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Distribution: Gentoo Hardened using OpenRC not Systemd
Posts: 1,495
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Performance for raid
What would be a better idea? I've got two drives in raid 1 right now. I'd like to add a third drive, so I can have a performance boost. Would 2x drives in raid 0 and a third one not in raid for cron backups of /home copied to the the third drive or all 3 drives in raid 5? Also has anyone seen a good chart showing performance comparisons of the different raid types for example, a chart showing the performance speed of raid 0, 5, and 10 for easy comparison?
You will probably want to search on google for benchmarks. For raid 5, you may have a performance boost for reads, but writes will be slower.
Whether you use a raid controller or software raid would also be a factor. Most controllers are fake raid and will involve the cpu to calculate the parity. 3ware and maybe adaptec raid controllers are true raid controllers. NAS servers might have a raid cache card installed as will with battery backup.
Be warned that going for the fastest drives, the constant acceleration of the heads consume a lot of power. One person posting on this site had a dual opteron desktop with a raid 5 subsystem populated with rapter drives. He doesn't need to turn up the thermostat for his apartment in the winter, and doesn't run it in the summer because his cooling bill would be too large if he did.
I'm afraid that the bad news is that, at least in 'commodity' hardware, on this testing, above a certain level, the speed of the raid levels shows little sign of conforming to what you might think; my suspicion is that limited pci bandwidth is a serious factor here, but maybe that will be confirmed if the series progresses further.
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