My biggest concern has been more making sure that Oracle doesn't have to fight to get memory, which it does now. There's definite performance uptick during the process of releasing ARC cache memory to allow Oracle to get what it's asking for and this is passed on to the application. The problem has been that, while considering percentages of total memory as being limits for ARC cache, it makes sense with 8 or 16GB RAM to be sure that ARC has a reasonable local cache, but I can't imagine so much kernel memory for 128GB. I'm still working with the older paradigm that it's better to leave 80% of my RAM doing nothing 80% of the time because of the performance benefit I get the %20 of the time I need it to grab it quickly. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
