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IDS Forum

Re: IDS 11 on a RedHat VM

Posted By: Keith Simmons
Date: Monday, 7 July 2014, at 4:29 a.m.

In Response To: Re: IDS 11 on a RedHat VM (Art Kagel)

Art

Many thanks for your insight on this. One further question, if we get some
bare metal the disk will still come from a SAN, is it best to still allow
this to be presented as a single 1 Tb disk or as mutiple, smaller disks
(I've still inclined towards 10 x 100 Gb).

Keith

On 4 July 2014 19:29, Art Kagel <art.kagel@gmail.com> wrote:

> Keith, this is EXACTLY the behavior I would expect from a VM, especially an
> ESX 4 VM. I did extensive testing for a client several years ago on the
> same systems and not only is the IO throughput fixed on a single VM no
> matter how many threads are writing to/reading from the disk(s) but on a
> HUGE machine running multiple VMs gets you the same total throughput across
> all VMs with the average total throughput about the same as the rated
> throughput of a single 10K spindle and I was testing against RAID10 arrays
> with ten 10K drive pairs.
>
> Reports from the client since those test indicate that after working with
> VMWare and EMC^2 for over a year are that if you run the VMs over the
> vSphere Hypervisor the IO throughput about doubles but is still nailed to a
> ceiling.
>
> My recommendation has always been and continues to be that you run
> Informix, and all databases, on an OS that is running on bare metal.
>
> Art
>
> Art S. Kagel, Principal Consultant
> ASK Database Management
>
> Blog: http://informix-myview.blogspot.com/
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and do not reflect on the IIUG, nor any other organization with which I am
> associated either explicitly, implicitly, or by inference. Neither do
> those opinions reflect those of other individuals affiliated with any
> entity with which I am affiliated nor those of the entities themselves.
>
> On Fri, Jul 4, 2014 at 12:24 PM, Keith Simmons <smiley73@gmail.com> wrote:
>
> > Hi all
> >
> > We are currently in the process of migrating an 850 (ish) Gb database
> from
> > AIX 5/IDS9.4 to a vm server (ESX 4) running Red hat
> > 2.6.32-431.3.1.el6.x86_64/IDS 11.70.FC7.
> > New server has the same numbers of CPUs, identical memory and the same
> > amount of disk.
> >
> > Shifting the data across from the existing machine to new one is being
> doen
> > by multiple streams of 'UNLOAD TO `pipe` SELECT * FROM' combined with
> > 'DBLOAD', plus a single stream of ' SELECT * FROM INSERT INTO' for 300
> > smaller tables (there are around 30 large tables in 6 unload streams).
> >
> > Source and target machines are in the same subnet and have 1Gb end to end
> > network plus the data source is an HDR secondary which is NOT used for
> any
> > other purpose (such as read-only queries).
> >
> > Basically the load performance sucks on anything more than a single
> stream
> > and when we have managed a full load, initial testing of the application
> > returns abysmal performance.
> >
> > The disks on the source are not stressed in any way (around 25%
> > utilisation) but the disks on the new server are constantly at 100% but
> can
> > only seem to shift some 10 Mb/s.
> >
> > The main structural difference between the machines seems to be how the
> > disk is presented and I am trying to find out what is considered 'best
> > practise' or how to get some decent performance. The existing server has
> > direct attached (2Gb fibre, redundant path) storage presenting as 27 x
> 36Gb
> > disks which are then carved up by AIX LVM into 4 and 8 Gb chunks and
> > assigned to dbspaces. On the new server there is 1 Tb of SAN disk
> presented
> > through a parascsi adapter to the server as a single disk (/dev/sde)
> which
> > is then carved up by the RedHat LVM. When loading the data, no matter how
> > many streams run or how many chunks are being hit, the overall thoughput
> > seems to be topping out at 10 Mb/sec.
> >
> > I suppose my queston is, is this the best way of presenting this amount
> of
> > disk or would it be better to get 10 x 100Gb disks, treat them as
> separate
> > spindles and divide the data/indexing between them as I would do on
> > tranditionally attached disk. Any thoughts, comments, suggestions
> > gratefully received.
> >
> > Keith
> >
> > ps I only have limited, view accessto the VM environment as it is managed
> > for us but I do hve full root access to the RedHat environment, I have no
> > visibility on the SAN.
> >
> > --089e0115f5183fa01f04fd608efb
> >
> >
> >
> >
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --001a1133a628e0faad04fd624c94
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

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