Dell PowerConnect W-Airwave 7.2 Manual de usuario descargar pdf (Pagina 11)

Dell PowerConnect W AirWave 7.2 | Sizing Guide CPU, BIOS, Operating Systems, and Storage | 9

Disk Partitioning

AWMS automatically partitions the disk subsystem upon installation. You can override these values. Table 5 and

Table 6 below list the default partitioning and provides guidance for more advanced scenarios.

Storage System Tuning

For RAID 10:

 Ensure that all disks are configured to "One Virtual Disk".

 If the RAID controller has battery-backed cache, ensure the Write Policy is configured to "Write-Back",

otherwise ensure it is configured to "Write-Through".

CentOS and RH Linux include four custom schedulers to handle I/O:

 CFQ - Completely Fair Queuing is the default algorithm

 Deadline elevator - uses a deadline algorithm to minimize I/O latency

 NOOP scheduler -a simple FIFO

 Anticipatory elevator - introduces a small delay before dispatching the I/O

Table 5 Default Partitions

Default Partitions Size

boot 100 MB

swap Twice size of RAM

/ Rest of disk space

Table 6

Advanced Partitions

Default Partitions Purpose Recommended Size

boot Boot partition 100 MB

swap Swap partition Twice size of RAM

/ AWMS 25% of total disk space

/alternative Database backup location 10% of total disk space

/var/log All log from all services 5% of total disk space

/var/lib/pgsql PostgreSQL database files 25% of total disk space

/var/airwave/rrd Statistical flat files 25% of total disk space

/var/airwave-backup Nightly backup location 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. For platforms servicing more than 2,500 devices, all "var" partitions should be located

on SSDs.

You may experience upgrade or installation issues when manually partitioning your disk subsystem. Symbolic links are not

recommended when configuring disk subsystem because of backup and restoration issues.

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Dell PowerConnect W-Airwave 7.2 Manual de usuario Pagina 11