On Wed, Jan 14, 2015 at 3:26 AM, Paul Clements <paul.cleme...@us.sios.com> wrote: > On Tue, Jan 13, 2015 at 11:14 AM, Andrey Utkin > <andrey.krieger.ut...@gmail.com> wrote: >> Hi Paul, >> could you please describe > >> - how wide is NBD usage today (any estimation is ok), > > It depends somewhat on who you consider to be users. There are two > groups of NBD "users": > > 1) integrators and admins (who work directly with nbd) > 2) users of the systems and software that the first group creates > > My guess is that the first group is in the hundreds. The second in the > thousands. NBD usage tends to fall into one the following classes: > > - support of diskless thin clients (mainly at universities and such) > - replication (used in conjunction with some form of mirroring scheme, > this becomes a network-raid device of sorts) > - block device emulation/user-level block device (e.g., qemu-nbd) > (because NBD has a fairly flexible design, including a fully > user-level server component, it has been used by quite a few people as > a user-level block device for various different purposes)
The 3rd one should have huge users since qemu-nbd is used to access VM image and Openstack(nova) uses it to launch VM instance. > >> - what is in a TODO list, > > Nothing specific, other than merging in pending patches, of which > there are a few (check the nbd-general archives). > >> - what are critical bugs or important issues requiring work, if there are >> any. > > There is a network timeout issue, which is probably one of the more > important fixes to get in: > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=770479 Last time I studied nbd driver a while to see if socket aio can be used to improve performance, but looks not get some fruits. Thanks, Ming Lei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
