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telnet session crashed during preclear

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My client PC crashed while it was connected to the Unraid server by telnet and running preclear on a drive. After the client rebooted, I tried running telnet to preclear again. I noticed that the reading speed is about half of the speed before (36 vs 78 MB/s). Does this mean the original preclear session is still running? If so, how do I kill the original session?

 

By the way, if I didn't specify -a or -A and thus used the wrong alignment, what's the worst that will happen? I'm using Unraid 4.7.

If you followed the guides that tell you to use screen, then the preclear should still be running in the screen session. The worst consequence of alignment is a slowdown in data speeds from a particular specific series of drives that handled alignment poorly.

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I didn't use screen (didn't find a tutorial), I just ran preclear by the command "preclear_disk.sh /dev/sda", so the telnet window went away with the reboot. If the first preclear is still running, I'm not sure how to terminate it.

 

Although, now I see that the reading speed is up to 82 MB/s, which contradicts the observation of getting half the speed as before.

 

How much is the slowdown if alignment was specified incorrectly? How can we check if the alignment is 4K or not?

Not using screen  = preclear quit when telnet closed.

 

What model hard drive?

 

What does the default partition format show on the settings page?

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