zfs on 4k sector disks

[S M]

I found that playing with either:

(sysctl) vfs.zfs.txg.write_limit_override

or

(boot/loader.conf) vfs.zfs.txg.timeout=5
(boot/loader.conf) vfs.zfs.txg.synctime=5

Helped with the write problem. What seems to happen is that zfs' calculations go slightly wrong if you have a lot of RAM and therefore zfs buffers too much, forcing so many writes that you lose all read IO for a few seconds....



 		 	   		  
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