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тАО09-29-2003 08:13 PM
тАО09-29-2003 08:13 PM
Low performance EVA 3000
Our environment is:
EVA3000 with 8 disks (72,8 GB) with one group disk and two virtual disks (80 GB RAID-1 and 300 GB RAID-5).
Connected to the EVA is a ProLiant DL580, with Windows 2000 Advanced Server SP3 and SQL Server 2000 SP3a. The transaction logs are located in the 80GB virtual disk, and the database files are in the 300GB vd.
We are comparing the performance with other server (ML750 with internal SCSI disks) and the results are DL580 much better than ML750 (more than 40% faster) while SQL is reading. But, when SQL is writing, the old machine is about 20% faster than the new one.
We have also copied files from one virtual disk to the other and got 10 MB/sec.
Any idea? Is there a way to improve writing operations in EVA3000 (for example, increasing buffers)? We have activated by default caching in writing and reading operations. Should we deactivate the read cache?
Thanks in advance.
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тАО09-30-2003 01:39 PM
тАО09-30-2003 01:39 PM
Re: Low performance EVA 3000
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тАО03-09-2005 10:15 PM
тАО03-09-2005 10:15 PM
Re: Low performance EVA 3000
Windows applications that use EVA "Vraid" Virtual Disks for data stores may experience a write performance issue if partitions are not properly aligned. Performance data shows the impact to some applications may be significant. Data shows a greater impact is experienced on Vraid5 units than on Vraid1 units. Applications with multiple sequential write streams are more impacted than random write loads. The Windows DISKPAR utility will allow creating a disk partition that is properly aligned.
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тАО03-10-2005 12:50 AM
тАО03-10-2005 12:50 AM
Re: Low performance EVA 3000
Regards,
David Tapper
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тАО08-18-2009 07:11 AM
тАО08-18-2009 07:11 AM