Re: [CentOS] Re: A question about RAID and partitions

Miguel Medalha wrote:

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have raid 0 and raid1 on the same drive isn't going to gie you anything since the raid 1 will "slow" the other raids down.

You are assuming that both arrays will always be concurrently accessed but that may not be the case. More yet: the configuration may have been studied in such a way that concurrent access is rarely the case.

If you only have 2 drives there's not much you can do to avoid concurrent access. The killer is head seek time - if you have your only 2 drives tied together in any kind of raid and the head needs to be in 2 places at once it doesn't matter much how you laid out the partitions. Reads can be sort-of independent on raid1 but writes make both seek to the same place.