yeah 3TB SAS disks
*German Anders*
Storage System Engineer Leader
*Despegar* | IT Team
*office* +54 11 4894 3500 x3408
*mobile* +54 911 3493 7262
*mail* gand...@despegar.com
2015-07-02 9:04 GMT-03:00 Jan Schermer <j...@schermer.cz>:
> And those disks are spindles?
> Looks like there’s simply too few of there….
>
> Jan
>
> On 02 Jul 2015, at 13:49, German Anders <gand...@despegar.com> wrote:
>
> 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+c...@bouton.name>:
>
>> 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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