mbc0 Posted April 4, 2019 Author Share Posted April 4, 2019 (edited) Many Thanks @johnnie.black I will try 2 MX500's (I already have 1) so will order another. although my mainboard has 3 nvme slots so that may be another way to go, I have 1 or 2 Samsung evo's lying around and 1 on my main rig. If 4 fast SSD's won't give more than 500 how to you get 700? is it because of the quantity? what raid version are you using? Thanks Edited April 4, 2019 by mbc0 Quote Link to comment
mbc0 Posted April 4, 2019 Author Share Posted April 4, 2019 I am looking at 2 Intel 660p Series M.2 Drives My theory is that I could use 2 of these in RAID 1 Mirror, I should get around 700/900mb/s using this config? General Device TypeSolid state drive - internal Capacity1 TB Hardware EncryptionYes Encryption Algorithm256-bit AES NAND Flash Memory Type3D quad-level cell (QLC) Form FactorM.2 2280 InterfacePCI Express 3.0 x4 (NVMe) FeaturesSmart Response Technology, End-to-end data protection, Rapid Start Technology Width22 mm Depth80 mm Weight10 g Performance SSD Endurance200 TB Internal Data Rate1800 MBps (read) / 1800 MBps (write) 4KB Random Read150000 IOPS 4KB Random Write220000 IOPS Quote Link to comment
JorgeB Posted April 4, 2019 Share Posted April 4, 2019 Intel 660p are QLC, IIRC sustained write speed after the pseudo SLC cache is full goes down to 100MB/s. Quote Link to comment
mbc0 Posted April 4, 2019 Author Share Posted April 4, 2019 Ok, so I need to find a NVME drive that does not use QLC like the Kingston which uses a 3D NAND Technology, NVM Express (NVMe), Phison E8 controller Can you confirm that if I use two in mirror mode I can expect roughly half of the performance? Looking at 2 X 1TB capable of 1800mb/s would it be unreasonable to expect 700-800mb/s in Raid 1 Mirror mode? Thanks Quote Link to comment
JorgeB Posted April 4, 2019 Share Posted April 4, 2019 27 minutes ago, mbc0 said: the Kingston which uses a 3D NAND Technology, NVM Express (NVMe), Phison E8 controller I'm guessing you mean the A1000, no personal experience with these, but quick search shows they might not be that fast: Also look at the 660p performance when full (with no or little SLC cache left): IMO if you want performance you should go with the Samsung EVO, they are a little more expensive, but you seldom can get cheap and fast, I have two 1TB 970 EVOs on my desktop and am very happy with then, now would be the 970 EVO Plus. Quote Link to comment
mbc0 Posted April 4, 2019 Author Share Posted April 4, 2019 Ok, that is great information, many thanks! I have a 960 Evo in my Desktop as the OS disk and like you cannot complain Can you confirm that if I use two in mirror mode I can expect roughly half of the performance? Looking at 2 X 1TB capable of 1800mb/s would it be unreasonable to expect 700-800mb/s in Raid 1 Mirror mode? Quote Link to comment
JorgeB Posted April 4, 2019 Share Posted April 4, 2019 11 minutes ago, mbc0 said: Can you confirm that if I use two in mirror mode I can expect roughly half of the performance? In mirror you should get about the same performance as a single device, though in my experience you'll never get quoted (or even benchmarked) performance in real world use. 12 minutes ago, mbc0 said: Looking at 2 X 1TB capable of 1800mb/s would it be unreasonable to expect 700-800mb/s in Raid 1 Mirror mode? 700/800MB/s is about what I would expect with a fast device, like the 970 EVO, with single device or mirror. Quote Link to comment
mbc0 Posted April 4, 2019 Author Share Posted April 4, 2019 That's great, as always thanks for the advice, I will let you know how I get on 🙂 Quote Link to comment
mbc0 Posted April 14, 2019 Author Share Posted April 14, 2019 Hi @johnnie.black Just following up my issue. I have replaced the 4 X 500GB SSD Cache Pool with 1TB Samsung NVME 970 Evo Plus and can now transfer at 950MB/s to 1000MB/S when copying from NVME on my Desktop to unRAID without any glitches or slowdowns so VERY happy with this 🙂 Quote Link to comment
aim60 Posted July 23, 2019 Share Posted July 23, 2019 On 4/2/2019 at 7:56 AM, johnnie.black said: On 4/2/2019 at 7:47 AM, mbc0 said: Is there a "Safer" way to run a SSD pool? Make sure all shares are set to COW. Any problem converting the system share containing the docker and libvirt images to COW? Quote Link to comment
JorgeB Posted July 23, 2019 Share Posted July 23, 2019 21 minutes ago, aim60 said: Any problem converting the system share containing the docker and libvirt images to COW? No, but only new files written to that share, or re-written, will have checksums. Quote Link to comment
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