the only exception to a naive device list comparison had been to ignore
drive UUID information which was unreliable when a device wasn't
formatted / partitioned. however various users have reported different
type of false positives that resulted in orchestration being run
continuously due to the wrong observation that devices were changing.
this patch fixes the cases we have observed and attempts to be slightly
more conservative in the calculation.
1. the devlinks is ignored. when a device is setup for lvm, for example,
the devlinks will be updated with different paths that point to the
device in addition to its standard paths addressable by pci address.
2. in the lvm case, the "model" field and "filesystem" field may also
change.
3. we ignore devices with devlinks that contain "usb" to avoid issues
when using usb drives.
4. be smart about detecting device availability. if a device transitions
from a non-empty (or has-partitions) state to an empty (or unpartitioned)
state then orchestration is triggered. this like observing that a device
is now available (e.g. in the allDevices case). however, when a device
transistions from empty to non-empty, then this is ignored as while it
is a change, it's generally a change associated with the new consumption
of the device.
fixes: #3059fixes: #3185fixes: #3131
Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
this is an attempt to reduce the number of false positive config map
updates used to trigger orchestration for hotplugging.
Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
this patch monitors udev events from the block subsystem via the udevadm
tool. it watches for add and delete events within a specified period
(e.g. 2 seconds) and then emits a trigger which starts a new device
probe operation.
Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
this patch ignores the UUID when determining if a device probe result
has changed. it has been observed that on some machines the UUID for the
devices are not stable. the UUID is still reported as normal through the
configmap.
Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
run "rook discover" on storage nodes and discover devices on each node. The discovered disks are saved in a per node configmap, local-device-nodename.
Device information consits of name and persistent names, uuid, partition, filesystem, rotational, readonly, size, etc.
Signed-off-by: Huamin Chen <hchen@redhat.com>
Noah Watkins
Alexander Trost
travisn
Huamin Chen