Hi Bastian, Am 17.08.2015 um 15:45 schrieb Bastian Blank: > Hi Christoph > > On Mon, Aug 17, 2015 at 03:23:32PM +0200, Christoph Martin wrote: >> do you see a way to get the tools/hv daemons into the 3.16 kernel for >> jessie in a point release? > > It will show up in backports.
In backports with 4.1 kernel? Would this package depend on the 4.1 kernel or would it be installable with a 3.16 kernel? I could test if the 4.1 binary would run correctly with a 3.16 kernel. > >> There are a lot of jessie machines running inside HyperV which will need >> it as soon as the new backup method of HyperV servers is used. > > Can you explain that a bit more? Windows HyperV 2012 R2 has a feature called "Live virtual machine backup". To support this from Linux machines you need to run the vss_daemon. HyperV will send a message to this daemon to shortly freeze the filesystems to make HyperV able to make a consistent snapshot for a backup. The deamon will pass this request to the kernel. This functionality is in 3.16 kernel. Here are the M$ docs for Debian and Ubuntu: https://technet.microsoft.com/en-US/library/dn614985.aspx https://technet.microsoft.com/en-us/library/dn531029.aspx If you don't run the daemon you might get an I/O error from the virtual hardware witch results in a readonly fs and possible fs corruption. We encounted this several times in the last year and it took us a long time to find the cause. Since this is in HyperV since 2012 I consider it really important to get into jessie main or at least officially working for kernel 3.16. Yours Christoph PS: Am am at debconf, if you are there too and want to talk.
