Case 1

Collecting Timeout Parameters

1. Run the lspath command to obtain the IDs of FC ports that are connected and enabled (indicated by Enableddisplayed on the first column). Obtain the IDs of FC ports (started with fscsi) on the last column. Record only one port if two or more ports are repetitive. As shown in the following figure, the host has two FC ports (fscsi0 and fscsi1) connected with the array.

   

   NOTE:

   • Ifthe host does not map to a LUN, no fscsiX will be displayed and the check ispassed.

   • Timeoutvalues include unchanged, changed, and NA.

   • Judgewhether the port is in Enable state.

2. Run the lsattr -El fscsiXcommand. fscsiXindicates a port ID obtained in step 1. Check the values of dyntrk and fc_err_recov.If dyntrk is yes and fc_err_recov is fast_fail, it indicates that the port attributes have been modified and the check is passed. Otherwise, the check is not passed and modification is required.

   

   CAUTION:

   If fc_err_recovis not set, a fault switchover will take about one minute. If fc_err_recov is setto fast_fail, a faultswitchover will take about only 20s.

Error When Querying HBA Timeout Settings

If the timeout setting of an HBA does not pass the check, the error information is as follows:

(Port ID: fscsi0)(Timeout：unchanged);
(Port ID: fscsi1)(Timeout：unchanged);

Modifying HBA Timeout Settings

NOTE:

• Ifattributes of all ports have been modified, skip the following steps.

• Runningthe attribute modification command one time modifies attributes of only oneport. You must modify the attributes of all ports connected to the storagearray.

• If the host can be restarted, perform the following operations:

  1. Run the chdev -l fscsi* -a dyntrk=yes -P command to modify HBA attributes.

  2. Restart the host for the settings to take effect.

• If the host cannot be restarted but the services can be stopped, perform the following operations:

  1. Run the lsdev -p fscsi* command to query all sub-devices that are connected to the HBA.

  Figure 1 Figure 1-1 Querying all sub-devices that are connected to the HBA

  

  1. Back up virtual disk permissions.

  Figure 2 Figure 1-2 Backing up virtual disk permissions

  

  1. Run rmdev -dl <sub-device name> to delete all sub-devices.In the command, <sub-device name> indicates each sub-device name obtained in the first step.

  2. Run chdev -l fscsiX -a dyntrk=yes and chdev -l fscsiX -a fc_err_cov=fast_fail to modify HBA attributes.

  3. Reconfigure disk permissions.

• If services cannot be interrupted and multiple ports on the host are connected to the storage array, perform the following operations (assuming that ports fscsi0and fscsi1 are connected to the storage array):

  1. Run rmdev -l fscsi0 -R to set the status of fscsi0to defined.

  2. and chdev -l fscsi0 -a fc_err_recov=fast_fail to modify the attributes of fscsi0.

  3. Run cfgmgr -l fcs0 to establish a link to fscsi0.

  4. Run lspathto confirm that the link to fscsi0 is recovered.

  5. Run rmdev -l fscsi1 -R.

  6. and chdev -l fscsi1 -a fc_err_recov=fast_fail to modify the attributes of fscsi1.

  7. Run cfgmgr -l fcs1.

  8. Run lspathto confirm that the link to fscsi1 is recovered.

• If services cannot be interrupted and only one port on the host is connected to the storage array, port attributes cannot be modified. Negotiate with the customer over service suspension.

CAUTION:

After the upgrade, restore thevalues of the timeout parameters to the original values.

Verifying the Modification of HBA Timeout Settings

The modification takes effect immediately but will become invalid after a restart. You can collect timeout parameters again for verification.

Recommended Actions

If you have any questions or any other exceptions exist, contact Huawei technical support.