[gpfsug-discuss] Hardware refresh

Stephen Ulmer ulmer at ulmer.org
Wed Oct 12 02:29:36 BST 2016


I think that the OP was asking why not expand the existing cluster with the new hardware, and just make a new FS?

I’ve not tried to make a cluster talk AFM to itself yet. If that’s impossible, then there’s one good reason to make a new cluster (to use AFM for migration).

Liberty,

-- 
Stephen



> On Oct 11, 2016, at 8:40 PM, Mark.Bush at siriuscom.com wrote:
> 
> Only compelling reason for new cluster would be old hardware is EOL or no longer want to pay maintenance on it.
>  
> From: <gpfsug-discuss-bounces at spectrumscale.org <mailto:gpfsug-discuss-bounces at spectrumscale.org>> on behalf of Marc A Kaplan <makaplan at us.ibm.com <mailto:makaplan at us.ibm.com>>
> Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Date: Tuesday, October 11, 2016 at 2:58 PM
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Subject: Re: [gpfsug-discuss] Hardware refresh
>  
> New FS? Yes there are some good reasons.  
> New cluster?  I did not see a compelling argument either way.
> 
> 
> 
> From:        "Mark.Bush at siriuscom.com <mailto:Mark.Bush at siriuscom.com>" <Mark.Bush at siriuscom.com <mailto:Mark.Bush at siriuscom.com>>
> To:        gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Date:        10/11/2016 03:34 PM
> Subject:        Re: [gpfsug-discuss] Hardware refresh
> Sent by:        gpfsug-discuss-bounces at spectrumscale.org <mailto:gpfsug-discuss-bounces at spectrumscale.org>
> 
> 
> 
> Ok.  I think I am hearing that a new cluster with a new FS and copying data from old to new cluster is the best way forward.  Thanks everyone for your input.  
>  
> From: <gpfsug-discuss-bounces at spectrumscale.org <mailto:gpfsug-discuss-bounces at spectrumscale.org>> on behalf of Yuri L Volobuev <volobuev at us.ibm.com <mailto:volobuev at us.ibm.com>>
> Reply-To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Date: Tuesday, October 11, 2016 at 12:22 PM
> To: gpfsug main discussion list <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>
> Subject: Re: [gpfsug-discuss] Hardware refresh
>   
> This depends on the committed cluster version level (minReleaseLevel) and file system format. Since NFSv2 is an on-disk format change, older code wouldn't be able to understand what it is, and thus if there's a possibility of a downlevel node looking at the NSD, the NFSv1 format is going to be used. The code does NSDv1<->NSDv2 conversions under the covers as needed when adding an empty NSD to a file system.
> 
> I'd strongly recommend getting a fresh start by formatting a new file system. Many things have changed over the course of the last few years. In particular, having a 4K-aligned file system can be a pretty big deal, depending on what hardware one is going to deploy in the future, and this is something that can't be bolted onto an existing file system. Having 4K inodes is very handy for many reasons. New directory format and NSD format changes are attractive, too. And disks generally tend to get larger with time, and at some point you may want to add a disk to an existing storage pool that's larger than the existing allocation map format allows. Obviously, it's more hassle to migrate data to a new file system, as opposed to extending an existing one. In a perfect world, GPFS would offer a conversion tool that seamlessly and robustly converts old file systems, making them as good as new, but in the real world such a tool doesn't exist. Getting a clean slate by formatting a new file system every few years is a good long-term investment of time, although it comes front-loaded with extra work.
> 
> yuri
> 
> <image001.gif>Aaron Knister ---10/10/2016 04:45:31 PM---Can one format NSDv2 NSDs and put them in a filesystem with NSDv1 NSD's? -Aaron
> 
> From: Aaron Knister <aaron.s.knister at nasa.gov <mailto:aaron.s.knister at nasa.gov>>
> To: <gpfsug-discuss at spectrumscale.org <mailto:gpfsug-discuss at spectrumscale.org>>, 
> Date: 10/10/2016 04:45 PM
> Subject: Re: [gpfsug-discuss] Hardware refresh
> Sent by: gpfsug-discuss-bounces at spectrumscale.org <mailto:gpfsug-discuss-bounces at spectrumscale.org>
> 
> 
> 
> 
> Can one format NSDv2 NSDs and put them in a filesystem with NSDv1 NSD's?
> 
> -Aaron
> 
> On 10/10/16 7:40 PM, Luis Bolinches wrote:
> > Hi
> >
> > Creating a new FS sounds like a best way to go. NSDv2 being a very good
> > reason to do so.
> >
> > AFM for migrations is quite good, latest versions allows to use NSD
> > protocol for mounts as well. Olaf did a great job explaining this
> > scenario on the redbook chapter 6
> >
> > http://www.redbooks.ibm.com/abstracts/sg248254.html?Open <http://www.redbooks.ibm.com/abstracts/sg248254.html?Open>
> >
> > --
> > Cheers
> >
> > On 10 Oct 2016, at 23.05, Buterbaugh, Kevin L
> > <Kevin.Buterbaugh at Vanderbilt.Edu <mailto:Kevin.Buterbaugh at vanderbilt.edu>
> > <mailto:Kevin.Buterbaugh at Vanderbilt.Edu <mailto:Kevin.Buterbaugh at Vanderbilt.Edu>>> wrote:
> >
> >> Hi Mark,
> >>
> >> The last time we did something like this was 2010 (we’re doing rolling
> >> refreshes now), so there are probably lots of better ways to do this
> >> than what we did, but we:
> >>
> >> 1) set up the new hardware
> >> 2) created new filesystems (so that we could make adjustments we
> >> wanted to make that can only be made at FS creation time)
> >> 3) used rsync to make a 1st pass copy of everything
> >> 4) coordinated a time with users / groups to do a 2nd rsync when they
> >> weren’t active
> >> 5) used symbolic links during the transition (i.e. rm -rvf
> >> /gpfs0/home/joeuser; ln -s /gpfs2/home/joeuser /gpfs0/home/joeuser)
> >> 6) once everybody was migrated, updated the symlinks (i.e. /home
> >> became a symlink to /gpfs2/home)
> >>
> >> HTHAL…
> >>
> >> Kevin
> >>
> >>> On Oct 10, 2016, at 2:56 PM, Mark.Bush at siriuscom.com <mailto:Mark.Bush at siriuscom.com>
> >>> <mailto:Mark.Bush at siriuscom.com <mailto:Mark.Bush at siriuscom.com>> wrote:
> >>>
> >>> Have a very old cluster built on IBM X3650’s and DS3500.  Need to
> >>> refresh hardware.  Any lessons learned in this process?  Is it
> >>> easiest to just build new cluster and then use AFM?  Add to existing
> >>> cluster then decommission nodes?  What is the recommended process for
> >>> this?
> >>>
> >>>
> >>> Mark
> >>>
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> >>
> >> —
> >> Kevin Buterbaugh - Senior System Administrator
> >> Vanderbilt University - Advanced Computing Center for Research and
> >> Education
> >> Kevin.Buterbaugh at vanderbilt.edu <mailto:Kevin.Buterbaugh at vanderbilt.edu>
> >> <mailto:Kevin.Buterbaugh at vanderbilt.edu <mailto:Kevin.Buterbaugh at vanderbilt.edu>> - (615)875-9633
> >>
> >>
> >>
> >
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