JorgeB Posted June 28, 2018 Share Posted June 28, 2018 4 minutes ago, guru69 said: Am I right in assuming RAID10 will provide the best write speeds/reliability for the cache pool? It would be the best option for both speed and redundancy, if you can use 4 devices. Quote Link to comment
guru69 Posted June 28, 2018 Share Posted June 28, 2018 OK. I will order one more SSD, Thanks! Quote Link to comment
JorgeB Posted June 28, 2018 Share Posted June 28, 2018 Thought, a 3 NVMe raid1 pool might perform better than a 4 SSD raid10 pool, depending on the devices used. Quote Link to comment
guru69 Posted June 28, 2018 Share Posted June 28, 2018 What do you recommend to test read/write speed on the cache RAID? I just ordered 4th SSD, but am interested now in testing both ways. Quote Link to comment
JorgeB Posted June 29, 2018 Share Posted June 29, 2018 11 hours ago, guru69 said: What do you recommend to test read/write speed on the cache RAID? I usually prefer testing in real world situations, i.e., by copying/reading files to the pool, but if you're more interest in raw speeds you can use dd, google dd speed test. Quote Link to comment
guru69 Posted June 29, 2018 Share Posted June 29, 2018 Yes I've used DD in the past, mostly interested in raw speeds. I wasn't sure if there was another tool or plugin in Unraid that was better. I will post my results to forum, Thanks for your advice 1 Quote Link to comment
guru69 Posted July 2, 2018 Share Posted July 2, 2018 Here are my results from DD... (Before) 2 x Samsung 850 Pro 256GB Sata3 in Raid1 -> 425MB/s to 465MB/s (After) 4 x Samsung 960 Pro NVME in RAID10 -> 1.5GB/s to 1.6GB/s I'm a happy camper ? Quote Link to comment
guru69 Posted July 3, 2018 Share Posted July 3, 2018 Maybe I spoke too soon. After 24 hours w/ 4 SSDs on RAID10, Got a message about a cache drive missing. Logs showed lots of "read errors corrected.." and 2 of my dockers disappeared. I ran the Preclear/Erase all Data on the newly unassigned SSD, all 100% Success. I switched the SSD drives around to different sockets (new build, to rule out the socket). I attempted once more on RAID10 with same result (on new socket, same SSD). I switched the array to RAID1, all errors in log have ceased, so will restore appdata and see how it goes. Interestingly, DD reports the exact same speeds of 1.5GB/s to 1.6GB/s using RAID1, hopefuly its a bit more reliable. Quote Link to comment
JorgeB Posted July 3, 2018 Share Posted July 3, 2018 40 minutes ago, guru69 said: Got a message about a cache drive missing Device dropping won't have anything to do with raid mode, it's a hardware/connection problem. Quote Link to comment
guru69 Posted July 3, 2018 Share Posted July 3, 2018 If it were a connection issue I'd assume once it landed in Unassigned Devices that it would produce errors there as well. It completed Preclear twice and passed Smart tests. It also produced the same odd behavior in a different socket once back in the cache pool. I haven't seen any issues on RAID1 yet (up for an hour now), but I'll keep you posted. If its a connection issue then I'm sure the errors will return (fingers crossed). Quote Link to comment
billy.j.mcnabb Posted July 24, 2019 Share Posted July 24, 2019 guru69 - Are you using the 4 SSD's in RAID1 or 2 of them? Any update on the errors you were getting? Quote Link to comment
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