Ubuntu Focal
ga kernel
This problem was originally reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=1783075
Using the linux-generic-hwe-20.04-edge packages resolves the issue.
We hit this while exploring storage options for PS5 where we would like to put a Optane as cache device in front of a NVMe SSD backing device with 512 byte optimum I/O size.
While the problem appears to be fixed for the kernel we file this bug to document a need for Focal hwe-edge images for commissioning/deploy in MAAS.
Excerpt from MAAS deploy log:
register_bcache: /dev/nvme1n1 > /sys/fs/bcache/register bcache dev /dev/nvme1n1 not ready, waiting 0.2s check just created bcache /dev/nvme1n1 if it is registered, try=60 Running command ['udevadm', 'settle'] with allowed return codes [0] (capture=False) TIMED udevadm_settle(): 0.015 bcache device path not found: /sys/class/block/nvme1n1/bcache bcache device was not registered, registering /dev/nvme1n1 at /sys/fs/bcache/register register_bcache: /dev/nvme1n1 > /sys/fs/bcache/register bcache dev /dev/nvme1n1 not ready, waiting 0.2s Repetitive error registering the bcache dev /dev/nvme1n1 An error occured handling 'bcache0': RuntimeError - bcache device /dev/nvme1n1 can't be registered finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: configuring bcache: bcache0 TIMED BLOCK_META: 28.332 finish: cmd-install/stage-partitioning/builtin/cmd-block-meta: FAIL: curtin command block-meta Traceback (most recent call last): File "/curtin/curtin/commands/main.py", line 202, in main ret = args.func(args) File "/curtin/curtin/log.py", line 97, in wrapper return log_time("TIMED %s: " % msg, func, *args, **kwargs) File "/curtin/curtin/log.py", line 79, in log_time return func(*args, **kwargs) File "/curtin/curtin/commands/block_meta.py", line 111, in block_meta return meta_custom(args) File "/curtin/curtin/commands/block_meta.py", line 1911, in meta_custom handler(command, storage_config_dict) File "/curtin/curtin/commands/block_meta.py", line 1652, in bcache_handler bcache_dev = bcache.create_backing_device(backing_device, cache_device, File "/curtin/curtin/block/bcache.py", line 479, in create_backing_device ensure_bcache_is_registered(backing_device, target_sysfs_path) File "/curtin/curtin/block/bcache.py", line 436, in ensure_bcache_is_registered raise RuntimeError("bcache device %s can't be registered" % RuntimeError: bcache device /dev/nvme1n1 can't be registered bcache device /dev/nvme1n1 can't be registered
Marking as fix released for MAAS as artifacts to deploy Focal with hwe-20.04-edge kernel are now available.