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I am about to move our RAID 1 implementation to RAID 5 to increase performance. I'm trying to decide whether to make all disks part of the RAID 5 to include the system and KMS all together or to separate them. I have 4 hard disks all the same. I'm thinking of the following:

1) Just make a 4 disk RAID 5 and have the system and KMS all on it.
2) 1 disk for System and "KMS log directory" and the rest of KMS on a 3 disk RAID 5. The logs will have a lot of writes which is RAID 5's downfall. This scenario might increase performance, but if the drive with the system fails, that won't be good. Although, I do thorough backups.

My overall goal is to improve performance. Current configuration:

RAID 1 (2 disks)
Redhat Linux 3
KMS 6.0.3

I've bought 2 more disks exactly like my current two. So, now I have 4 disks that are the same.

Anyone got any suggestions for increasing performance and finding the best way to implement?


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RAID5 is better at write performance over RAID3. In RAID3, the dedicated parity drive gets hit on every write, in RAID5 this is distributed.

For best performance while maintaining redundancy (although more expensive), use hardware RAID10. This would be 2 x 3 RAID0 disks (total 6) that are mirrored. Most of the LSI RAID controllers now support a hot spare option, so a failed drive is automatically substituted when one fails.

Really depends on how much money you want to throw at it. I would use RAID1 for system disks, or if the budget doesn't allow, ghost it and have a hot spare. Keep your data stores and logs on the RAID10 drives.
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