Re: A beginners guide to implementing ASM

Hi Steve,

Hopefully, you don't want to attach shares to the host using iSCSI?   From my experience, NFSv4.1ismuch  better than iSCSI. If, on the other hand, you want to use FC/AL adapter, then by all means, ASM will probably be much faster than NFS. NFS has local (ZFS appliance) based write-back caching. iSCSI has no caching. That, by itself, should motivate you to choose NFS

Regards

On 2/24/21 5:51 PM, Steve Wales (AddOns) wrote:
>
> Setup:
>
> Linux 7.8
>
> Oracle 19 (mostly, still got a couple I’m in the process of upgrading
> from 18)
>
> The environments I work in are primarily all Linux on Oracle VM’s.
>
> Our config is a stack or Oracle Hosts, running virtual machines
> through Oracle VM Manager (OVM).
>
> The storage appliance is a ZFS Appliance.
>
> Currently all of my databases use Direct NFS for database data file
> access.
>
> When building a new machine the template is set up with a couple of
> virtual disks assigned to the VM that were defined to Linux by using
> ssm with something along the way of:
>
> ssm create -s 59G -n lv_u01 –fstype xfs -p vg_u01 /dev/xvdb /u01
>
> Then we create shares using the ZFS appliance console, and mount them
> to the server and manage those via dNFS.
>
> I want to start looking into ASM.   I’d like to run some performance
> tests on ASM vs dNFS.
>
> I’ve started reading the ASM documentation and notes that I’ve been
> able to find on the Oracle Support site – and my first step appears to
> be to try to create disk presented to the VM and then configure it on
> Linux as a raw disk partition.  Doc Id 452924.1 offers up a few
> examples of disk type to use and Raw disk partition is #1 on that list.
>
> I guess related to that for down the road type stuff, how easy is it
> to extend a raw partition if you need to grow it down the road ?
>
> Found an article on fedoraproject.org using parted, but don’t want to
> muck around too much without knowing what top expect, so I’m hoping to
> get some pointers from here.
>
> I am not a Linux Sysadmin (I know enough to be dangerous) and I am not
> a storage engineer.  Our previous Linux guy has just resigned and
> we’re still interviewing replacements.
>
> So, anyone able to offer me something from their experience that might
> shed some light here.  I don’t have a lot of spare time at the moment
> for a lot of the learn by playing around stuff so was hoping that
> someone might have some real life tales to share or pointers to links
> for my reading (since my Google-fu has found a bunch of stuff for
> mucking around in VirtualBox but that’s not what I’m using here.
>
> Thanks
>
> Steve
>
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Mladen Gogala
Database Consultant
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https://dbwhisperer.wordpress.com


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