hi Hans!
well, this was discussed some times here, and i tested something like it
well if you want more secure disk, use raid 1,5,6
if you want speed use cache (bcache, flashcache, dm cache)

the write behind will not give a lot of speed, i think that a raid1
with hdd + ssd as cache is better, but didn't tested yet, i have a
revodrive here, and it have two devices (sda/sdb) this could allow a
raid1-hdd raid1-ssd and give secure at cache side...

maybe others guves have more ideas here...

Sans told me to buy a raid hardware with cache and bbu, it's better
than a raid1 + sdd as cache, i didn't cehcked yet... but probably i
will do

2013/9/28 Hans Kraus [off-list ref]:

Am 28.09.2013 17:28, schrieb Roberto Spadim:

quoted

what hybrid means?
[...]

An SSD and a conventional HD as mdadm Raid 1, the conventional HD
added with '--write-behind --write-mostly' during the mdadm create.

Regards, Hans

(Sorry, forgot the list during my first reply)


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