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Re: Using ASM for shared linux filesystem storage?

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On 30.07.2016 14:19, dkoleary@olearycomputers.com wrote:

> The dba team and I (UNIX admin) are being asked to create a shared
> ext4 filesystem across a number of nodes.  I believe this is to
> enable us to remove Veritas Cluster Filesystem (VCFS); but, that's
> just a suspicion.

That is odd: they want a filesystem that is intended to live in a single 
block device to be created as replacement for a cluster filesystem?  I 
mean, there are free and open source cluster filesystems around, why not 
pick those?  I am thinking of

  - GlusterFS
  - GFS
  - CephFS
  - Lustre
  - maybe even OCFS
  - more at [1]

For an ext4 you need a single block device.  So to have it distributed 
you need a distributed block device.  Maybe you can pull off something 
like this with DRBD but as far as I understand the whole block device is 
mirrored on every node.  It seems to me that a technical superior 
solution is a networked file system because at the filesystem level you 
have much more knowledge about the data, distribution and failover needs 
than on the block device level.  Higher level, more semantic - it's as 
easy as that.

> So, the questions: has anyone used ASM to create a shared storage
> filesystem across nodes that are not in any way otherwise related to
> oracle products?  I know the dbas create shared filesystems via CRS;
> however, I've not seen ext4 being used.  Is that possible/supported/a
> good idea?

I'd think it's not a good idea.  Minimum, one would need more 
information where that requirement to make it ext4 came from to come to 
a more informed conclusion.

> If anyone has any information, documentation, etc, I'd appreciate
> getting a pointer.

I hope I provided some.

Kind regards

	robert


[1] 
https://en.wikipedia.org/wiki/List_of_file_systems#Distributed_file_systems

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Using ASM for shared linux filesystem storage? dkoleary@olearycomputers.com - 2016-07-30 05:19 -0700
  Re: Using ASM for shared linux filesystem storage? Robert Klemme <shortcutter@googlemail.com> - 2016-07-30 18:30 +0200
    Re: Using ASM for shared linux filesystem storage? Doug OLeary <dkoleary@olearycomputers.com> - 2016-07-30 11:16 -0700
      Re: Using ASM for shared linux filesystem storage? Robert Klemme <shortcutter@googlemail.com> - 2016-07-31 11:03 +0200

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