[Xen-users] Xen SR NFS mount options = soft

[Kelvin Vanderlip <kelvin.vanderlip@xxxxxxxxxxxx>]

Dear Xen community,

We are running XenServer 6.02 and 6.1, using NFS mounts from a Nexenta ZFS file system as our Storage Repositories.

Occasionally, the Nexenta system freezes for up to 50 to 2 minutes seconds (no idea on that yet), which should not hurt the Xen guests as its just a temporary freeze of an NFS share.

However, the XenServer hypervisor mounts its NFS storage repositories with the option "soft", so the SRs just disconnect. Major mayhem ensues as the virtual guests put their root file systems into read-only mode.

I have not figured out how to NFS mount a Xen Storage Repository on a Xenserver with the "hard" option.

Here is what "nfsstat -m" shows for our hypervisor's NFS mount options (note the 'soft' item on each SR)

[root@new-ucsc1b1 ~]# nfsstat -m

/var/run/sr-mount/92bf4ab7-8ce9-ed6a-a04a-e7b3c0e3348b from 10.10.15.247:/volumes/dev0/XEN_6.1_SR/92bf4ab7-8ce9-ed6a-a04a-e7b3c0e3348b

 Flags: rw,sync,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,acregmin=0,acregmax=0,acdirmin=0,acdirmax=0,soft,noac,proto=tcp,port=65535,timeo=133,retrans=0,sec=sys,mountport=65535,local_lock=none,addr=10.10.15.247

/var/run/sr-mount/95144379-5caf-cc1b-1861-39825b4bbe7b from 10.10.8.137:/backup

 Flags: rw,sync,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,acregmin=0,acregmax=0,acdirmin=0,acdirmax=0,soft,noac,proto=tcp,port=65535,timeo=133,retrans=0,sec=sys,mountport=65535,local_lock=none,addr=10.10.8.137

/var/run/sr-mount/6bcb8d28-99bd-a803-f6b0-5c43a1cdbb96 from 10.10.15.247:/volumes/dev0/XEN_6.1_SR_hard/6bcb8d28-99bd-a803-f6b0-5c43a1cdbb96

 Flags: rw,sync,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,acregmin=0,acregmax=0,acdirmin=0,acdirmax=0,soft,noac,proto=tcp,port=65535,timeo=133,retrans=0,sec=sys,mountport=65535,local_lock=none,addr=10.10.15.247

Does anyone know how to NFS mount a Xen Storage Repository 'hard'?

Thank you,

Kel

Kelvin Vanderlip
I.T. Systems Administration
Sunrider Torrance
"The biggest single problem in communication is the illusion that it has taken place"

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