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The option can be used in multiple ways (like --cachesettings):
--integritysettings key=val
--integritysettings 'key1=val1 key2=val2'
--integritysettings key1=val1 --integritysettings key2=val2
Use with lvcreate or lvconvert when integrity is first enabled
to configure:
journal_sectors
journal_watermark
commit_time
bitmap_flush_interval
allow_discards
Use with lvchange to configure (only while inactive):
journal_watermark
commit_time
bitmap_flush_interval
allow_discards
lvchange --integritysettings "" clears any previously configured
settings, so dm-integrity will use its own defaults.
lvs -a -o integritysettings displays configured settings.
Document usage of chaining external origins as it is now possibly to
create thinA LV in poolA which use thinB LV in poolB as it external
origin and user could create chain of such LV.
Since understanding the reason for choosing the appmachineid over the
direct use of machineid is not easily found, I extended to help text to
clarify this a bit.
If the system changes, locate PVs that appear on different devices,
and update the device IDs in the devices file. A system change is
detected by saving the DMI product_uuid or hostname in the devices
file, and comparing it to the current system value. If a root PV
is restored or copied to a new system with different devices, then
the product_uuid or hostname should change, and trigger lvm to
locate PVIDs from system.devices on new devices.
When exit on file is present in a system and term/break signal is
catched, them dmeventd is no longger refusing to exit.
For the correct shutdown, there should be ideally unmonitoring call,
however in some case it's very hard to implement this correct procedure.
With this 'exit on' file dmeventd at least avoid 'blocking' shutdown,
before systemd kills use with -9 anyway possibly even in some unwanted
stated of internal dmeventd processing (i.e. in the middle of some lvm
command processing).
To quickly get info about some internal dmeventd status,
implment 'dmeventd -i' support.
Reported messages are some 'raw' internal informations mainly
useful to developers.
