A reminder of the URL for a great Best practices Wiki. There are Application-specific Best Practices entry (Oracle RDBMS, SAP, MySQL, PostgreSQL, Apache...), a lot of info on ZFS Best Practices, ...and many more.
This wiki the companion to the Solaris Internals Book.
I've also added the URL to the 'cool links' section on this blog.
40 amd benchmarks blackbox blade blogwatch cmt cryptography e25k e6900 eco fire fluent hp hpc ibm intel itanium itanium2 java jvm linpack linux lotus m8000 m9000 mcad mysql nehalem networking niagara opensolaris opensource opensparc opteron oracle p595 performance power power5+ power6 powerflow record sap sap-sd scaling solaris sparc sparc64 spc-2 spec specapc specfp_rate2006 specint_rate2000 specint_rate2006 specjappserver specjappserver2004 specjbb specjbb2005 specomp specomp2001 specompl2001 specompm2001 specpower storage storagetek studio studio11 sun sunstorage7000 sunw suse swap t1 t2 t2000 t5120 t5220 t5440 tpc-c tpc-e tpc-h ultra ultrasparc us-iv+ utilization virtualization watt/performance wattage watts web2.0 woodcrest x4100 x4200 x4500 x4600 x6250 x64 xeon zfs
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