LVM Cache stuck at Flushing blocks for cache

Jun 16, 2019

I've setup a new hypervisor setup with LVM Cache using SSD's on a Raid 6 Volume. Whenever I have to move a disk or migrate it, I always change the LVM cachemode from writethrough to writeback to prevent unnecessary write wear to the SSDs. Once the disk move is done, I change it back to writeback. The issue here is always stuck at "Flushing 3122 blocks for cache raid/vol1" for hours. The only way to clear this is a simple reboot. The problem here I cannot always reboot when all the customer's VM's are still running on this specific hypervisor. What can I do to clear this issue without rebooting the hypervisor?


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