Getting Error : ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51 error=0 in NetScaler

The resolution would be to FRU underneath hyper V HDD or to move VM to different HYPER-V

If you still see same HDD errors "ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51 ", "ad0: TIMEOUT - WRITE_DMA retrying " and then vmcore, then move the NetScaler VM to a different disk. 

 

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Problem Cause

Cause: 
As per dmesg.boot and message logs, we can see VPX reports ad0 (HDD) related error “ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51 “, “ad0: TIMEOUT - WRITE_DMA retrying “ before vmcore. 

Log Findings:
Error: 

<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 

dmesg.boot Logs:

ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 

Repetitive errors for the same event can be find in ns.log / messages :

<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
 <kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
 <kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
 <kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> msnsi01 kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 
<kern.crit> ns kernel: ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51<READY,DSC,ERROR> error=0 

We can also see sometimes VMCore generated at same timestamp when the error get generated: 

Jul 1 09:44:07 <local0.info> msnsi01 nsppe: PPE-0 : Lower PE :Debug Info 1: 0xbe5fb45c 0x70b0d1ed 0x4bca236b 0x2315c829 0xe2257a8e 0x9482d0f3 0xdd31d568 0x42339707 0x4bca236b 0x2315c829 

Jun 23 22:45:17 <local0.info> msnsi01 nsppe: PPE-0 : Lower PE :Debug Info 1: 0xbb350d0a 0xef3f829a 0x31d0ebb5 0xb8776cf6 0xcd8c9c52 0x42e8a3d7 0xb40fda25 0xf0ea1cff 0x31d0ebb5 0xb8776cf6 

The objective of this article is to show how to stop NetScaler Crash / Hung / Stuck if getting error "Error : ad0: FAILURE - SETFEATURES ENABLE WCACHE status=51 error=0" which is getting caused due to Virtual disk.

As per the past cases the same error only occured only with VM's hosted on Hyper V platform.