[Pvfs2-users] Out of space

[Rob Ross]

Hi Lars,

If you're running LVM, can you just add the disks into the existing servers?

Rob

Lars Roland wrote:
> Hi
> 
> I have a 5 node cluster where each node is having 2TB of space, due to
> some changes in the data model we are running out of space within a
> month or two. According to the FAQ PVFS2 does not handle the addition
> of a new I/O server very well (i.e. it will not get used more than the
> existing ones, since the data is still striped round-robin over the
> old servers). Fortunately I am running LVM on each of the servers so
> my idea is to do something like the following:
> 
> ---
> Add a extra node, create 5 partitions and run NBD on these, now add
> these network block devices to the existing LVM volumes on the
> existing I/O servers (one for each server) and resize the physical
> file system (ZFS) on each I/O servers.
> ----
> 
> Will this work (in short if I resize the underlying file system will
> PVFS2 then use the extra space automatically ?). I know I will se a
> performance degradation (I am trying to get money for five servers
> instead of one so I can add one server to each existing one) but in my
> case running out of space is worse than a performance degradation.
> 
> Is there anyone working on adding the ability to only stripe on a
> section on servers (such that I can add extra servers and get instant
> space utilization) ?.
> 
> -- 
> Lars
> 
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