Network and Storage Protocols

Chronic ISCSI / storage failover / failback issue

amf
NetApp
3,216 Views

I am assigned to work on this chronic ISCSI/storage failover/failback  issue.

 

So here is the issue:

 

Everytime there is storage failover, the host loses the lun connectivity and there is timeout. Servers needs to be either rebooted or the luns needs to be rescanned in order to connect back. Any thoughts/suggesstions/soulutions would be appreciated. 

 

Thanks,

amf

4 REPLIES 4

SeanHatfield
3,188 Views

The SAN host(s) may require remediation.

First validate the config against the IMT, then perform any required updates.

 

Likely causes:

-Lack of MPIO, or misconfigured MPIO (if cDOT)

-misconfigured CFO (if 7mode)

-misconfigured network switch (spanning-tree/portfast)

-Missing HUK.

-Unsupported SAN host

 

 

 

If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.

paulstringfellow
3,173 Views
Out of interest what OS are the hosts running, if they're esx hosts I would also pursue vmware, this reconnection issue is a general esx problem.

SeanHatfield
3,142 Views

Thats a good point.  For VMware hosts the recommended settings should be applied with the VSC, some of which require a host reboot to take effect.  Some guest instances may need timeouts set as well.

 

 

 

If this post resolved your issue, help others by selecting ACCEPT AS SOLUTION or adding a KUDO.

amf
NetApp
3,129 Views

Physical Servers running Windows 2008 R2

Public