Disklayout have collecting problem

[Kolesar]

Relax-and-Recover (ReaR) Issue Template

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(quick response is not guaranteed with free support):

• rear version (/usr/sbin/rear -V): Relax-and-Recover 2.2 / 2017-07-20
• OS version (cat /etc/rear/os.conf or lsb_release -a): CentOS Linux release 7.3.1611 (Core)
• rear configuration files (cat /etc/rear/site.conf or cat /etc/rear/local.conf): empty
• Are you using legacy BIOS or UEFI boot? UEFI
• Brief description of the issue:
  On each run rear -v mkrescue or rear -v savelayout /var/lib/rear/layout/disklayout.conf have different number of partitions. I have found where is problem in code, but I cannot understand why it happened.
  Command declare -a sysfs_paths=(/sys/block/$sysfs_name/$sysfs_name*) every time return different output, so this is really strange
• Work-around, if any:
  Unfortunately at this moment I do not have work-around. If you have any idea I can try on my hardware and hopefully fix this issue.

[jsmeix]

@Kolesar
I am not at all an expert in this area but in general I assume
when running a particular command on commandline
results varying/unstable/unreliable output
the root cause is likely not inside ReaR but in that command
or even more likely somewhere in the environment
(in this case kernel/udev/whatever...).

Does it perhaps help to add an artificial 'sleep' e.g. like

sleep 30

in the script before that command is run in the hope
that then what there is in /sys/block/... got stabilized
so that the command output is also stable and reliable?

[jsmeix]

@Kolesar
you wrote "any idea I can try on my hardware"
but nobody can have such an idea because
nobody can know what your hardware is
because you did not tell that.

Is this issue here perhaps somehow related to you
#1460
which is about "Raid Level: container"
where you told "I have RAID 1 on my environment"
but not what your environment actually is.

[gdha]

@Kolesar Can you share an example of the differences please? What kind of disk devices do you have?

[gdha]

@Kolesar As no evidence was delivered there is nothing we can do I'm afraid - will close it - you may re-open it when sufficient useful information is provided