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

[Kelvin Vanderlip <kelvin.vanderlip@xxxxxxxxxxxx>]

Thank you, Joseph, you are a star.  I spent quite a while trying to use the "Advanced Options" text box in XenCenter's NFS SR dialogue without any effect on anything. No one except you knew where those options could be set. Its odd that NFS options are set in code, not data.

I found a discussion on NFS mount options here http://forums.citrix.com/thread.jspa?threadID=274380&tstart=0 with a nice analysis by Colin Hutcheson. I'll work a few test NFS crashes and let you know how "rw,tcp,bg,hard,intr,sync,noac,rsize=32768,wsize=32768,timeo=600,retrans=2,_netdev" works for me.

With best regards,

Kel

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

On Mon, Jul 8, 2013 at 7:30 AM, Joseph Hom <jhom@xxxxxxxxxxxxx> wrote:

Look at /opt/xensource/sm/nfs.py

 

The nfs mount options are hard coded in the soft_mount function. You can change the options in there.

 

From: xen-users-bounces@xxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxx] On Behalf Of Kelvin Vanderlip
Sent: Friday, July 05, 2013 6:17 PM
To: xen-users@xxxxxxxxxxxxx
Subject: [Xen-users] Xen SR NFS mount options = soft

 

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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