[gpfsug-discuss] Hardware refresh

[Buterbaugh, Kevin L]

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> 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
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