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Re: virtual device both is and isn't a valid file system [complete]


On Tue, May 14, 2019 at 10:20:47AM -0700, Ross Boylan wrote:
> Noticing the "write on read-only" error, and remembering it should be
> read-only, I added that to the mount options.  Which still failed, but
> differently:
> root@barley:~/tempserver-check# date; strace -f mount -r
> /dev/stretch-vg/boot stretch_boot
> Tue 14 May 2019 10:07:05 AM PDT
> mount("/dev/mapper/stretch--vg-boot",
> "/root/tempserver-check/stretch_boot", "ext4", MS_RDONLY, NULL) = 0

I don't see a failure here.

> +++ exited with 0 +++
> root@barley:~/tempserver-check# dmesg | tail
> [76983.987331] EXT4-fs (dm-30): mounted filesystem with ordered data
> mode. Opts: (null)

Nor I do not see it here. It should be mounted.

> The bad sector was at 7,724,531,336, 8 sectors long, using 512b
> sectors and decimal numbers.
> The partition sdf2 starts at sector 4096 and ends at 7814035455.  Even
> with all the layers, that doesn't seem to be the one reporting the
> error.  And on sdf2 reading that location should not be a hardware
> error, just junk data.

"Can't read superblock on ..." is a red herring here.
See my other e-mail.