Cashe speed in Raid 1 vs. Raid 10.


frodr

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What are you comparing? 4 SSDs in btrfs RAID1 vs 4 SSDs in btrfs RAID 10? I wouldn't expect there to be a huge difference because btrfs is intelligent. RAID 10 guarantees that block n is mirrored across two devices and that block n + 1 is mirrored across two different devices. RAID 1 simply guarantees that each block is mirrored across two devices, but when it has four devices to play with it can be quite creative. Though not guaranteed, there's little reason for adjacent blocks not to be written to different devices where possible, so RAID 10-like performance is not unexpected. You can even have configurations that just wouldn't work with conventional RAID, such as a five-device RAID 10, and they don't even all have to be the same capacity!

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