What are recommended COMSTAR settings for zvol FC targets?
I posted a question about using the writeback cache (wcd=false) on ZFS backed COMSTAR FC Targets in the Oracle Solaris ZFS File System (MOSC). The moderator suggested I also cross-post here.
My objective is to share an 84-disk JBOD to several CentOS clients for XFS (or possibly other) file-systems. My current plan is to utilize Solaris 11.x/ZFS to manage the disks and COMSTAR to share zvols over fibre channel to the CentOS clients.
By default, the writeback cache is enabled (wcd=false) and this provides good write performance in my testing. Disabling the writeback cache significantly reduces write performance -- by 100X in some cases. However, it sounds like "wcd=false" increases my exposure to data loss and/or corruption in the event of a server crash or power-loss. I am wondering what I can do to mitigate this risk.