placing SSDs and SATAs pool in same hosts

[zorg <zorg@xxxxxxxxxxxx>]

Hi,
After reading the thread
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2013-June/002358.html

We have done this crush map to make thing work.
srv1 and srv1ssd are the same physical server (same srv2,3,4)
we split it in the crush to make two parallel hierarchies.
This example is working,
I was just wondering if it's  the best way to achieve this

Thanks


# begin crush map

# devices
device 0 osd.0
device 1 osd.1
device 2 osd.2
device 3 osd.3
device 4 osd.4
device 5 osd.5
device 6 osd.6
device 7 osd.7
device 8 osd.8
device 9 osd.9
device 10 osd.10
device 11 osd.11
device 12 osd.12
device 13 osd.13
device 14 osd.14
device 15 osd.15

# types
type 0 osd
type 1 host
type 2 rack
type 3 row
type 4 room
type 5 datacenter
type 6 root

# buckets
host srv1 {
    id -2        # do not change unnecessarily
    # weight 5.690
    alg straw
    hash 0    # rjenkins1
    item osd.1 weight 1.820
    item osd.2 weight 1.820
    item osd.3 weight 1.820
}
host srv2 {
    id -3        # do not change unnecessarily
    # weight 5.690
    alg straw
    hash 0    # rjenkins1
    item osd.5 weight 1.820
    item osd.14 weight 1.820
    item osd.15 weight 1.820
}
host srv3 {
    id -4        # do not change unnecessarily
    # weight 5.690
    alg straw
    hash 0    # rjenkins1
    item osd.7 weight 1.820
    item osd.8 weight 1.820
    item osd.9 weight 1.820
}
host srv4 {
    id -5        # do not change unnecessarily
    # weight 5.690
    alg straw
    hash 0    # rjenkins1
    item osd.11 weight 1.820
    item osd.12 weight 1.820
    item osd.13 weight 1.820
}
host srv1ssd {
    id -100
    alg straw
    hash 0
    item osd.0 weight 0.230
}
host srv2ssd {
    id -101
    alg straw
    hash 0
    item osd.4 weight 0.230
}
host srv3ssd {
    id -102
    alg straw
    hash 0
    item osd.6 weight 0.230
}
host srv4ssd {
    id -103
    alg straw
    hash 0
    item osd.10 weight 0.230
}

root default {
    id -1        # do not change unnecessarily
    # weight 22.760
    alg straw
    hash 0    # rjenkins1
    item srv1 weight 5.690
    item srv2 weight 5.690
    item srv3 weight 5.690
    item srv4 weight 5.690
}

root ssd {
    id -99
    alg straw
    hash 0
    item srv1ssd weight 0.230
    item srv2ssd weight 0.230
    item srv3ssd weight 0.230
    item srv4ssd weight 0.230
}


# rules
rule data {
    ruleset 0
    type replicated
    min_size 1
    max_size 10
    step take default
    step chooseleaf firstn 0 type host
    step emit
}
rule metadata {
    ruleset 1
    type replicated
    min_size 1
    max_size 10
    step take default
    step chooseleaf firstn 0 type host
    step emit
}
rule sata {
    ruleset 2
    type replicated
    min_size 1
    max_size 10
    step take default
    step chooseleaf firstn 0 type host
    step emit
}
rule ssd {
    ruleset 3
    type replicated
    min_size 1
    max_size 10
    step take ssd
    step chooseleaf firstn 0 type host
    step emit
}

# end crush map

cyril

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probeSys - spécialiste GNU/Linux
site web : http://www.probesys.com

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