Re: [MooseFS-Users] Using virtual drives

[Casper L. <cas...@pr...>]

Hi WU,

I run something similar, I have two different versions of mfs running
simultaneously, because I am transitioning from a platter-disk mfs2 cluster
to an ssd mfs3 pro cluster.

I'm not experiencing any problems except that with normal Debian packages
there is no way to simultaneously use two client versions.

Greetings, Casper

Op zo 5 mrt. 2017 23:39 schreef web user <web...@gm...>:

> I'm trying to create a second mfs server and chunks on my network
> consisting of only ssd drives. To do this I wanted to use available space
> on existing ssd drives on some of my compute servers.
>
> I see that the option of using a virtual drive is not mentioned in the
> existing docs for (2.x and 3.x). Here are the steps that I found from an
> old doc:
>
> #mkdir -p /storage/mfschunks
> #dd if=/dev/zero of=/storage/mfschunks/mfschunks1 bs=1024 count=1
> seek=$((2*1024*1024-1))
> #mkfs -t ext3 /storage/mfschunks/mfschunks1
> #mkdir -p /mnt/mfschunks1
> #mount -t ext3 -o loop /storage/mfschunks/mfschunks1 /mnt/mfschunks1
> #dd if=/dev/zero of=/storage/mfschunks/mfschunks2 bs=1024 count=1
> seek=$((2*1024*1024-1))
> #mkfs -t ext3 /storage/mfschunks/mfschunks2
> #mkdir -p /mnt/mfschunks2
> #mount -t ext3 -o loop /storage/mfschunks/mfschunks2 /mnt/mfsc
>
> I have the following questions:
>
> 1. The data for this partition is scratch and I'm not too worried if I
> loose all of it. Are the instructions still valid? I'm using ubuntu
> 14.04LTS. Any downsides that I should be aware off
> 2. Is there any harm of having two mfs servers running on two different
> machines? Will I able to mound two different mfs drives on one client
> machine.
>
> mfsmount /mnt/mfs -H mfsserever
> mfsmount /mnt/mfsssd -H mfssereverssd
>
> Thanks in advance,
>
> WU
>
>
>
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