[CentOS] iSCSI best practices

[lhecking at users.sourceforge.net]

> Outage is one thing, but having the disk volumes disappear mid-transaction can be detrimental to a file system's health.
 
 To get this back on-topic and closer to the OP's requests, are there any
 particular iscsi settings one should consider to increase resiliency and
 minimise the impact of e.g. a rebooting switch? timeout settings? The
 big disadvantage of iscsi is that you add another layer that can fail
 (compared to having virtual machine images on a local disk).