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True about RAID6, I was just commenting on performance. A 2TB will spank an 8TB in any configuration.

I would think that GitLab's workload is mostly random, which would pose a problem for larger drives. The SSDs are a great idea, but I've only seen 8TB drives used when there are 2 to 3 tiers; with 8TB drives being all the way on the bottom. I'm not sure how effective having a single SSD as a cache drive for 24TBs of 8TB disks will be.

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