[progress Communities] [progress Openedge Abl] Forum Post: Re: Raid 1 Recommendations

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gus bjorklund

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RAID 0 is disk striping. that improves performance by equalizing the i/o load over the members of the stripe set. but RAID 0 has NO REDUNDANCY. If one disk in the stripe set fails, you lose everything with no chance of recovery. Therefore it should not be used by itself - it should be combined with RAID 1 (mirroring) to give you RAID 10. For RAID 10, you set up a number of mirrored disk paris and then stripe the pairs. this way, as long as you don’t lose both sides of the same pair, you can tolerate multiple disk failures. Also, you get improved read throughput with mirrors as the system can read from both sides of the pairs simultaneously. Writes of course require updating both sides at the same time. If you do RAID 1 by itself, you get redundancy without striping but then you have to manually lay out what goes on each volume. That is hard to do and will most likely result in some volumes being idle and one or more being maxed out. The Dell R730 is a good machine and you have plenty of RAM. I would use 6 disks in a RAID 10 setup with the databases, bi logs, and temp files there, 1 for the operating system and software, and 1 for after-imaging.

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