Sorry. Edited the wrong line in the --compose screen. Due to the lack of subject I guess it is going into some spam filters. Here is the mail: On 03/10/2016 12:34 AM, Mike Christie wrote: > The following patches made over the ceph master branch > implement OSD side support for VMware VAAI's Atomic Test > and Set (ATS) and Write Same (Zero) requests. > > ATS is used for operations like locking and heartbeats. It > is implemented by as the SCSI COMPARE_AND_WRITE command which > requires the device to read N blocks, compare them to data > sent with the command, and if equal, write N blocks. > > Zero is used to initialize blocks to zero. It is implemented > as the SCSI WRITE_SAME command which passes the device a > block's worth of data and has it write it multiple times. > > This does not include support for XCOPY/extended copy. I > am still looking into this, but it seems it might be > difficult to support due to rbd being more tuned to cloning > entire devices. When we implement VASA, the cloneVirtualVolume > might be something we can support though. > > More info on VAAI can be found here: > http://www.vmware.com/resources/techresources/10337 > > The krbd patches which use these requests are in vaai branch of > this tree: > https://github.com/mikechristie/linux-kernel > > I did not submit them in this thread, because they depend on other > patches that are still being reviewed upstream and I did not want > to waste people's time reviewing them if they change. These OSD side > patches should be ok to review and merge, because the op format > and implemention should not change. > > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
