Server RAID, NAS and SAN Information
Under RAID Server
RAID Server
RAID and other enterprise server environments have a high degree of fault tolerance however even the most well designed systems are susceptible to malfunctions and RAID systems can hardly be an exception to this rule. There’s a litany of reasons that can cause a RAID system failure. Sometimes power fluctuation, software, hardware problems (disk controller malfunctions) or even human error.
Unfortunately when a business RAID, NAS or SANs storage server system first fails, it can be the first sings an unfolding catastrophe. The damage and losses caused by such failures are not only disruptive to productivity, but the down time and outage can also often have astronomical financial consequences if not quickly remedied.
Commonly used Server RAID Configurations:
Following are RAID server makes and types, including the most widely used RAID 0, RAID 1 and RAID 5 configurations.
| RAID 0 |
| RAID O uses what is called a data striping technique. Multiple hard drives are combined into one large volume. Because it splits the data and accesses both drives in parallel, RAID O reads and writes faster than a non-RAID configuration. RAID 0 doesn’t offer data redundancy and requires a minimum of two hard drives to be totally restored as a requirement for completing a successful RAID recovery. |
| RAID 1 |
| RAID 1 mirrors, or copies the content of one drive onto another twin drive. If one of your drives should fail, mirroring guarantees optimal data integrity and instant access to your data. Another advantage of RAID 1 is that it allows you to use just 50 percent of your NAS device’s available capacity. A requirement for RAID 1 is a minimum of two hard drives and when using more they must be even numbers. The advantage of this type of RAID configuration is that recovery takes less time, resources and tools – assuming that the mirrors functioning correctly when the failure occurred. |
| RAID 5 |
| RAID 5 offers the best mix of data backup, capacity and performance. Although RAID 5 does stripe all available drives into a single large volume, space equal to one of its hard drives is used to store parity data. If correctly configured, when one hard drive fails, it will use the parity data to rebuild your data. RAID needs a minimum of 3 hard drives. Another backup option RAID 5 offers is hot spare. This reserves an additional hard drive that takes over immediately if another drive fails. Total RAID capacity is calculated by subtracting the space of two drives from the sum of all the hard drives. If you want to use hot spare with RAID 5, you must have a minimum of 4 hard drives. |
All Disk Based RAID Array Configurations:
We address the most common RAID configurations mentioned above, but following are more obscure types available to you as well.
| Server RAID Configurations: | |||
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| Common RAID Failures Include: | |
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| RAID Hard Drive Types: | |||
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All Server OEM Makes and Models:
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All ProLiant Series | Full RAID Support |
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All PowerEdge Series | Full RAID Support |
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Full RAID Support |
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IBM XSeries, Unix AIX, PSeries | Full RAID Support |
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Entire line of product | Full RAID Support |
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All Intel, AMD + More | Full RAID Support |
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Entire RAID Product line | Full RAID Support |
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