Dell PowerConnect W-Airwave W-Airwave 7.1 Sizing Guide - Page 7

The second partition will required 2 SAS/SCSI drives in a RAID-1 configuration supplied via a hardware controller. Both drives must have 15K RPM spindle speeds. This partition will contain the operating system. Note: Please contact http://support.dell.com when purchasing or configuring any hardware platform servicing more than 2,500 devices. AWMS servers servicing more than 2,500 devices require 64-bit OS and AWMS 7.1 or higher. Do not use software raid systems or SATA disk drives. Disk Partitioning AWMS automatically partitions the disk subsystem upon installation. You can override these values. The table below lists the default partitioning and provides guidance for more advanced scenarios. Default Partitions boot swap / Size 100 MB Twice size of RAM Rest of disk space Default Partitions boot swap / /alternative /var/log /var/lib/pgsql /var/airwave/rrd /var/airwave-backup Purpose Boot partition Swap partition AWMS Database backup location All log from all services PostgreSQL database files Statistical flat files Nightly backup location Recommended Size 100 MB Twice size of RAM 25% of total disk space 10% of total disk space 5% of total disk space 25% of total disk space 25% of total disk space 10% of total disk space Note: Please ensure the disk subsystem can sustain these random write rates. Sustained sequential write rates will not help, because AWMS writes are primarily random. There could be upgrade or installation issues when manually partitioning your disk subsystem. Storage System Tuning  Ensure all disks are configured to "One Virtual Disk".  If the RAID controller has battery-backed cache, ensure the Write Policy is configured to "WriteBack", otherwise ensure it is configured to "Write-Through".