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