Re: Performances issues with SSD volume ?

----- Original Message -----

> From: Glyn Astill <glynastill@yahoo.co.uk>
> To: Thomas SIMON <tsimon@neteven.com>
> Cc: "pgsql-admin@postgresql.org" <pgsql-admin@postgresql.org>
> Sent: Tuesday, 26 May 2015, 16:27
> Subject: Re: [ADMIN] Performances issues with SSD volume ?
>
>>  From: Thomas SIMON <tsimon@neteven.com>
>> To: Glyn Astill <glynastill@yahoo.co.uk>
>> Cc: "pgsql-admin@postgresql.org"
> <pgsql-admin@postgresql.org>
>> Sent: Tuesday, 26 May 2015, 15:44
>> Subject: Re: [ADMIN] Performances issues with SSD volume ?
>>
>> I can't do bonnie++ now, beacause I've already prepared server as a
>> slave, and I have no sufficient disk space available (program says File
>> size should be double RAM for good results output)
>>
>> My current sar output on productions (HDD) server is:
>> 14:25:01          DEV                    tps  rd_sec/s  wr_sec/s
>> avgrq-sz  avgqu-sz     await     svctm     %util
>>
>> 11:05:01    vg_data-lv_data    954.37   2417.35  18941.77 22.38
>> 31.10     32.46      0.34     32.70
>> 11:15:01    vg_data-lv_data   1155.79   8716.91  21995.77 26.57
>> 25.15     21.74      0.40     46.70
>> 11:25:01    vg_data-lv_data   1250.62   6478.67  23450.07 23.93
>> 39.77     31.78      0.41     51.34
>> 11:35:01    vg_data-lv_data    842.48   2051.11  17120.92 22.76
>> 15.63     18.53      0.29     24.04
>> 11:45:01    vg_data-lv_data    666.21   1403.32  14174.47 23.38
>> 10.11     15.12      0.24     15.79
>> 11:55:01    vg_data-lv_data    923.51   6763.36  15337.58 23.93
>> 13.07     14.14      0.35     32.63
>> 12:05:01    vg_data-lv_data    989.86   9148.71  16252.59 25.66
>> 19.42     19.56      0.45     44.21
>> 12:15:01    vg_data-lv_data   1369.24   8631.93  24737.60 24.37
>> 35.04     25.54      0.45     61.33
>> 12:25:01    vg_data-lv_data   1776.12   7070.01  39851.34 26.42
>> 74.81     42.05      0.44     77.29
>> 12:35:01    vg_data-lv_data   1529.15   6635.80  85865.14 60.49
>> 54.11     35.34      0.48     72.89
>> 12:45:01    vg_data-lv_data   1187.43   4528.74  40366.95 37.81
>> 36.07     30.36      0.39     45.81
>> 12:55:01    vg_data-lv_data    984.48   3520.06  21539.36 25.45
>> 17.91     18.17      0.31     30.20
>> 13:05:01    vg_data-lv_data    926.54   6304.44  16688.94 24.82
>> 17.36     18.69      0.41     38.05
>> 13:15:01    vg_data-lv_data   1232.46   7199.65  29852.49 30.06
>> 40.17     32.53      0.42     51.60
>> 13:25:01    vg_data-lv_data   1223.46   3945.05  27448.15 25.66
>> 31.07     25.31      0.35     42.65
>> 13:35:01    vg_data-lv_data   1126.91   2811.70  22067.19 22.08
>> 24.33     21.55      0.32     36.00
>> 13:45:01    vg_data-lv_data    833.33   1805.26  17274.43 22.90
>> 24.40     29.25      0.30     25.41
>> 13:55:02    vg_data-lv_data   1085.88   7616.75  19140.67 24.64
>> 17.48     16.06      0.39     42.15
>> 14:05:01    vg_data-lv_data    691.52   3852.50  13125.53 24.55
>> 7.75     11.15      0.30     20.74
>> 14:15:01    vg_data-lv_data   1288.88   5390.41  24171.07 22.94
>> 33.31     25.76      0.36     46.31
>> 14:25:01    vg_data-lv_data   1592.88   3637.77  29836.89 21.02
>> 76.45     47.94      0.40     63.28
>> 14:35:01    vg_data-lv_data   1652.78   9502.87  31587.68 24.86
>> 58.97     35.58      0.44     72.46
>> 14:45:01    vg_data-lv_data   1623.82   6249.52  34148.46 24.88
>> 53.47     32.83      0.40     65.19
>> 14:55:01    vg_data-lv_data   1330.44   6516.11  26828.59 25.06
>> 55.66     41.81      0.42     55.46
>> Average:    vg_data-lv_data   1176.55   5508.02  26324.37 27.06
>> 33.86     28.72      0.39     45.59
>
>
> So the i/o is read heavy, it would be interesting to see why that might be and
> some insight into running queries would go a long way there.
>

>


Scratch that, I've obviously misaligned the output when reading it and I was looking at writes when I thought I was
lookingat reads.  Still would be nice to see what the reads are though.