|
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Virtualization project idea
On Fri, Aug 27, 2010 at 04:56:33PM +0530, Dhananjay Goel wrote: > Also you wouldn't see the changes made in other VMs, > unless you made sure all the caches are refreshed etc in the VM all the > time. > > You'd need to use some cluster-filesystem (GFS, GFS2, OCFS2, GPFS, etc). > --Can you please suggest how NFS manages this because this case is handled > by NFS without any corruption? > We can share flash drive across VMs as we do with physical machines in > LAN. Please help! > How are you sharing USB flash drives with physical machines? -- Pasi > Thanks, > Dhananjay > > On Fri, Aug 27, 2010 at 4:27 PM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote: > > On Fri, Aug 27, 2010 at 02:53:54PM +0530, Dhananjay Goel wrote: > > This won't be straight forward. Think about USB memory/flash stick. > > If every VM sees it, and simultaneously writes to it, the > filesystem > > in it will get corrupted immediately! > > > > --Why would it get corrupted immediately. Might be we can just lock > a > > specific file which is being edited? Please suggest. > > > > Because USB level has no idea about filesystems or files, or locking > them! > > Say you're using ext3 or NTFS in the VM for the USB device. > Those filesystems are NOT cluster-aware, ie. they're not aware of any > sharing, > and they don't support any kind of sharing. > > They expect exclusive access to the device. > > If suddenly the bits on the device change from outside, > the filesystem gets corrupted very easily. > > Also you wouldn't see the changes made in other VMs, > unless you made sure all the caches are refreshed etc in the VM all the > time. > > You'd need to use some cluster-filesystem (GFS, GFS2, OCFS2, GPFS, etc). > > -- Pasi > > > Thanks, > > Dhananjay > > > > On Fri, Aug 27, 2010 at 2:49 PM, Pasi Kärkkäinen > <[1][2]pasik@xxxxxx> wrote: > > > > On Fri, Aug 27, 2010 at 02:45:12PM +0530, Dhananjay Goel wrote: > > > No, that's not possible with pvusb. pvusb is for direct > passthru to > > > one/single vm. > > > You'd need some filesystem share (cifs/nfs/whatnot) to make > such > > sharing > > > possible. > > > Comments: Is it possible to share USB keyboard, USB mouse, > USB > > modem, etc > > > across VMs i.e host and guest(s)? If we connect USB > keyboard, is it > > > possible to use it in guests? > > > > > > > This is implemented in XCI (Xen Client Initiative), and there has > been > > some discussions how to get it traditional Xen, to help Xen VGA > > Passthrough usage. > > > > See: [2][3]http://wiki.xensource.com/xenwiki/XenVGAPassthrough > > > Also, is it possible for us to modify the device driver of > USB 2.0 > > so that > > > all USB 2.0 devices are visible and can be used across all > VMs? > > Please > > > suggest. > > > > > > > This won't be straight forward. Think about USB memory/flash > stick. > > If every VM sees it, and simultaneously writes to it, the > filesystem > > in it will get corrupted immediately! > > > > USB Passthru cannot be used to 'share' devices, it's for giving > > one/single VM > > direct access to the device. > > > > -- Pasi > > > > > Thanks, > > > Dhananjay > > > > > > On Fri, Aug 27, 2010 at 2:16 PM, Pasi Kärkkäinen > > <[1][3][4]pasik@xxxxxx> wrote: > > > > > > On Fri, Aug 27, 2010 at 01:37:49PM +0530, Dhananjay Goel > wrote: > > > > Hi James/Pasi, > > > > I had a look at > > > > [1][2][4][5]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > > > But I'm not sure if it supports sharing USB devices > across > > VMs > > > (host and > > > > guest) i.e. if I plug in a flash drive then it would > detect > > in both > > > host > > > > and guest and I'd be able edit files from all VMs > rather > > than > > > mounting and > > > > unmounting everytime from 1 VM to