NAS issue

~ # esxcli storage nfs list
Volume Name  Host          Share       Accessible  Mounted  Read-Only  Hardware Acceleration
-----------  ------------  ----------  ----------  -------  ---------  ---------------------
NAS          192.168.1.10  /mnt/HD_a2       false     true      false  Unknown

I am trying to restart the service associated with NAS on ESXi 5.5
linuxpersonAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Remove the data store.
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linuxpersonAuthor Commented:
/var/log # esxcli storage nfs remove -v NAS
Sysinfo error on operation returned status : Busy. Please see the VMkernel log for detailed error information


2015-02-27T15:52:14.964Z cpu1:1145457 opID=5efc6c60)World: 14299: VC opID hostd-9d3b maps to vmkernel opID 5efc6c60
2015-02-27T15:52:14.973Z cpu4:1145689 opID=4f78f26d)World: 14299: VC opID hostd-aadb maps to vmkernel opID 4f78f26d
2015-02-27T15:52:14.973Z cpu4:1145689 opID=4f78f26d)WARNING: NFS: 1921: NAS has open files, cannot be unmounted
2015-02-27T15:52:14.978Z cpu1:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:14.984Z cpu1:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:14.993Z cpu0:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:14.997Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:15.000Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:15.004Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:15.007Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:15.010Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e, max=12
2015-02-27T15:52:15.016Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'mpx.vmhba0:C0:T0:L0': Not supported
2015-02-27T15:52:15.018Z cpu3:1145461)Vol3: 716: Couldn't read volume header from control: Not supported
2015-02-27T15:52:15.018Z cpu3:1145461)Vol3: 716: Couldn't read volume header fro
2015-02-27T15:52:15.018Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'co
2015-02-27T15:52:15.042Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'mp
2015-02-27T15:52:15.048Z cpu3:1145461)VC: 2059: Device rescan time 18 msec (tota
2015-02-27T15:52:15.048Z cpu3:1145461)VC: 2062: Filesystem probe time 54 msec (d
2015-02-27T15:52:15.048Z cpu3:1145461)VC: 2064: Refresh open volume time 0 msec
2015-02-27T15:52:15.048Z cpu7:1145446)World: 14299: VC opID hostd-9d3b maps to v
2015-02-27T15:52:15.052Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.061Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.069Z cpu3:1145461)Vol3: 716: Couldn't read volume header fro
2015-02-27T15:52:15.069Z cpu3:1145461)Vol3: 716: Couldn't read volume header fro
2015-02-27T15:52:15.069Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'co
2015-02-27T15:52:15.093Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'mp
2015-02-27T15:52:15.095Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.098Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.101Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.104Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.107Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.110Z cpu3:1145461)<3>ata1.00: bad CDB len=16, scsi_op=0x9e,
2015-02-27T15:52:15.116Z cpu3:1145461)FSS: 5091: No FS driver claimed device 'mp
2015-02-27T15:52:15.117Z cpu3:1145461)VC: 2059: Device rescan time 15 msec (tota
2015-02-27T15:52:15.117Z cpu3:1145461)VC: 2062: Filesystem probe time 51 msec (d
2015-02-27T15:52:15.117Z cpu3:1145461)VC: 2064: Refresh open volume time 0 msec
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check there are no files in use or reboot the ESXi host server.

Also check your NAS is on the HCL.
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linuxpersonAuthor Commented:
HCL is fine other hosts are able to access.

I had this issue on two host. when I did reboot the other server, it came back.

I wonder is there any way to fix without rebooting.

/var/log # nc -z 192.168.1.10 2049
Connection to 192.168.1.10 2049 port [tcp/nfs] succeeded!
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Check what is using the data store.

If files are in use it will not allow dismount.

Check via GUI will check and tell you what is in use.
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linuxpersonAuthor Commented:
thanks it works now.

some cd/dvd rom connected in few VMs.
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