[Beowulf] how cluster's storage can be flexible/expandable?

Vincent Diepeveen diep at xs4all.nl
Mon Nov 12 15:11:05 PST 2012

hi Duke,

Where do you need a parallel file system for if you have 1 fileserver  
in total?

On Nov 12, 2012, at 12:26 PM, Duke Nguyen wrote:

> On 11/12/12 4:42 PM, Tim Cutts wrote:
>> On 12 Nov 2012, at 03:50, Duke Nguyen <duke.lists at gmx.com> wrote:
>>> On 11/9/12 7:26 PM, Bogdan Costescu wrote:
>>>> On Fri, Nov 9, 2012 at 7:19 AM, Christopher Samuel
>>>> <samuel at unimelb.edu.au> wrote:
>>>>> So JBODs with LVM on top and XFS on top of that could be  
>>>>> resized on
>>>>> the fly.  You can do the same with ext[34] as well (from memory).
>>> We also thought of using LVM on top of RAID disks, but never  
>>> think of
>>> XFS. Why do we need XFS and how does this compare with GPFS?
>> XFS is not a parallel filesystem like GPFS, but a lot of us use it  
>> because it's so easy to grow the filesystem.  I frequently do this  
>> with virtual machines to expand their storage.
>> 1)  Add new virtual disk
>> 2)  Scan SCSI buses in Linux
>> 3)  pvcreate the new device
>> 4)  vgextend
>> 5)  lvextend
>> 6)  xfs_growfs
>> Job done.
>> On systems in our data centre, we tend to use XFS for most local  
>> filesystems, unless we have a good reason to use something else.
> Is there any reason you do not use GlusterFS on top of XFS? Can I do
> that? With that, can I have a parallel system similar to GPFS?
> Thanks,
> D.
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