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IDS Forum

Re: IDS 11 on a RedHat VM

Posted By: Keith Simmons
Date: Monday, 7 July 2014, at 3:52 a.m.

In Response To: Re: IDS 11 on a RedHat VM (JON RITSON)

Jon
Thanks.
dd showed similar behaviour (but not quite so extreme and was not really
conclusive) and curiously writes were much quicker than reads (to
/dev/null).

There are 150 logical volumes, mixture of 6 and 8 Gb with 1 to 5 lvs per
dbspace. KAIO is in use. The block device is presented to informix. 4 CPU
VPs

Keith

On 5 July 2014 17:51, JON RITSON <jonritson@sky.com> wrote:

> Hi,
>
> Firstly, I would defer to Art as the information he has provided appears
> to be
> based on a lot of actual "real world" experience which is the only way to
> get
> a true understanding ... positive affirmation.
>
> Secondly, have you done some actual trials completely outside of IBM
> Informix??
>
> For example, doing dd N.B DESTRUCTIVE TESTING!!!!!!
>
> 1 single stream of ...
>
> time dd if=/dev/zero bs=2k|4k|8k|16k of="chunk path count="at least 1 Gig
> of
> BS"
>
> (BS = Block Size not ... :O )
>
> Then 2 streams of dd and then 4 etc. etc.
>
> Thirdly, you mention "a single 1TB /dev/sde, then carved up using LVM" ...
> how many lvms?
> what size of lvms?
> presenting the raw lvm to informix or the block device or a file?
> KAIO? how may CPU VPs? DIRECT_IO enabled?
>
> Now this testing may just confirm the limits you have seen, or you may see
> different behavior ...
>
> Just a quick reply on a Saturday :)
>
> JJ
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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