On Sun, Mar 22, 2020 at 10:57:35AM -0700, Scott Mcdermott wrote: > have a 931.5 GibiByte SSD pair in raid1 (mdraid) as cache LV for a > data LV on 1.8 TebiByte raid1 (mdraid) pair of larger spinning disk. > these disks are hosted by a small 4GB big.little ARM system > running4.4.192-rk3399 (armbian 5.98 bionic). parameters were set > with: lvconvert --type cache --cachemode writeback --cachepolicy smq > --cachesettings migration_threshold=10000000 If you crash then the cache assumes all blocks are dirty and performs a full writeback. You have set the migration_threshold extremely high so I think this writeback process is just submitting far too much io at once. Bring it down to around 2048 and try again. - Joe _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
