Hi Craig On 19/1/20 3:47 pm, Craig Sanders via luv-main wrote
That would be a very good idea. Most modern motherboards will have more than enough NVME and SATA slots for that (e.g. most Ryzen x570 motherboards have 2 or 3 NVME slots for extremely fast SSDs, plus 6 or 8 SATA ports for SATA HDDs and SSDs. They also have enough RAM slots for 64GB DDR-4 RAM, and have at least 2 or 3 PCI-e v4 slots - you'll use one for your graphics card).
2 SSDs for the rootfs including your home dir, and 2 HDDs for your /data bulk storage filesystem. And more than enough drive ports for future expansion if you ever need it.
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some info on nvme vs sata:
NVME SSDs are **much** faster then SATA SSDs. SATA 3 is 6 Gbps (600 MBps), so taking protocol overhead into account SATA drives max out at around 550 MBps.
NVME drives run at **up to** PCI-e bus speeds - with 4 lanes, that's a little under 40 Gbps for PCIe v3 (approx 4000 MBps minus protocol overhead), double that for PCIe v4. That's the theoretical maximum speed, anyway. In practice, most NVME SSDs run quite a bit slower than that, about 2 GBps - that's still almost 4 times as fast as a SATA SSD.
Some brands and models (e.g. those from samsung and crucial) run at around 3200 to 3500 MBps, but they cost more (e.g. a 1TB Samsung 970 EVO PLUS (MZ-V7S1T0BW) costs around $300, while the 1TB Kingston A2000 (SA2000M8/1000G) costs around $160 but is only around 1800 MBps).
AFAIK there are no NVME drives that run at full PCI-e v4 speed (~8 GBps with 4 lanes) yet, it's still too new. That's not a problem, PCI-e is designed to be backwards-compatible with earlier versions, so any current NVME drive will work in pcie v4 slots.
NVME SSDs cost about the same as SATA SSDs of the same capacity so there's no reason not to get them if your motherboard has NVME slots (which are pretty much standard these days).
BTW, the socket that NVME drives plug into is called "M.2". M.2 supports both SATA & NVME protocols. SATA M.2 runs at 6 Gbps. NVME runs at PCI-e bus speed. So you have to be careful when you buy to make sure you get an NVME M.2 drive and not a SATA drive in M.2 form-factor...some retailers will try to exploit the confusion over this.
craig
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Hi Craig here is the output of blkid /dev/sdb1: LABEL="Data" UUID="73f55e83-2038-4a0d-9c05-8f7e2e741517" UUID_SUB="77fdea4e-3157-45af-bba4-7db8eb04ff08" TYPE="btrfs" PARTUUID="d5d96658-01" /dev/sdc1: LABEL="Data" UUID="73f55e83-2038-4a0d-9c05-8f7e2e741517" UUID_SUB="8ad739f7-675e-4aeb-ab27-299b34f6ace5" TYPE="btrfs" PARTUUID="a1948e65-01" I tried the first UUID for sdc1 and the machine hung but gave me an opportunity to edit the fstab and reboot. When checking the UUID I discovered that the first entry for both drives were identical. Should I be using the SUB UUID for sdc1 for the entry in fstab? Kind regards Andrew