Are there any good packages (or just places to look) to observe and track kernel behavior (other than to add such and build a custom kernel)? I'm doing some performance analysis on different types of i/os on different file systems, and I need far more sophisticated information than iostat or vmstat produce. Any useful suggestions would be appreciated. Thanks. -- Mark Hull-Richter DATAllegro (www.datallegro.com) 85 Enterprise, 2nd Floor, Aliso Viejo, CA 92656 Ofc: 949-680-3082 fax: 949-680-3001