Hello,
I've looked over the crush documentation but I am a little confused.
Perhaps someone here can help me out!
I have three chassis with 6 SSD osds that I use for writeback cache.
I have removed one OSD from each server and I want to make a new
replicated ruleset to use just these three OSDs. I want to segregate the
IO for the RGW bucket index on this new ruleset to isolate it from
scrubs,promotes,eviction operations.
My question is, how do I a make a ruleset that will use just these
three OSDs. My current ruleset for these hosts looks like:
root cache {
id -27 # do not change unnecessarily
# weight 3.780
alg straw
hash 0 # rjenkins1
item osd-cache01 weight 1.260
item osd-cache02 weight 1.260
item osd-cache03 weight 1.260
}
host osd-cache01 {
id -3 # do not change unnecessarily
# weight 1.260
alg straw
hash 0 # rjenkins1
item osd.15 weight 0.210
item osd.18 weight 0.210
item osd.19 weight 0.210
item osd.20 weight 0.210
item osd.21 weight 0.210
item osd.25 weight 0.210
}
host osd-cache02 {
id -4 # do not change unnecessarily
# weight 1.260
alg straw
hash 0 # rjenkins1
item osd.26 weight 0.210
item osd.27 weight 0.210
item osd.28 weight 0.210
item osd.29 weight 0.210
item osd.30 weight 0.210
item osd.31 weight 0.210
}
host osd-cache03 {
id -5 # do not change unnecessarily
# weight 1.260
alg straw
hash 0 # rjenkins1
item osd.32 weight 0.210
item osd.33 weight 0.210
item osd.34 weight 0.210
item osd.35 weight 0.210
item osd.36 weight 0.210
item osd.37 weight 0.210
}
- Daniel
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