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IDS Forum

Re: How to avoid blocking checkpoints?

Posted By: david@smooth1.co.uk
Date: Monday, 15 May 2017, at 5:47 p.m.

In Response To: Re: How to avoid blocking checkpoints? (GUSTAVO ECHENIQUE)

Hi,

Where is the rest of onstat -D? We need to see writes per chunk.

Also can you send onstat -g ioq?

I would increase CLEANERS to 32 and check again.

This looks that there is only 1 dbspace for data/index/blobs is that correct?

Could it be that all dirty pages at the time the checkpoint starts are all in the same chunk?

That would explain the large checkpoint times.

Also go into Windows Performance Monitor and enable the following counters

Physical Disk -> Avg. Disk sec/Read
Physical Disk -> Avg. Disk sec/Transfer
Physical Disk -> Avg. Disk sec/Write
Physical Disk -> Avg. Disk Write Queue Length

and check what you get during checkpoints.

Regards,
David.

> On 15 May 2017 at 22:30 GUSTAVO ECHENIQUE <gustavo.echenique@cemdo.com.ar> wrote:
>
>
> Hi Art!
>
> I send you the copy of the commands that you requested.
>
> C:\Informix>onstat -g iov
>
> Informix Dynamic Server Version 7.31.TD6 -- On-Line -- Up 05:20:41 -- 1379136
> Kbytes
>
> AIO I/O vps:
> class/vp s io/s totalops dskread dskwrite dskcopy wakeups io/wup errors
> kio 0 s 54.2 1041585 125284 916301 0 205791447 0.0 0
> kio 1 i 61.3 1177393 239878 937515 0 3581357382 -0.0 0
> kio 2 i 67.3 1294468 329623 964845 0 468431746 0.0 0
> kio 3 i 69.8 1340824 373310 967514 0 736248903 0.0 0
> kio 4 i 331.2 6366742 5332708 1034034 0 3516245753 -0.0 0
> kio 5 i 78.6 1510065 357187 1152878 0 595532308 0.0 0
> kio 6 i 61.5 1181848 263363 918485 0 459739069 0.0 0
> msc 0 i 0.0 27 0 0 0 28 1.0 0
> aio 0 i 0.0 332 64 0 0 333 1.0 0
> pio 0 i 0.0 0 0 0 0 1 0.0 0
> lio 0 i 0.0 0 0 0 0 1 0.0 0
>
> C:\Informix>onstat -F
>
> Informix Dynamic Server Version 7.31.TD6 -- On-Line -- Up 05:37:59 -- 1379136
> Kbytes
>
> Fg Writes LRU Writes Chunk Writes
> 82305 6231910 2447839
>
> address flusher state data
> 58320510 0 L 179 = 0Xb3
> 58320a08 1 L 243 = 0Xf3
> 58320f00 2 L 71 = 0X47
> 583213f8 3 L 45 = 0X2d
> 583218f0 4 L 173 = 0Xad
> 58321de8 5 L 121 = 0X79
> 583222e0 6 L 247 = 0Xf7
>
> states: Exit Idle Chunk Lru
>
> C:\Informix>onstat -D
>
> Informix Dynamic Server Version 7.31.TD6 -- On-Line -- Up 05:39:09 -- 1379136
> Kbytes
>
> Dbspaces
> address number flags fchunk nchunks flags owner name
> 5831e150 1 1 1 1 N informix rootdbs
> 586e7568 2 2001 2 1 N T informix tmp0
> 586e7628 3 2001 3 1 N T informix tmp1
> 586e76e8 4 2001 4 1 N T informix tmp2
> 586e77a8 5 2001 5 1 N T informix tmp3
> 586e7868 6 2001 6 1 N T informix tmp4
> 586e7928 7 2001 7 1 N T informix tmp5
> 586e79e8 8 2001 8 1 N T informix tmp6
> 586e7aa8 9 2001 9 1 N T informix tmp7
> 586e7b68 10 2001 10 1 N T informix tmp8
> 586e7c28 11 2001 11 1 N T informix tmp9
> 586e7ce8 12 2001 12 1 N T informix tmp10
> 586e7da8 13 2001 13 1 N T informix tmp11
> 586e7e68 14 2001 14 1 N T informix tmp12
> 586e7f28 15 2001 15 1 N T informix tmp13
> 586ea018 16 2001 16 1 N T informix tmp14
> 586ea0d8 17 2001 17 1 N T informix tmp15
> 586ea198 18 2001 18 1 N T informix tmp16
> 586ea258 19 2001 19 1 N T informix tmp17
> 586ea318 20 2001 20 1 N T informix tmp18
> 586ea3d8 21 2001 21 1 N T informix tmp19
> 586ea498 22 2001 22 1 N T informix tmp20
> 586ea558 23 2001 23 1 N T informix tmp21
> 586ea618 24 2001 24 1 N T informix tmp22
> 586ea6d8 25 2001 25 1 N T informix tmp23
> 586ea798 26 2001 26 1 N T informix tmp24
> 586ea858 27 2001 27 1 N T informix tmp25
> 586ea918 28 2001 28 1 N T informix tmp26
> 586ea9d8 29 2001 29 1 N T informix tmp27
> 586eaa98 30 2001 30 1 N T informix tmp28
> 586eab58 31 2001 31 1 N T informix tmp29
> 586eac18 32 1 32 1 N informix logdbs
> 586eacd8 33 1 33 1 N informix physdbs
> 586ead98 34 1 34 129 N informix cemdo
> 34 active, 2047 maximum
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>

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