HP StorageWorks Modular Smart Array 1000 HP Array Configuration Utility User G - Page 57

Setting the preferred path mode, Assigning a redundant controller to a logical drive

Get HP StorageWorks Modular Smart Array 1000 PDF manuals and user guides View all HP StorageWorks Modular Smart Array 1000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 57 highlights

Setting the preferred path mode The preferred path mode determines how I/O traffic to the logical drives is managed on controllers that are in an active/active configuration. • In Automatic mode, the storage system automatically selects a suitable path for I/O traffic to each logical drive depending on the host I/O patterns at the time. Because the optimum path can vary with time, I/O traffic for any given logical drive can be directed through either controller. • In Manual mode, all I/O traffic to a given logical drive is directed through a designated controller. In this case, you must also specify the preferred controller for each logical drive ("Assigning a redundant controller to a logical drive" on page 57). Syntax: modify [preferredpathmode=automatic|manual|?] where is a redundant controller. Example command: controller ch="lab 3" modify ppm=manual Assigning a redundant controller to a logical drive When you have set the preferred path mode ("Setting the preferred path mode" on page 57) in a redundant system to Manual, you must use the chassisslot command to assign each logical drive in the system to one of the redundant controllers. Syntax: modify [chassisslot=#|?] where is a valid logical drive on a controller that is in an active/active configuration and # denotes the chassis slot number of the redundant controller. (To obtain the chassis slot number, use the show command on the controller.) Example command: controller ch="lab 3" ld 1 modify chs=2 Rescanning the system A rescan detects devices that have been added to the system since the previous rescan or since the ACU CLI was started, whichever is more recent. Syntax: Use the word rescan directly at the ACU CLI prompt, without any target device or parameters. Example command: => rescan Using the Command Line Interface 57

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
Using the Command Line Interface
57
Setting the preferred path mode
The preferred path mode determines how I/O traffic to the logical drives is managed on controllers that
are in an active/active configuration.
•
In Automatic mode, the storage system automatically selects a suitable path for I/O traffic to each
logical drive depending on the host I/O patterns at the time. Because the optimum path can vary
with time, I/O traffic for any given logical drive can be directed through either controller.
•
In Manual mode, all I/O traffic to a given logical drive is directed through a designated controller.
In this case, you must also specify the preferred controller for each logical drive ("
Assigning a
redundant controller to a logical drive
" on page
57
).
Syntax:
<target> modify [preferredpathmode=automatic|manual|?]
where
<target>
is a redundant controller.
Example command:
controller ch="lab 3" modify ppm=manual
Assigning a redundant controller to a logical drive
When you have set the preferred path mode ("
Setting the preferred path mode
" on page
57
) in a
redundant system to Manual, you must use the
chassisslot
command to assign each logical drive in
the system to one of the redundant controllers.
Syntax:
<target> modify [chassisslot=#|?]
where
<target>
is a valid logical drive on a controller that is in an active/active configuration and #
denotes the chassis slot number of the redundant controller. (To obtain the chassis slot number, use the
show
command on the controller.)
Example command:
controller ch="lab 3" ld 1 modify chs=2
Rescanning the system
A rescan detects devices that have been added to the system since the previous rescan or since the ACU
CLI was started, whichever is more recent.
Syntax:
Use the word
rescan
directly at the ACU CLI prompt, without any target device or parameters.
Example command:
=> rescan