Does geom_raid1e support raid10e?
Eduardo Morras
emorrasg at yahoo.es
Wed Jul 17 08:22:08 UTC 2013
Hello, I want to know if geom_raid1e support raid10e level too. The difference between them is that 1e duplicates the 32-64-128-whatever block data size in all n disks in the raid1e but raid10e only between n/2 and n (a try to show it below), making raid10e bigger and more flexible than plains raid1/raid1e or raid10 respectively.
In raid1e:
Disk D1 D2 D3 D4 D5
Block a1 a1 a1 a1 a1
Block a2 a2 a2 a2 a2
Block a3 a3 a3 a3 a3
In raid10e:
Disk D1 D2 D3 D4 D5
Block a1 a1 a1 a2 a2
Block a2 a3 a3 a3 a4
Block a4 a4 a5 a5 a5
In these examples, with block size of 128KB, raid1e will survive to fail of 4 disks and stores 128*3 = 384 KB; raid10e will survive to fail of 2 disks and stores 128*5 = 640 KB.
In some literature, raid10e duplicates between 2 and n disks.
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Eduardo Morras <emorrasg at yahoo.es>
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