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February 16, 2009
RAID on Linux: tuning and troubleshooting, v. 2.65
Abstract
In order to animate a database server (MySQL and PostgreSQL) in an OLTP (mostly read requests, data occupying approx 800GB) context I bought (November 2006) a 3ware disk controller connected to a SuperMicro mainboard, bi-Xeon bi-core (hyperthreading OFF) 3.2 GHz, model 6, stepping 4, 2 MB L0 cache, 12 GB RAM, running Debian (etch) Linux AMD64 (2.6.18, now 2.6.24.2, no patches).On the RAID side I compared 3ware integrated functions to the 'md' Linux driver (beware: 'md' is not 'dm' (which is ATAPI RAID)).
This induced major performance-related problems. This document describes this process and offers hints, especially useful to the beginner, when it comes to measuring or enhancing disk performance under Linux.
RAID on Linux: tuning and troubleshooting, v. 2.65
Posted by thdyck on February 16, 2009
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