Hi These patches extend dm-delay, so that the user can select separate delay for flush requests. Zdenek needs to create a device with one slow sector for the purpose of testing, so he creates a device that has three targets: linear,delay,linear The problem with this setup is that flushes are forwarded to all three devices and it skews test results. So I created this patchset that allows to set zero delay for flushes. Mikulas -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel