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Frank Steinmetzger wrote: |
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> Am Tue, Apr 12, 2022 at 05:03:01PM -0500 schrieb Dale: |
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>> Rich Freeman wrote: |
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>>> On Tue, Apr 12, 2022 at 1:08 PM Dale <rdalek1967@×××××.com> wrote: |
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>>>> I remounted the drives and did a backup. For anyone running up on this, |
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>>>> just in case one of the files got corrupted, I used a little trick to |
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>>>> see if I can figure out which one may be bad if any. I took my rsync |
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>>>> commands from my little script and ran them one at a time with --dry-run |
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>>>> added. If a file was to be updated on the backup that I hadn't changed |
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>>>> or added, I was going to check into it before updating my backups. |
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>>> Unless you're using the --checksum option on rsync this isn't likely |
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>>> to be effective. |
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>> My hope was if it was corrupted and something changed then I'd see it in |
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>> the list. If nothing changed then rsync wouldn't change anything on the |
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>> backups either. I'll look into that option tho. May be something for |
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>> the future. ;-) I suspect it would slow things down quite a bit tho. |
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> The advantage of an integrity scheme (like ZFS or comparing with a checksum |
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> file) over your rsync approach is that you only need to read all the datas™ |
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> from one drive instead of two. Plus: if rsync actually detects a change, it |
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> doesn’t know which of the two drives introduced the error. You need to find |
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> out yourself after the fact (which probably won’t be hard, but still, it’s |
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> one more manual step). |
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> |
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In this case, if something had changed, I'd have no problem manually |
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checking the file to be sure which was good and which was bad. Given |
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the error is recent on my drive, I'd suspect the backups to still be a |
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good file. For that reason, I'd suspect the backup file to be good |
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therefore not to be overwritten. I was trying to avoid a bad file |
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replacing a good file on the backup which then destroys all good files |
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and leaves only bad ones. This is why I like that SMART at least let me |
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know there is a problem. |
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Sometimes things has to be done manually which is often the best way. |
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Just depends on the situation I guess. |
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|
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Dale |
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:-) :-) |