Hi Fyodor,
The problem is your rules:
On Sun, 29 May 2011, Fyodor Ustinov wrote:
> # rules
> rule data {
> ruleset 0
> type replicated
> min_size 1
> max_size 10
> step take root
> step choose firstn 0 type rack
This is giving you N _racks_. You probably want
step chooseleaf firstn 0 type rack
which will give you N devices from distinct racks.
BTW, you can verify that the map is behaving with something like
$ crushtool -i crushfile --test
devices weights (hex):
[10000,10000,10000,10000,10000,10000,10000,10000,10000,10000,10000]
rule 0 (data), x = 0..9999
device 0: 2391
device 1: 2446
device 2: 2338
device 3: 2332
device 4: 2360
device 5: 2450
device 6: 0
device 7: 1368
device 8: 1460
device 9: 1446
device 10: 1409
num results 2: 10000
rule 1 (metadata), x = 0..9999
device 0: 2391
device 1: 2446
device 2: 2338
device 3: 2332
device 4: 2360
device 5: 2450
device 6: 0
device 7: 1368
device 8: 1460
device 9: 1446
device 10: 1409
num results 2: 10000
rule 2 (rbd), x = 0..9999
device 0: 2391
device 1: 2446
device 2: 2338
device 3: 2332
device 4: 2360
device 5: 2450
device 6: 0
device 7: 1368
device 8: 1460
device 9: 1446
device 10: 1409
num results 2: 10000
(That's with 'choose' changed to 'chooseleaf'. Your current map gives 0
objects on every device.)
Cheers-
sage
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