李春 <pickup112@xxxxxxxxx> 于2019年1月30日周三 上午7:08写道： > > # 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. Sounds like, you want failfast feature in upstream, not sure if RH backport it into their kernel. Regards, Jack
