>the outdated L2ARC data will NOT be served but is it cleared with `zpool trim`?
On 10/20/20, Georgios Amanakis <gamana...@gmail.com> wrote: > Yes, this is expected behaviour. L2ARC does not invalidate previously > written data on cache devices even if they are removed from the pool. > > You do not need to worry though, the outdated L2ARC data will NOT be > served, as their checksum, DVA properties, and birth transaction will > differ from the data present in the disks of the pool. > > On Tue, Oct 20, 2020, 6:03 PM <adam.blaszczykow...@gmail.com> wrote: > >> Hello, >> I have noticed unusual behaviour with Persistent L2ARC . I will try to >> describe how to reproduce this problem. >> All tests are performed on zfs-2.0.0-rc1_71_g51de0fc. I am using Virtual >> Machine on ESXi 6.7 server. >> >> Test scenario: >> 1. ZFS pool created with L2ARC that has about 8,4 GB of data on L2arc >> disk >> 2. Disconnecting VM disk with L2ARC from Virtual Machine >> 3. Deleting some data from the zpool with disconnected L2ARC disk >> - zpool iostat command shows that some of cached data also has been >> removed from disconnected L2ARC disk >> 4. Reconnecting VM disk with L2ARC disk to Virtual Machine and rebooting >> system >> 5. Adding new data to the zpool - new data are cached in L2ARC disk >> 6. Deleting all data from zpool >> 7. L2arc disk still has some data, even if there is no data on zpool >> 8. Rebooting system >> 9. After reboot the same situation, zpool is empty but L2ARC disk still >> has some data >> >> I am expecting that deleting all data from zpool also removes data from >> L2ARC cache. >> Is it normal behaviour of Persistent L2ARC? >> >> Thank you >> *openzfs <https://openzfs.topicbox.com/latest>* / openzfs-developer / see >> discussions <https://openzfs.topicbox.com/groups/developer> + >> participants >> <https://openzfs.topicbox.com/groups/developer/members> + delivery >> options >> <https://openzfs.topicbox.com/groups/developer/subscription> Permalink >> <https://openzfs.topicbox.com/groups/developer/T77c79c75ab05a912-Me6344594a06ca2007e812e93> >> > > ------------------------------------------ > openzfs: openzfs-developer > Permalink: > https://openzfs.topicbox.com/groups/developer/T77c79c75ab05a912-Mb34a9323a370dcef95a2d53f > Delivery options: > https://openzfs.topicbox.com/groups/developer/subscription > ------------------------------------------ openzfs: openzfs-developer Permalink: https://openzfs.topicbox.com/groups/developer/T77c79c75ab05a912-M1d0b4012241c8f0bff6a5188 Delivery options: https://openzfs.topicbox.com/groups/developer/subscription