other. > > > > Please let me know your thoughts on it. > > > > > > > > > > No, that's not possible with pvusb. pvusb is for direct > passthru > > to > > > one/single vm. > > > You'd need some filesystem share (cifs/nfs/whatnot) to > make such > > sharing > > > possible. > > > > > > -- Pasi > > > > Thanks, > > > > Dhananjay > > > > > > > > On Fri, Aug 27, 2010 at 4:28 AM, James Harper > > > > <[2][3][5][6]james.harper@xxxxxxxxxxxxxxxx> wrote: > > > > > > > > > Hi there! > > > > > > > > > > First I'd like to say that XEN plaform is really > cool > > and > > > awesome. > > > > > > > > > > I'm an engineering student and is searching for a > > feasible > > > project in > > > > > virtualization. I'd like to know if its possible > to > > share USB > > > devices > > > > (flash > > > > > drive, hard disk, mouse, keyboards etc) across > guests > > and host > > > (VMs). > > > > Also, do > > > > > you have any idea to extend it? Or any innovative > idea > > so that > > > we can > > > > > implement it. > > > > > > > > > > I'd appreciate any help. Thanks in advance. > > > > > > > > > > > > > Further to what Pasi said, I have partially ported > the > > backend > > > interface > > > > and can hand you the code if you want. It's > probable a bit > > stale > > > vs the > > > > current kernels and leaks memory under some > circumstances > > but is > > > > probably better than starting from scratch. > > > > James > > > > > > > > References > > > > > > > > Visible links > > > > 1. > [4][6][7]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > > > 2. mailto:[5][7][8]james.harper@xxxxxxxxxxxxxxxx > > > > > > References > > > > > > Visible links > > > 1. mailto:[8][9]pasik@xxxxxx > > > 2. > [9][10]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > > 3. mailto:[10][11]james.harper@xxxxxxxxxxxxxxxx > > > 4. > [11][12]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > > 5. mailto:[12][13]james.harper@xxxxxxxxxxxxxxxx > > > > References > > > > Visible links > > 1. mailto:[14]pasik@xxxxxx > > 2. [15]http://wiki.xensource.com/xenwiki/XenVGAPassthrough > > 3. mailto:[16]pasik@xxxxxx > > 4. [17]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > 5. mailto:[18]james.harper@xxxxxxxxxxxxxxxx > > 6. [19]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > 7. mailto:[20]james.harper@xxxxxxxxxxxxxxxx > > 8. mailto:[21]pasik@xxxxxx > > 9. [22]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > 10. mailto:[23]james.harper@xxxxxxxxxxxxxxxx > > 11. [24]http://wiki.xensource.com/xenwiki/XenUSBPassthrough > > 12. mailto:[25]james.harper@xxxxxxxxxxxxxxxx > > References > > Visible links > 1. mailto:pasik@xxxxxx > 2. mailto:pasik@xxxxxx > 3. http://wiki.xensource.com/xenwiki/XenVGAPassthrough > 4. mailto:pasik@xxxxxx > 5. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 6. mailto:james.harper@xxxxxxxxxxxxxxxx > 7. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 8. mailto:james.harper@xxxxxxxxxxxxxxxx > 9. mailto:pasik@xxxxxx > 10. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 11. mailto:james.harper@xxxxxxxxxxxxxxxx > 12. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 13. mailto:james.harper@xxxxxxxxxxxxxxxx > 14. mailto:pasik@xxxxxx > 15. http://wiki.xensource.com/xenwiki/XenVGAPassthrough > 16. mailto:pasik@xxxxxx > 17. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 18. mailto:james.harper@xxxxxxxxxxxxxxxx > 19. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 20. mailto:james.harper@xxxxxxxxxxxxxxxx > 21. mailto:pasik@xxxxxx > 22. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 23. mailto:james.harper@xxxxxxxxxxxxxxxx > 24. http://wiki.xensource.com/xenwiki/XenUSBPassthrough > 25. mailto:james.harper@xxxxxxxxxxxxxxxx _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
|
 |
Lists.xenproject.org is hosted with RackSpace, monitoring our |