Re: any recommendation of using EnhanceIO?

[German Anders <ganders@xxxxxxxxxxxx>]

output from iostat:

CEPHOSD01:

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdc(ceph-0)       0.00     0.00    1.00  389.00     0.00    35.98   188.96    60.32  120.12   16.00  120.39   1.26  49.20
sdd(ceph-1)       0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
sdf(ceph-2)       0.00     1.00    6.00  521.00     0.02    60.72   236.05   143.10  309.75  484.00  307.74   1.90 100.00
sdg(ceph-3)       0.00     0.00   11.00  535.00     0.04    42.41   159.22   139.25  279.72  394.18  277.37   1.83 100.00
sdi(ceph-4)       0.00     1.00    4.00  560.00     0.02    54.87   199.32   125.96  187.07  562.00  184.39   1.65  93.20
sdj(ceph-5)       0.00     0.00    0.00  566.00     0.00    61.41   222.19   109.13  169.62    0.00  169.62   1.53  86.40
sdl(ceph-6)       0.00     0.00    8.00    0.00     0.09     0.00    23.00     0.12   12.00   12.00    0.00   2.50   2.00
sdm(ceph-7)       0.00     0.00    2.00  481.00     0.01    44.59   189.12   116.64  241.41  268.00  241.30   2.05  99.20
sdn(ceph-8)       0.00     0.00    1.00    0.00     0.00     0.00     8.00     0.01    8.00    8.00    0.00   8.00   0.80
fioa              0.00     0.00    0.00 1016.00     0.00    19.09    38.47     0.00    0.06    0.00    0.06   0.00   0.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdc(ceph-0)       0.00     1.00   10.00  278.00     0.04    26.07   185.69    60.82  257.97  309.60  256.12   2.83  81.60
sdd(ceph-1)       0.00     0.00    2.00    0.00     0.02     0.00    20.00     0.02   10.00   10.00    0.00  10.00   2.00
sdf(ceph-2)       0.00     1.00    6.00  579.00     0.02    54.16   189.68   142.78  246.55  328.67  245.70   1.71 100.00
sdg(ceph-3)       0.00     0.00   10.00   75.00     0.05     5.32   129.41     4.94  185.08   11.20  208.27   4.05  34.40
sdi(ceph-4)       0.00     0.00   19.00  147.00     0.09    12.61   156.63    17.88  230.89  114.32  245.96   3.37  56.00
sdj(ceph-5)       0.00     1.00    2.00  629.00     0.01    43.66   141.72   143.00  223.35  426.00  222.71   1.58 100.00
sdl(ceph-6)       0.00     0.00   10.00    0.00     0.04     0.00     8.00     0.16   18.40   18.40    0.00   5.60   5.60
sdm(ceph-7)       0.00     0.00   11.00    4.00     0.05     0.01     8.00     0.48   35.20   25.82   61.00  14.13  21.20
sdn(ceph-8)       0.00     0.00    9.00    0.00     0.07     0.00    15.11     0.07    8.00    8.00    0.00   4.89   4.40
fioa              0.00     0.00    0.00 6415.00     0.00   125.81    40.16     0.00    0.14    0.00    0.14   0.00   0.00

CEPHOSD02:

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdc1(ceph-9)      0.00     0.00   13.00    0.00     0.11     0.00    16.62     0.17   13.23   13.23    0.00   4.92   6.40
sdd1(ceph-10)     0.00     0.00   15.00    0.00     0.13     0.00    18.13     0.26   17.33   17.33    0.00   1.87   2.80
sdf1(ceph-11)     0.00     0.00   22.00  650.00     0.11    51.75   158.04   143.27  212.07  308.55  208.81   1.49 100.00
sdg1(ceph-12)     0.00     0.00   12.00  282.00     0.05    54.60   380.68    13.16  120.52  352.00  110.67   2.91  85.60
sdi1(ceph-13)     0.00     0.00    1.00    0.00     0.00     0.00     8.00     0.01    8.00    8.00    0.00   8.00   0.80
sdj1(ceph-14)     0.00     0.00   20.00    0.00     0.08     0.00     8.00     0.26   12.80   12.80    0.00   3.60   7.20
sdl1(ceph-15)     0.00     0.00    0.00    0.00     0.00     0.00     0.00     0.00    0.00    0.00    0.00   0.00   0.00
sdm1(ceph-16)     0.00     0.00   20.00  424.00     0.11    32.20   149.05    89.69  235.30  243.00  234.93   2.14  95.20
sdn1(ceph-17)     0.00     0.00    5.00  411.00     0.02    45.47   223.94    98.32  182.28 1057.60  171.63   2.40 100.00

Device:         rrqm/s   wrqm/s     r/s     w/s    rMB/s    wMB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdc1(ceph-9)      0.00     0.00   26.00  383.00     0.11    34.32   172.44    86.92  258.64  297.08  256.03   2.29  93.60
sdd1(ceph-10)     0.00     0.00    8.00   31.00     0.09     1.86   101.95     0.84  178.15   94.00  199.87   6.46  25.20
sdf1(ceph-11)     0.00     1.00    5.00  409.00     0.05    48.34   239.34    90.94  219.43  383.20  217.43   2.34  96.80
sdg1(ceph-12)     0.00     0.00    0.00  238.00     0.00     1.64    14.12    58.34  143.60    0.00  143.60   1.83  43.60
sdi1(ceph-13)     0.00     0.00   11.00    0.00     0.05     0.00    10.18     0.16   14.18   14.18    0.00   5.09   5.60
sdj1(ceph-14)     0.00     0.00    1.00    0.00     0.00     0.00     8.00     0.02   16.00   16.00    0.00  16.00   1.60
sdl1(ceph-15)     0.00     0.00    1.00    0.00     0.03     0.00    64.00     0.01   12.00   12.00    0.00  12.00   1.20
sdm1(ceph-16)     0.00     1.00    4.00  587.00     0.03    50.09   173.69   143.32  244.97  296.00  244.62   1.69 100.00
sdn1(ceph-17)     0.00     0.00    0.00  375.00     0.00    23.68   129.34    69.76  182.51    0.00  182.51   2.47  92.80

The other OSD server had pretty much the same load.

