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modern storage is crazy
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eugene:
OK. Now we all know some of the different ways that storing redundant copies of data on separate platters, or even separate drives in the same enclosure might not save one's data.

Still looking for creative ways to use a single drive that has 10 or 20 times the capacity I need in my laptop.
KaneTW:

--- Quote from: elekorsi on April 27, 2022, 08:26:15 pm ---I was allways fascinated by the prices of Siemens Simatic memory cards. For example, list price for the 256MB (yes, megabytes) is 364€... 32GB model will cost you an arm and a leg with the price tag of 1038€. And those are active products and not some obsolete old parts...
I suspect that in the hardware they are all the same, they just make them look smaller... Oh, forgot to say, 4MB model is cheap it's only 53€  :-DD

--- End quote ---

You're paying for the usage license. They're just standard SD cards with some licensing stuff added.
PlainName:

--- Quote ---Can you elaborate why RAID1 on separate drives should not be used for data protection?
--- End quote ---

I will echo what mariush said in his earlier posts.

The advantage of RAID is that there should be no downtime for (relatively) trivial problems. If you have RAID1 and a disk fails, you can generally keep going (although the rebuild can be slow). With single drive you're stuffed until you've acquired the replacement and performed a restore, which can be from hours to days depending on how prepared you were.

Also, RAID can improve perfomance.

But RAID should never take the place of backups. There are many problems, from a disk faulting during a rebuild through an external actual disaster to a simple wrong finger issue. You need to do proper backups as well, and if you're going to do those then many of the RAID solutions aren't actually necessary. Do you really need real time protection from, say, two drives failing simultaneously or can you cope with an hour offline?

Personally I used to run RAID1 to save on downtime should a drive fail, but the slowness during rebuilds (which would occur if the OS didn't shut down cleanly) were too much aggro for the perceived gains, so I don't even do that nowadays. A realtime copy of changed important files (typically source code) pushed off-box as they change deals with inter-backup data loss (and adds version history to boot, which RAID1 didn't).

A client had a server running RAID5. I was called in when it wouldn't boot one day and found that the data was gone. Apparently, a drive had failed but no-one noticed (because, RAID) and then another drive failed. They realised the problem and bought two replacement drives,  but couldn't get them to rebuild... Of course, they didn't need backups because, RAID.

PlainName:

--- Quote ---Still looking for creative ways to use a single drive that has 10 or 20 times the capacity I need in my laptop.
--- End quote ---

Crypto.

Torrent node.

Porn collection.

Cloud backups for someone else.
jpanhalt:
@mariush
Basically, you seem to be saying that if a nuke hits your house or wherever you PC is, how do you protect your data?  I'm not particularly worried about that, as the chance I would be a safe distance away is absolutely near zero.  If I am toast, I don't care about my data.
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