Speed up metasync

It’s amazing how slowly a resync happens with Solaris Volumen Manager (SVM). You can dramatically reduce your time to sync up your mirrors with SVM by adding a setting to /etc/system and rebooting.

set md_mirror:md_resync_bufsz = 1024

I’ve tried 2048 (the max) as well, but not as big a gain in speed, so I stick with 1024.

Harmless on “modern” Sun machines. Just don’t try this on your SPARC 20 or it may lock up on you. As long as you have >1GB of RAM you’ll probably be ok.