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Migration plans

Posted by Michael Stahlberg 
Michael Stahlberg
Migration plans
April 16, 2019 02:59AM
HI all,

after long working with ADSM/TSM and migrating from Solaris to AIX about
9 years ago, we are now asked to refresh our hardware again. It came out
that our old backup server are the only AIX server we still have and we
should thinking about migrating to linux. I'm not real happy about it,
but I think that it will work. I have some more doubts about the
hardware we should use. I know that we should have a lot of disks for
the database, but our databases aren't very big (the biggest is about
400 GByte) and to get small disks is difficult. At the moment we have an
AIX server with an external storage (DS3500) with a lot of disks. The
plans are to migrate to a HP DL380 system with internal disks. The
database should be on SSDs so we are not sure if we still should use a
lot of disks, or if it makes sense to use only 2 or 4 disks mirrored
with a spare disk, or if it might be useful to use Raid5. Has anybody
experiences with it, please. The documentation I found about this is in
my eyes not up to date and so I'm asking this group now, for their
experiences about this.
It will be also fine, if somebody did such a migration already. I read
about export and import the database from AIX to Linux. Has somebody do
this, please. How did it work?

many thanks in advanced

regards

Michael Stahlberg
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Stefan Folkerts
Re: Migration plans
April 16, 2019 06:59AM
I think it depends on the size/load on the server.
For smaller environments we even use the midrange read intensive SSD's in
raid 1 (2 of them) or sometimes even raid 5 with a spare and they run for
years, this works just fine for S en M blueprints.
For very intensive environments we tent to use the write intensive SSD's
and in raid 1 (L blueprints).

We run on SUSE Linux and this has been a very stable platform for many of
our customers and our own cloud platform.
With internal SSD's make sure you buy the best internal raid controller you
can get with the correct SSD upgrades, don't skimp on that part.

Size the active log correctly and place that on SSD as well, make
everything a bit bigger than need be, you want to have at least 10GB of
free space on the active log filesystem.




On Tue, Apr 16, 2019 at 11:16 AM Michael Stahlberg <
Michael.Stahlberg@de.verizon.com> wrote:

> HI all,
>
> after long working with ADSM/TSM and migrating from Solaris to AIX about
> 9 years ago, we are now asked to refresh our hardware again. It came out
> that our old backup server are the only AIX server we still have and we
> should thinking about migrating to linux. I'm not real happy about it,
> but I think that it will work. I have some more doubts about the
> hardware we should use. I know that we should have a lot of disks for
> the database, but our databases aren't very big (the biggest is about
> 400 GByte) and to get small disks is difficult. At the moment we have an
> AIX server with an external storage (DS3500) with a lot of disks. The
> plans are to migrate to a HP DL380 system with internal disks. The
> database should be on SSDs so we are not sure if we still should use a
> lot of disks, or if it makes sense to use only 2 or 4 disks mirrored
> with a spare disk, or if it might be useful to use Raid5. Has anybody
> experiences with it, please. The documentation I found about this is in
> my eyes not up to date and so I'm asking this group now, for their
> experiences about this.
> It will be also fine, if somebody did such a migration already. I read
> about export and import the database from AIX to Linux. Has somebody do
> this, please. How did it work?
>
> many thanks in advanced
>
> regards
>
> Michael Stahlberg
>
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