[gpfsug-discuss] HAWC and LROC

[Dean Hildebrand]

Just adding in that with HAWC, you can also use a shared fast storage
device (instead of a node local SSD).  So, for example, if you already have
your metadata stored in a shared SSD server, then you can just enable HAWC
without any additional replication requirements.

Dean



From:	Sven Oehme <oehmes at gmail.com>
To:	gpfsug main discussion list <gpfsug-discuss at spectrumscale.org>
Date:	11/05/2016 09:18 AM
Subject:	Re: [gpfsug-discuss] HAWC and LROC
Sent by:	gpfsug-discuss-bounces at spectrumscale.org



Yes and no :)

While olaf is right, it needs two independent blockdevices, partitions are
just fine.
So one could have in fact have a 200g ssd as a boot device and partitions
it lets say

30g os
20g hawc
150g lroc

you have to keep in mind that lroc and hawc have 2 very different
requirements on the 'device'. if you loose hawc, you loose one copy of
critical data (that's why the log needs to be replicated), if you loose
lroc, you only loose cached data stored somewhere else, so the
recommendation is to use soemwhat reliable 'devices' for hawc, while for
lroc it could be simple consumer grade ssd's.
So if you use one for both, it should be reliable.

Sven

On Sat, Nov 5, 2016, 6:40 AM Olaf Weiser <olaf.weiser at de.ibm.com> wrote:
  You can use both -HAWC ,LROC- on the same node... but you need
  dedicated ,independent ,block devices ...
  In addition for hawc, you could consider replication and use 2 devices,
  even across 2 nodes. ...

  Gesendet von IBM Verse

  leslie elliott --- [gpfsug-discuss] HAWC and LROC ---
                                                                           
 Von:    "leslie elliott" <leslie.james.elliott at gmail.com>                 
                                                                           
 An:     "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org>  
                                                                           
 Datum:  Sa. 05.11.2016 02:09                                              
                                                                           
 Betreff [gpfsug-discuss] HAWC and LROC                                    
 :                                                                         
                                                                           




  Hi I am curious if anyone has run these together on a client and whether
  it helped

  If we wanted to have these functions out at the client to optimise
  compute IO in a couple of special cases

  can both exist at the same time on the same nonvolatile hardware or do
  the two functions need independent devices

  and what would be the process to disestablish them on the clients as the
  requirement was satisfied

  thanks

  leslie

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