how_to:performance_requirements
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| how_to:performance_requirements [2012/06/11 10:05] – [Disk I/O] paul | how_to:performance_requirements [2015/09/23 13:46] – external edit 127.0.0.1 | ||
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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===== | ||
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| * Windows 2003 or 2008 R2 server | * Windows 2003 or 2008 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 | ||
how_to/performance_requirements.txt · Last modified: 2018/11/14 10:45 by 127.0.0.1
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