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On Thursday, 2 January 2020 18:48:03 GMT Dale wrote: |
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> Ian Zimmerman wrote: |
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> > On 2020-01-01 18:09, Dale wrote: |
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> >> As some may recall, I have a 8TB external SATA hard drive that I do |
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> >> back ups on. Usually, I back up once a day, more often if |
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> >> needed. Usually I turn the power on, mount it, do the back ups, |
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> >> unmount and turn the power back off. Usually it is powered up for 5 |
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> >> minutes or so. When I unmount it tho, I sometimes notice it is still |
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> >> doing something. I can feel the mechanism for the heads moving. It has |
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> >> a slight vibration to it. Questions are, what is it doing and should |
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> >> I let it finish before powering it off? I'd assume that once it in |
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> >> unmounted, the copy process is done so the files are safe. I guess it |
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> >> is doing some sort of internal checks or something but I'm not sure. |
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> > |
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> > I have observed the same thing. But in my case, I also disconnect the |
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> > _cable_ from the computer to the enclosure when I am done ... and still |
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> > the drive activity goes on. From that I conclude that it is the drive |
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> > circuitry itself doing some kind of internal housekeeping, and there is |
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> > no point in worrying about it because one would wait forever for it to |
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> > end. |
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> |
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> That's one thing that makes it unnervey. I'll put my hand around to the |
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> back and feel those little bumps. I wait until I think it is done but |
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> just as I'm about to power it off, it bumps again. It's so |
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> unpredictable, I never know if it is done doing its thing or not. Just |
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> like now, it's unmounted, did that during last reply, it hasn't did the |
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> bump thingy while reading your reply or me typing mine in so far. Now |
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> as soon as I reach around to turn it off, it'll likely do the bump thing |
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> again. lol |
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I suspect it is now reading your mind! Is this a case of AI?! |
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LOL! |
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> One thing is for sure tho, if you unplug the cable, whatever it is |
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> doing, it's internal. Sort of hard for the puter to be doing something |
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> when it isn't connected. That narrows the options down a lot. That's a |
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> good piece of info there. |
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> |
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> Thanks. |
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> |
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> Dale |
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> |
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> :-) :-) |
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In case you missed it in a previous post - have you compiled CONFIG_DM_ZONED |
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in your kernel to see if its performance changes? |
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https://zonedstorage.io/linux/config/ |
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It's behaviour may not change whatsoever, if the drive only has an internal |
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(SMR firmware) data write mechanism. However, if the drive is exposing an I/O |
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API to the OS, then you could well see a difference to how its data storage |
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bumps, spins and shakes as it flushes its journal and goes about its garbage |
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collection process when the Linux kernel 'talks' to it. |
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-- |
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Regards, |
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|
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Mick |
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