Directory-based Storage Server stripe config

[Michael Ruepp]

Hi there,

Is it possible to config on a directory-base, on which and how much storage nodes the content will be written and striped?

Example: We use a bunch of sata disks, distributed over four storage server. After a while we want to implement two ssd storage server as (transparent) tier1. We want to put our databases to the max iops tier by setting a directory to stripe to exactly these two ssd servers and by putting the databases into this folder.

Would this be possible?

How handles FhGFS heterogenous configs, e.g. fast and slow storage servers and striping to mixed performance servers?

Thanks,

Mike

[Bernd Schubert]

Hello Michael,

On 03/14/2013 01:45 PM, Michael Ruepp wrote:
> Hi there,
>
> Is it possible to config on a directory-base, on which and how much storage
> nodes the content will be written and striped?

right now you may configure the stripe count (numtargets) per directory,
but not yet the stripe-targets. But it is supported to configure
preferred targets as a mount parameter. So it would be possible to use
different mounts.

>
> Example: We use a bunch of sata disks, distributed over four storage
> server. After a while we want to implement two ssd storage server as
> (transparent) tier1. We want to put our databases to the max iops tier by
> setting a directory to stripe to exactly these two ssd servers and by
> putting the databases into this folder.
>
> Would this be possible?

striping has to be configured using 'fhgfs-ctl --setpattern', for
preferred targets please see the client option 'tunePreferredStorageFile'-

>
> How handles FhGFS heterogenous configs, e.g. fast and slow storage servers
> and striping to mixed performance servers?

So far only targets with a low amount of free disk space are detected.


Best regards,
Bernd

[Michael Ruepp]

Hi Bernd,

thanks. Possibly, this could be the solution use different mount parameters.

Best regards,

Mike