<html><body><p>Just to expand a bit on the use of peer snapshots. The point of psnap is to create a snapshot in the cache that is identical to a snapshot on the home. This way you can recover files from a snapshot of a fileset on the 'replica' of the data just like you can from a snapshot in the 'cache' (where the data was generated). With IW mode, its typically possible that the data could be changing on the home from another cache or clients directly running on the data on the home. In this case, it would be impossible to ensure that the snapshots in the cache and on the home are identical.<br><br>Dean <br><img width="16" height="16" src="cid:1__=07BBF56BDFF114098f9e8a93df938690918c07B@" border="0" alt="Inactive hide details for "Shankar Balasubramanian" ---07/21/2016 05:52:32 PM---Peer snapshots will not work for independent wr"><font color="#424282">"Shankar Balasubramanian" ---07/21/2016 05:52:32 PM---Peer snapshots will not work for independent writers as they are purely meant for Single Write. It w</font><br><br><font size="2" color="#5F5F5F">From: </font><font size="2">"Shankar Balasubramanian" <shankbal@in.ibm.com></font><br><font size="2" color="#5F5F5F">To: </font><font size="2">gpfsug main discussion list <gpfsug-discuss@spectrumscale.org></font><br><font size="2" color="#5F5F5F">Date: </font><font size="2">07/21/2016 05:52 PM</font><br><font size="2" color="#5F5F5F">Subject: </font><font size="2">Re: [gpfsug-discuss] AFM Peer Snapshots over GPFS Protocol</font><br><font size="2" color="#5F5F5F">Sent by: </font><font size="2">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr width="100%" size="2" align="left" noshade style="color:#8091A5; "><br><br><br><font size="4">Peer snapshots will not work for independent writers as they are purely meant for Single Write. It will work both for GPFS and NFS protocols. For AFM to work well with GPFS protocol, you should have high bandwidth, reliable network. <br><br><br>Best Regards,<br>Shankar Balasubramanian<br>STSM, AFM & Async DR Development<br>IBM Systems<br>Bangalore - Embassy Golf Links <br>India<br><br><br><br></font><img src="cid:1__=07BBF56BDFF114098f9e8a93df938690918c07B@" width="16" height="16" alt="Inactive hide details for Luke Raimbach ---07/21/2016 10:45:51 PM---Dear GPFS Experts, I've worn my brain out today with AFM an"><font size="4" color="#424282">Luke Raimbach ---07/21/2016 10:45:51 PM---Dear GPFS Experts, I've worn my brain out today with AFM and Windows ACLs, but more questions just k</font><font size="4"><br></font><font color="#5F5F5F"><br>From: </font>Luke Raimbach <Luke.Raimbach@crick.ac.uk><font color="#5F5F5F"><br>To: </font>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><font color="#5F5F5F"><br>Date: </font>07/21/2016 10:45 PM<font color="#5F5F5F"><br>Subject: </font>[gpfsug-discuss] AFM Peer Snapshots over GPFS Protocol<font color="#5F5F5F"><br>Sent by: </font>gpfsug-discuss-bounces@spectrumscale.org<font size="4"><br></font><hr width="100%" size="2" align="left" noshade><font size="4"><br><br></font><tt><font size="4"><br>Dear GPFS Experts,<br><br>I've worn my brain out today with AFM and Windows ACLs, but more questions just keep on coming....<br><br>What's the story with Peer Snapshot functionality over GPFS protocol? Will it ever work, or should I crank my nice setup down a notch to NFS?<br><br>Are peer snapshots supposed to work over NFS for Independent Writer mode AFM caches, or just Single Writers?<br><br>Like Barry says, new AFM toys are great. Can we have more, please?<br><br>Cheers,<br>Luke,<br><br>Luke Raimbach​<br>Senior HPC Data and Storage Systems Engineer,<br>The Francis Crick Institute,<br>Gibbs Building,<br>215 Euston Road,<br>London NW1 2BE.<br><br>E: luke.raimbach@crick.ac.uk<br>W: </font></tt><tt><font size="4">www.crick.ac.uk</font></tt><tt><font size="4"><br><br>The Francis Crick Institute Limited is a registered charity in England and Wales no. 1140062 and a company registered in England and Wales no. 06885462, with its registered office at 215 Euston Road, London NW1 2BE.<br>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org</font></tt><tt><u><font size="4" color="#0000FF"><br></font></u></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss"><tt><u><font size="4" color="#0000FF">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</font></u></tt></a><font size="4"><br><br></font><tt>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br></tt><tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</a></tt><tt><br></tt><br><br><BR>
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