On Wed, Mar 03, 2021 at 05:40:39PM -0500, Dan Ritter wrote: > Felix Miata wrote: > > Andrei POPESCU composed on 2021-03-03 17:50 (UTC+0200): > > > > > Felix Miata wrote: > > [...] Do > > you know of, or can you provide a reference to, any way RAID1 performance can be > > better than single disk? > > Sure. > > https://calomel.org/zfs_raid_speed_capacity.html > > First two lines of the first table of results: > > 1x 4TB, single drive, 3.7 TB, w=108MB/s , rw=50MB/s , r=204MB/s > 2x 4TB, mirror (raid1), 3.7 TB, w=106MB/s , rw=50MB/s , r=488MB/s > > Which is as theory predicts: slight reduction in write > performance (write being dominated by disk cache -> disk, not > system -> disk cache), and approximate doubling in read > performance. Thanks. Real data :) The doubling in read throughput is somewhat surprising to me. Some learning to do, it seems. Cheers - t
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