DuckCorp » DuckCorp Infrastructure

We are experiencing slow responses sometimes on Elwing, and it seems to affect NFS a lot.

I found high io wait lasting more than a few seconds, and sometimes several minutes long.

I looked at a bonnie++ check:

Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
Elwing           8G   347  95 25089   7 16206   3   397  22 58156   5  82.4   2
Latency               112ms   11751ms    4522ms    2791ms    9326ms   17265ms
Version  1.96       ------Sequential Create------ --------Random Create--------
Elwing              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16  5138  10 +++++ +++  6805  11 12978  25 +++++ +++  7334  12
Latency             24172us     560us     651us    1317us     105us     252us
1.96,1.96,Elwing,1,1276727105,8G,,347,95,25089,7,16206,3,397,22,58156,5,82.4,2,16,,,,,5138,10,+++++,+++,6805,11,12978,25,+++++,+++,7334,12,112ms,11751ms,4522ms,2791ms,9326ms,17265ms,24172us,560us,651us,1317us,105us,252us

And for comparison, here is the same on Annael:

Version  1.96       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
Annael           8G   682  97 73985  13 42083   5  3548  85 19836   1 271.3   4
Latency             12457us    2543ms     349ms   67604us      347s     433ms
Version  1.96       ------Sequential Create------ --------Random Create--------
Annael              -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
              files  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP  /sec %CP
                 16 15253  18 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++
Latency             11974us     623us     490us     966us     194us     113us
1.96,1.96,Annael,1,1276738616,8G,,682,97,73985,13,42083,5,3548,85,19836,1,271.3,4,16,,,,,15253,18,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,12457us,2543ms,349ms,67604us,347s,433ms,11974us,623us,490us,966us,194us,113us

HD temperatures are about 43-45°C, which is a bit high, but is the same as on Daneel, which is working fine.

I need to investigate more.