Hi Jonathan, I'm sorry for responding late. From: Jonathan Brassow <jbrassow@xxxxxxxxxx> Subject: Re: merging dm-ioband into Linux Date: Thu, 8 Jan 2009 12:05:09 -0600 > Perhaps it will help people to know that there is a good write-up about how it all works at the end of the patch found at: > http://people.valinux.co.jp/~ryov/dm-ioband/patches/dm-ioband-1.7.0.patch Thanks for the advice. > It seem interesting to me. (I'm still reading through the description and haven't started looking at the code.) I would also be happy if you give me any comments on the code. > Regarding: > + ioband_device_id > + > + The ID number for an ioband device. The same ID > + must be set among the ioband devices that share the > + same bandwidth, which means they work on the same > + physical disk. > ... but it doesn't have to be the same physical disk, right? It could be a group if disks if you felt the need to do something like that, right? (You could treat a JBOD as one unit.) Otherwise, you could probably eliminate this field. As you wrote, dm-ioband can treat a logical volume on different physical devices like this: http://people.valinux.co.jp/~ryov/dm-ioband/benchmark/lvm.html Thanks, Ryo Tsuruta -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
