On Aug 30, 2021, at 7:14 PM, Xiubo Li 
<xiu...@redhat.com<mailto:xiu...@redhat.com>> wrote:


We are using “Most Recently Used” - however there are 50 ESXi hosts all trying 
to access the same data stores, so it’s very possible that one host is choosing 
iSCSI gateway 1 and another host is choosing iSCSI gateway 2.

If so, you need to fix this.


I did a quick test where I re-enabled a second iSCSI gateway to take a closer 
look at the paths on the ESXi hosts and I definitely see that when the second 
path becomes available, different hosts are pointing to different gateways for 
the Active I/O Path.

I was reading on how ALUA works and as far as I can tell, isn’t CEPH supposed 
to indicate to the ESXi hosts which iSCSI gateway “owns” a given LUN at any 
point so that the hosts know which path to make active? Could there be 
something wrong where more than one iSCSI gateway is advertising that it owns 
the LUN to the ESXi hosts?

-Paul

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