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Wols Lists wrote: |
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> On 07/01/19 10:46, Dale wrote: |
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>> From what I've read, that can be overcome. If you get say a SMART |
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>> message that a drive is failing, |
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> Yup, I have to agree that SMART isn't always reliable, but if you |
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> *monitor* it, it should give plenty of warning of the recording medium |
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> failing ... |
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> |
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Yep. It may not detect a spindle motor that is about to fail. I'm sure |
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it can't detect that lightening is about to strike and the drive get hit |
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with a surge either. It can generally tell if the media is failing |
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tho. I've read it can detect some components that are starting to fail |
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to, not all but some. Still, even tho it can't detect everything, it is |
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better than no warning at all. Until something better comes along, ESP |
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maybe, it will have to do. ;-) |
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>> just remove that drive or remove the |
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>> whole LVM setup and use something else until a working drive setup can |
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>> be made. Once ready, then move the data, if the drive still works, to |
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>> the new drive. That is basically what I did when I swapped a smaller |
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>> drive for a larger one. I moved the data from one drive to another. It |
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>> did it fairly quickly. Someone posted that it may even be faster to do |
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>> it with LVM's pvmove than it is with cp or rsync. I don't know how true |
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>> that is but from what I've read, it moves the data really efficiently. |
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> Point is, it works at a different level. Both cp and rsync are NOT |
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> guaranteed to copy your filesystem accurately - mine is full of hard |
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> links and that will give both those two a hard and nasty time. |
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> |
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> LVM copies the block device underneath the file system, so it is less |
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> efficient in that it will copy 3GB if you have a 3GB partition, but it |
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> is far simpler in that it neither knows nor cares what the file system |
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> is doing at the next level up. Give a file-system like mine to "cp -a" |
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> and it'll bring the system to its knees trying to keep track of where |
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> everything is. |
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> |
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> Cheers, |
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> Wol |
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> |
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That was what I read but couldn't recall enough to tell how it does it. |
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That explains why it can be done while in use to. |
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Just how do you do backups? If cp -a and rsync would not work |
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correctly, what do you use? I'm just curious now. ;-) |
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Dale |
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:-) :-) |
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