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SSD vs HDD for data security

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Haenk:

--- Quote from: golden_labels on September 25, 2023, 11:45:40 am ---could we avoid general statements

--- End quote ---

I'd say: All modern storage devices are quite reliable, but safety comes from not trusting them to be reliable - and make backups.

AndyBeez:
Question:  is using a pair of SSDs in RAID 0 (striped) configuration, pure genuis or full scale stupid? For data security, do SSDs only ever need to be used in RAID 1 (mirrored) mode?

Berni:

--- Quote from: wraper on September 25, 2023, 08:58:33 am ---
--- Quote from: Berni on September 25, 2023, 05:37:24 am ---The more analog levels you cram into ever smaller flash cells the more leaky they will become.

--- End quote ---
They do not become more leaky from cramming more analog levels. The issue is that even a small leak causes the problem reading the cell content correctly due to small difference between voltage levels. While SLC needs to just distinguish between 1 and 0. FWIW QLC NAND used as if it was SLC is just as good as real SLC.

--- End quote ---

Yep that is what i meant. The levels being closer together means the flash cell will take less time to leak enough to flip a bit.


--- Quote from: AndyBeez on September 25, 2023, 02:46:53 pm ---Question:  is using a pair of SSDs in RAID 0 (striped) configuration, pure genuis or full scale stupid? For data security, do SSDs only ever need to be used in RAID 1 (mirrored) mode?

--- End quote ---

It is rarely a good idea to use SSDs in RAID 0. You can buy normal off the shelf consumer SSDs in M.2 that can do >10GB/s sequential speeds. It is hard to find a reason for needing more speed than that in any normal consumer setting. Doing RAID on drives this fast might actually negatively impact performance due to the overhead.

metebalci:
There can be reasons to run raid0, it is not very different than HDDs, it might be a read only cache, you might want to combine the capacity of two drives, increase total iops etc. it depends on the need. Naturally you shouldnt keep something you really care on these drives.

Halcyon:

--- Quote from: golden_labels on September 25, 2023, 11:45:40 am ---By this logic I can claim HDDs are very robust. Because my primary drive soon reaches 100 kh of 24/7 operation. Must be more than all Halcyon’s SSDs together. And its brother, which was turned off for some time,(1) is over 74 kh. Does it prove anything of use to OP? No, nothing.

Sharing personal experience is valuable. But c’mon: this is not putting a lot of single observations on a heap and hoping together they provide good information. It’s defending claims, not even disguised as something else. :(

--- End quote ---

We're talking about two very two different types of failure here. You're talking about potential failure due to wear, not data loss due to being in storage.

I think the lack of reliable, long-term testing basically leaves us with our own experiences many of us have gathered over the years. Until we can get some solid data, unfortunately anecdotal evidence is all we have at this point. Unless someone can point to some reliable studies that show that SSDs are less reliable than we think, I'm going to rely on my own observations.

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