Dell PowerStore 5200T EMC PowerStore Host Configuration Guide - Page 74

Dynamic Tracking, Fibre Channel Adapter Device Driver Maximum I/O Size

Get Dell PowerStore 5200T PDF manuals and user guides View all Dell PowerStore 5200T manuals
Add to My Manuals
Save this manual to your list of manuals

Page 74 highlights

NOTE: The -P flag only modifies the setting in the ODM and requires a system reboot for the changes to apply. Fast fail logic is applied when the switch sends a Registered State Change Notification (RSCN) to the adapter driver, indicating a link event with a remote storage device port. Fast I/O Failure is useful when multipathing software is used. Setting the fc_err_recov attribute to fast_fail can decrease I/O failure due to link loss between the storage device and switch, by supporting faster failover to alternate paths. Dynamic Tracking This topic describes the dynamic tracking logic for FC devices and details the setting recommendations. Dynamic tracking logic is applied when the adapter driver receives an indication from the switch that a link event with a remote storage device port has occurred. If dynamic tracking of FC devices is enabled, the FC adapter driver detects when the Fibre Channel N_Port ID of a device changes. The FC adapter driver then reroutes the traffic that is destined for that device to the new address, while the devices are still online. Events that can cause an N_Port ID to change include: ● Moving a cable that connects a switch to a storage device from one switch port to another. ● Connecting two separate switches using an Inter-Switch Link (ISL). ● Rebooting a switch. The fscsi device attribute dyntrk controls dynamic tracking of FC devices (default value is no for non-NPIV configurations). It is recommended to enable dynamic tracking for PowerStore volumes. To enable dynamic tracking for FC devices, change all fscsi device attributes to dyntrk=yes, as shown in the following example: NOTE: In the example, the fscsi device instance is fscsi0. chdev -l fscsi0 -a dyntrk=yes -P Run the following command to verify that the setting was enabled in the ODM: lsattr -El fscsi0 NOTE: The -P flag only modifies the setting in the ODM and requires a system reboot for the changes to apply. Fibre Channel Adapter Device Driver Maximum I/O Size Set the max_xfer_size attribute for optimal AIX host operation over FC with PowerStore. Prerequisites The max_xfer_size FC HBA adapter device driver attribute for the fscsi device controls the maximum I/O size that the adapter device driver can handle. This attribute also controls a memory area that the adapter uses for data transfers. For optimal AIX host operation over FC with PowerStore, perform the following steps: Steps 1. Run the following command on all FC adapters that are connected to PowerStore: chdev -l fcs0 -a max_xfer_size=0x100000 -P 2. Reboot the AIX host to apply the max_xfer_size setting adjustments. NOTE: For virtualized AIX hosts, ensure to apply the max_xfer_size setting adjustments on all LPARs of the host that is connected to PowerStore storage. 74 Host Configuration for AIX

  • 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
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
NOTE:
The
-P
flag only modifies the setting in the ODM and requires a system reboot for the changes to apply.
Fast fail logic is applied when the switch sends a Registered State Change Notification (RSCN) to the adapter driver, indicating
a link event with a remote storage device port.
Fast I/O Failure is useful when multipathing software is used. Setting the
fc_err_recov
attribute to
fast_fail
can
decrease I/O failure due to link loss between the storage device and switch, by supporting faster failover to alternate paths.
Dynamic Tracking
This topic describes the dynamic tracking logic for FC devices and details the setting recommendations.
Dynamic tracking logic is applied when the adapter driver receives an indication from the switch that a link event with a remote
storage device port has occurred.
If dynamic tracking of FC devices is enabled, the FC adapter driver detects when the Fibre Channel N_Port ID of a device
changes. The FC adapter driver then reroutes the traffic that is destined for that device to the new address, while the devices
are still online.
Events that can cause an N_Port ID to change include:
●
Moving a cable that connects a switch to a storage device from one switch port to another.
●
Connecting two separate switches using an Inter-Switch Link (ISL).
●
Rebooting a switch.
The fscsi device attribute
dyntrk
controls dynamic tracking of FC devices (default value is no for non-NPIV configurations).
It is recommended to enable dynamic tracking for PowerStore volumes.
To enable dynamic tracking for FC devices, change all fscsi device attributes to
dyntrk=yes
, as shown in the following
example:
NOTE:
In the example, the fscsi device instance is fscsi0.
chdev -l fscsi0 -a dyntrk=yes -P
Run the following command to verify that the setting was enabled in the ODM:
lsattr -El fscsi0
NOTE:
The
-P
flag only modifies the setting in the ODM and requires a system reboot for the changes to apply.
Fibre Channel Adapter Device Driver Maximum I/O Size
Set the
max_xfer_size
attribute for optimal AIX host operation over FC with PowerStore.
Prerequisites
The
max_xfer_size
FC HBA adapter device driver attribute for the fscsi device controls the maximum I/O size that the
adapter device driver can handle. This attribute also controls a memory area that the adapter uses for data transfers.
For optimal AIX host operation over FC with PowerStore, perform the following steps:
Steps
1.
Run the following command on all FC adapters that are connected to PowerStore:
chdev -l fcs0 -a max_xfer_size=0x100000 -P
2.
Reboot the AIX host to apply the
max_xfer_size
setting adjustments.
NOTE:
For virtualized AIX hosts, ensure to apply the
max_xfer_size
setting adjustments on all LPARs of the host
that is connected to PowerStore storage.
74
Host Configuration for AIX