20212 r2 Essentials must check this value and turn it off. - Grrr So to prevent slow copies on your network (occurs on 1g and 10g Lan) dont include your OS drive or any partition (my mistake) of the drive in your pool especially if its an ssd with SSD Optimizer as when files get written to that drive the performance slows to a crawl and will speed up again when copying to other ssd's - so you get very variable copy performance and a very sluggish pc until the memory is cleared out. I am experimenting with an option to modify the memory cache size in 2012 r2 to see if it makes any difference to the performance. As i can see that on a 10g network the performance does still decrease (with write cache enabled) when the memory cache is filled to approx 50% of normal copy speed - this might be related to DP doing real time duplication but not sure yet. Will report back when i understand more Hope this helps somebody with similar issues
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