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> They are all different questions: |
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> |
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> * Hardware RAID vs Software RAID |
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> Hardware RAID offers more performance and often more sophisticated RAID |
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> features. |
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> Basically you're offloading the work for the RAID setup to an external |
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> piece of hardware (the controller) instead of your own server. |
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> Depending on how much performance you need it's well worth the money. |
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> Another advantage is that Hardware RAID controllers often offer you the |
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> opportunity to extend your RAID array beyond the usual 4 SATA |
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> interfaces. Depends on the card though. |
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This is not necessarily the case, typically if you are CPU bound then |
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the above statement is true. If you are IO bound, then software raid |
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offers, overall, better throughput to the disk and allows for more |
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flexibility. |
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Back in the day... we were running the LSI MegaRAID controllers with |
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RAID 1 on 9gig SCSI disks, we were choking our application |
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(mysql/mod_perl) we took the MegaRAID controller out and performance |
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increased by about 25%. (note: this is a real world situation) |
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