10400424-002 04/2013
©2013 Overland Storage, Inc.
3-34
SnapSAN S3000/S5000 Path Manager Linux User Guide
Naming Rules
For example, the device file for the first partition of the first LUN is named /dev/dda1. About
major number, PathManager uses 245.
The number of LUN that PathManager can use depends on its function version.
Available Maximum number of LUN
m: the number of multiplexed paths per a device
[ ]: truncate after the decimal point
Maximum number of LUN
(in the case the number of redundant paths is 2, 4, 6, or 8)
PathManager cannot recognize the path information exactly with an environment exceeding
the above limitation.
Don't use PathManager on the environment over the limitation.
Intermittent Error Monitoring Function
Intermittent Error Monitoring Function prevents PathManager from continuing to use the
intermittent error path. "Intermittent error" means that some failures occurred but I/O is
succeeded by retrying some times.
If this function is set enabled, PathManager blocks a path which is suspected of being failed
and configures the path not to be recovered automatically. This prevents the system from
decreasing the I/O performance.
If you use this function, change the configuration because the default value of this function
is "Disable".
*If the statuses of all paths come to fault and there are some paths which is blocked by this
function, PathManager tries to recover the blocked paths and use it.
Type
Symbol
Remarks
Base name
dd
Fixed
Unit name
a,b,c…x,y,z
aa,ab,ac…ax,ay,az
ba,bb,bc…
One-to-one
correspondence with
LUNs
Partition number 1 to 15
Entire LUN when no
number is specified
Number of Redundant
Paths on a
device.
Function Version
2
4
6
8
5.0.0 or later
512
256
170
128
from 3.0.2 to less than
5.0.0
256
128
85
64