Hi
i am new and was redirected to this list from the bugtracker
please have a look at https://bugzilla.kernel.org/show_bug.cgi?id=194551
currently "writemostly" seems to be only supported on "real" RAID1 while
i was in hope that by the conecpt of RAID10 having more or less
RAID0+RAID1 it would also work on RAID10 (and on the virtual machine wre
i tested mdadm with the flag before buying the disks it did not complain)
RAID10 with "writemostly" makes a lot of sense for large storages to get
them fast *and* reliable without make it extremly expensive
* you don't want RAID5/RAID6 rebuild over many TB
* very large SSD for RAID1 are much more expensive than smaller ones
so with 4x2 TB disks you get 4 TB useable storage and with "writemostly"
which would be in the best case "writeonly" you have a lightening fast
RAID0 on SSD with good redundancy
most workloads are read-intense with less writes (rsync with --checksum
enabled, booting, starting large applications...)
another benefit: different technologies - it's very unlikely that both
disks of a stripe fail at the same time or due rebuild when one half is
a SSD and the other a HDD
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