> Hi,
> What are the disadvantages of increasing the replacement_timeout to
> large values?

If you use multipath you want this value short. If you do not use 
multipath you want this longer. See the README on open-iscsi.org for how 
to tune. The non-multipath case and the iscsi root are similar.

> Are there alternate ways to prevent a device from going into RO mode
> during intermittent network failures?

Use dm-multipath. Using multipath is the best way to handle this 
problem. If your target has two ports or you are using a software target 
and the box has multiple nics use them and do multipath.

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