LUN Behavior

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Operating Systems AIX LUN Behavior
# 1  
Old 09-20-2011
LUN Behavior

Aix 6.1, working with a nim master and nim_altmaster

both LPARS have access to the same data LUN, /nimdisk

I do realize the risks of having 2 servers access the same LUN, however it serves the purpose of being able to restore mksysb's to/from our DR site if necessary, at least in theory Smilie

I disabled reserve_lock on the hdiskpower device, so I can successfully import the VG on the alternate master, and everything appears to be there. The problem is, when I write to the disk from one client, I dont see the changes right away on the other client.

I know this post is sort of disogranized but I'm just curious if any of you have any thoughts on this.

# 2  
Old 09-20-2011
You have the file system mounted on both nodes at the same time?
JFS2 does not support that, file system corruption is likely to occur...
# 3  
Old 09-20-2011
instead of messing around with pseudo shared filesystems where you will most likely corrupt your content anyways, it might be better to just export the filesystem on one node and nfs mount it on the other box.
If you want a real shared (active-active) filesystem than go with gpfs

# 4  
Old 09-22-2011
Thanks. It does not need to be mounted on both boxes at the same time, but for my test, thats what I did. In theory the 2nd box would be a standby server that I would just be importing the VG from the SAN volume in a DR situation.
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