# Description of problem: We loaded a disk from two network of storage node via iscsi, merged into a disk through multipath, and made a raid1 with local disk by mdadm. However, when the storage machine of iscsi disk rebooted, raid1 disk does not automatically eject the abnormal disk when there are some IO pressure.
# Version-Release number of selected component (if applicable): vermagic: 2.6.32-573.el6.x86_64 SMP mod_unload modversions srcversion: 39AAB97325332236F2FFCA9 # How reproducible: always # Steps to Reproduce: 1. export a disk from storage node 2. load the disk on another node and merge it with multipath 3. assemble a local disk and the multipath by madm to a raid1 disk 4. reboot # Actual results: * multipath disk not eject from raid1 disk under Fio pressure * multipath disk eject immediately from raid1 disk when stop Fio pressure # Expected results: * multipath disk eject immediately from raid1 disk under Fio pressure # Additional info: We have done the following tests: * In rhel6.7 with kernel of 2.6.32-573.el6.x86_64 test, mdadm's raid1 will eliminate the abnormal disk after 5 seconds without IO pressure * In rhel6.7 with kernel of 2.6.32-573.el6.x86_64 test, in the case of IO pressure, mdadm's raid1 will not reject the abnormal disk, until the IO pressure stops, the disk will be removed. * In rhel7.4 with kernel of 3.10.0-693.el7.x86_64 test, mdadm's raid1 will eliminate the abnormal disk after 5 seconds without IO pressure * In rhel7.4 with kernel of 3.10.0-693.el7.x86_64 test, mdadm's raid1 will eliminate abnormal disk after 5 seconds under IO pressure Thanks for your help.