The config of the OSD's is the following:

- 2x Intel Xeon E5-2609 v2 @ 2.50GHz (4C)

- 128G RAM

- 2x 120G SSD Intel SSDSC2BB12 (RAID-1) for OS

- 2x 10GbE ADPT DP

- Journals are configured to run on RAMDISK (TMPFS), but in the first OSD serv we've the journals going on to a FusionIO (/dev/fioa) ADPT with batt.

CRUSH algorithm is the following:

# begin crush map
tunable choose_local_tries 0
tunable choose_local_fallback_tries 0
tunable choose_total_tries 50
tunable chooseleaf_descend_once 1

# 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
device 16 osd.16
device 17 osd.17
device 18 osd.18
device 19 osd.19
device 20 osd.20
device 21 osd.21
device 22 osd.22
device 23 osd.23
device 24 osd.24
device 25 osd.25
device 26 osd.26
device 27 osd.27
device 28 osd.28
device 29 osd.29
device 30 osd.30
device 31 osd.31
device 32 osd.32
device 33 osd.33
device 34 osd.34
device 35 osd.35

# types
type 0 osd
type 1 host
type 2 chassis
type 3 rack
type 4 row
type 5 pdu
type 6 pod
type 7 room
type 8 datacenter
type 9 region
type 10 root

# buckets
host cephosd03 {
    id -4        # do not change unnecessarily
    # weight 24.570
    alg straw
    hash 0    # rjenkins1
    item osd.18 weight 2.730
    item osd.19 weight 2.730
    item osd.20 weight 2.730
    item osd.21 weight 2.730
    item osd.22 weight 2.730
    item osd.23 weight 2.730
    item osd.24 weight 2.730
    item osd.25 weight 2.730
    item osd.26 weight 2.730
}
host cephosd04 {
    id -5        # do not change unnecessarily
    # weight 24.570
    alg straw
    hash 0    # rjenkins1
    item osd.27 weight 2.730
    item osd.28 weight 2.730
    item osd.29 weight 2.730
    item osd.30 weight 2.730
    item osd.31 weight 2.730
    item osd.32 weight 2.730
    item osd.33 weight 2.730
    item osd.34 weight 2.730
    item osd.35 weight 2.730
}
root default {
    id -1        # do not change unnecessarily
    # weight 49.140
    alg straw
    hash 0    # rjenkins1
    item cephosd03 weight 24.570
    item cephosd04 weight 24.570
}
host cephosd01 {
    id -2        # do not change unnecessarily
    # weight 24.570
    alg straw
    hash 0    # rjenkins1
    item osd.0 weight 2.730
    item osd.1 weight 2.730
    item osd.2 weight 2.730
    item osd.3 weight 2.730
    item osd.4 weight 2.730
    item osd.5 weight 2.730
    item osd.6 weight 2.730
    item osd.7 weight 2.730
    item osd.8 weight 2.730
}
host cephosd02 {
    id -3        # do not change unnecessarily
    # weight 24.570
    alg straw
    hash 0    # rjenkins1
    item osd.9 weight 2.730
    item osd.10 weight 2.730
    item osd.11 weight 2.730
    item osd.12 weight 2.730
    item osd.13 weight 2.730
    item osd.14 weight 2.730
    item osd.15 weight 2.730
    item osd.16 weight 2.730
    item osd.17 weight 2.730
}
root fusionio {
    id -6        # do not change unnecessarily
    # weight 49.140
    alg straw
    hash 0    # rjenkins1
    item cephosd01 weight 24.570
    item cephosd02 weight 24.570
}

# rules
rule replicated_ruleset {
    ruleset 0
    type replicated
    min_size 1
    max_size 10
    step take default
    step chooseleaf firstn 0 type host
    step emit
}
rule fusionio_ruleset {
    ruleset 1
    type replicated
    min_size 0
    max_size 10
    step take fusionio
    step chooseleaf firstn 1 type host
    step emit
    step take default
    step chooseleaf firstn -1 type host
    step emit
}

# end crush map

German

2015-07-02 8:15 GMT-03:00 Lionel Bouton <lionel+ceph@xxxxxxxxxxx>:

On 07/02/15 12:48, German Anders wrote:
> The idea is to cache rbd at a host level. Also could be possible to
> cache at the osd level. We have high iowait and we need to lower it a
> bit, since we are getting the max from our sas disks 100-110 iops per
> disk (3TB osd's), any advice? Flashcache?

It's hard to suggest anything without knowing more about your setup. Are
your I/O mostly reads or writes? Reads: can you add enough RAM on your
guests or on your OSD to cache your working set? Writes: do you use SSD
for journals already?

Lionel

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