Hi!
Two questions.
1-st. As I understand it - any usable changes of CRUSH map on active
cluster can't destruct data? In the worst case (for example, I managed
to put two osd in one rack, and now I have two copies of the data in a
single rack) I get information about the degradation and this will be
fixed automatically?
2-nd. How to correct edit crush map in case "rack"?
Let's say I have such a map:
device 0 device0
device 1 device1
device 2 device2
device 3 device3
device 4 device4
# types
type 0 device
type 1 host
type 2 rack
type 3 root
# buckets
host host0 {
id -1
alg straw
hash 0 # rjenkins1
item device0 weight 1.000
}
...
host host4 {
id -5
alg straw
hash 0 # rjenkins1
item device4 weight 1.000
}
rack rack0 {
id -6
alg straw
hash 0 # rjenkins1
item host0 weight 1.000
}
...
rack rack4 {
id -10 # do not change unnecessarily
alg straw
hash 0 # rjenkins1
item host4 weight 1.000
}
root root {
id -11 # do not change unnecessarily
alg straw
hash 0 # rjenkins1
item rack0 weight 1.000
item rack1 weight 1.000
item rack2 weight 1.000
item rack3 weight 1.000
item rack4 weight 1.000
}
# rules
rule data {
ruleset 1
type replicated
min_size 2
max_size 2
step take root
step chooseleaf firstn 0 type host
step emit
}
And now i want add one "rack" and add one "osd" to this rack. How should
I deal with "id"?
WBR,
Fyodor.
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