1What:		/sys/bus/xen-backend/devices/*/devtype
2Date:		Feb 2009
3KernelVersion:	2.6.38
4Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
5Description:
6                The type of the device.  e.g., one of: 'vbd' (block),
7                'vif' (network), or 'vfb' (framebuffer).
8
9What:		/sys/bus/xen-backend/devices/*/nodename
10Date:		Feb 2009
11KernelVersion:	2.6.38
12Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
13Description:
14                XenStore node (under /local/domain/NNN/) for this
15                backend device.
16
17What:		/sys/bus/xen-backend/devices/vbd-*/physical_device
18Date:		April 2011
19KernelVersion:	3.0
20Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
21Description:
22                The major:minor number (in hexidecimal) of the
23                physical device providing the storage for this backend
24                block device.
25
26What:		/sys/bus/xen-backend/devices/vbd-*/mode
27Date:		April 2011
28KernelVersion:	3.0
29Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
30Description:
31                Whether the block device is read-only ('r') or
32                read-write ('w').
33
34What:		/sys/bus/xen-backend/devices/vbd-*/statistics/f_req
35Date:		April 2011
36KernelVersion:	3.0
37Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
38Description:
39                Number of flush requests from the frontend.
40
41What:		/sys/bus/xen-backend/devices/vbd-*/statistics/oo_req
42Date:		April 2011
43KernelVersion:	3.0
44Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
45Description:
46                Number of requests delayed because the backend was too
47                busy processing previous requests.
48
49What:		/sys/bus/xen-backend/devices/vbd-*/statistics/rd_req
50Date:		April 2011
51KernelVersion:	3.0
52Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
53Description:
54                Number of read requests from the frontend.
55
56What:		/sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect
57Date:		April 2011
58KernelVersion:	3.0
59Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
60Description:
61                Number of sectors read by the frontend.
62
63What:		/sys/bus/xen-backend/devices/vbd-*/statistics/wr_req
64Date:		April 2011
65KernelVersion:	3.0
66Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
67Description:
68                Number of write requests from the frontend.
69
70What:		/sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect
71Date:		April 2011
72KernelVersion:	3.0
73Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
74Description:
75                Number of sectors written by the frontend.
76
77What:           /sys/module/xen_blkback/parameters/max_buffer_pages
78Date:           March 2013
79KernelVersion:  3.10
80Contact:        Roger Pau Monné <roger.pau@citrix.com>
81Description:
82                Maximum number of free pages to keep in each block
83                backend buffer.
84
85What:           /sys/module/xen_blkback/parameters/max_persistent_grants
86Date:           March 2013
87KernelVersion:  3.10
88Contact:        Roger Pau Monné <roger.pau@citrix.com>
89Description:
90                Maximum number of grants to map persistently in
91                blkback. If the frontend tries to use more than
92                max_persistent_grants, the LRU kicks in and starts
93                removing 5% of max_persistent_grants every 100ms.
94