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how_to:performance_requirements [2012/06/11 10:05] – [Disk I/O] paul | how_to:performance_requirements [2016/09/29 16:48] – [High Requirements] paul | ||
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If the Avg Disk Queue is high, but the IOPS is not too high for the disks, then the issue may be disk fragmentation. If the disk is highly fragmented, then the disk subsystem will take longer than normal to process requests, so defragmenting the disk is a good thing to try. | If the Avg Disk Queue is high, but the IOPS is not too high for the disks, then the issue may be disk fragmentation. If the disk is highly fragmented, then the disk subsystem will take longer than normal to process requests, so defragmenting the disk is a good thing to try. | ||
+ | |||
+ | **Never use RAID 5 for any database server - such as VPOP3 uses - RAID 5 will be very slow when many small updates are made, such as to database tables** | ||
=====Examples===== | =====Examples===== | ||
====Low Requirements==== | ====Low Requirements==== | ||
- | For example, | + | For example, |
* Dual core 2.4 GHz Core2Duo or better | * Dual core 2.4 GHz Core2Duo or better | ||
- | * Windows XP or Windows 7 or better | + | * Windows 7 or better |
* 4 GB RAM or more | * 4 GB RAM or more | ||
* 7200RPM SATA drives | * 7200RPM SATA drives | ||
====High Requirements==== | ====High Requirements==== | ||
- | For example, | + | For example, |
* Quad core 2.6GHz Xeon or better | * Quad core 2.6GHz Xeon or better | ||
- | * Windows | + | * Windows 2008 or 2012 R2 server |
* 8 GB RAM or more | * 8 GB RAM or more | ||
- | * Hardware RAID controller with BBWC (Battery Backed Write Cache) and 128MB or more cache RAM | + | * Hardware RAID controller with BBWC (Battery Backed Write Cache) and 512MB or more cache RAM |
* 15000 RPM SAS (Serial Attached SCSI) drives in a RAID 1 or RAID 10 configuration | * 15000 RPM SAS (Serial Attached SCSI) drives in a RAID 1 or RAID 10 configuration | ||