dm-mirror (i.e. "lvcreate --type mirror" or respective "dmsetup create
--table ...",
which is not the recommended raid1 layout any more) provides read
round-robin since long time.
You'd need an ancient kernel not to have it supported.
"raid1"/"raid10" (the recommended targets) , i.e. the md-raid based
mappings accessible via the dm-raid target
do read optimizations as well. Use "lvcreate --type raid1/raid10 ..." or
a respective dm table to set
those up. The former ("raid1") is the default in modern distributions
and configurable via setting
'mirror_segtype_default = "raid1"' in /etc/lvm/lvm.conf.
Heinz
On 02/19/2015 08:23 AM, konstantin wrote:
What version of the kernel should I use to get a round-robin read
implementation on LV raid1?
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