<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Helvetica, sans-serif;">
<div>
<div>IBM in general doesn’t have a comprehensive set of best practices around Spectrum Scale (trying to get used to that!) and SVC or storage system like XIV (or HP 3PAR). From my IBM days (a few years back) I used both with GPFS successfully. I do recall some
discussion regarding a larger block size, but haven’t seen any recent updates. (Scott Fadden, are you listening?) Larger block sizes are problematic for file systems with lots of small files. (like ours)</div>
<div><br>
</div>
<div>- Since SVC is striping data across multiple storage LUNs, and GPFS is striping as well, what’s the possible impact? My thought would be to use image mode vdisks, but that sort of defeats the purpose/utility of SVC.</div>
<div>- IBM specifically points out not to use compression on the SVC/V9000 with GPFS metadata, so if you use these features be careful.</div>
<div>
<div id="MAC_OUTLOOK_SIGNATURE">
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;">
<span style="font-family: Calibri; font-size: medium;"><br>
</span></div>
<div style="color: rgb(0, 0, 0); font-family: Helvetica, sans-serif; font-size: 14px;">
<font face="Helvetica">Bob Oesterlin<br>
Sr Storage Engineer, Nuance Communications<br>
507-269-0413</font></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif; font-size: 14px;">
<br>
</div>
</div>
</div>
</div>
<div><br>
</div>
<span id="OLK_SRC_BODY_SECTION">
<div style="font-family:Calibri; font-size:12pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
<span style="font-weight:bold">From: </span><<a href="mailto:gpfsug-discuss-bounces@gpfsug.org">gpfsug-discuss-bounces@gpfsug.org</a>> on behalf of Christoph Krafft<br>
<span style="font-weight:bold">Reply-To: </span>gpfsug main discussion list<br>
<span style="font-weight:bold">Date: </span>Thursday, August 27, 2015 at 4:36 AM<br>
<span style="font-weight:bold">To: </span>"<a href="mailto:gpfsug-discuss@gpfsug.org">gpfsug-discuss@gpfsug.org</a>"<br>
<span style="font-weight:bold">Subject: </span>[gpfsug-discuss] Best Practices using GPFS with SVC (and XiV)<br>
</div>
<div><br>
</div>
<div>
<div>
<p>Dear GPFS folks,<br>
<br>
I know - it may not be an optimal setup for GPFS ... but is someone willing to share technical best practices when<br>
using GPFS with SVC (and XiV).<br>
<br>
From the past I remember some recommendations concerning the nr of vDisks in SVC and certainly block size (XiV=1M)<br>
could be an issue.<br>
<br>
Thank you very much for sharing any insights with me. <br>
<br>
<br>
<font size="2" face="Arial">Mit freundlichen Grüßen / Sincerely</font><br>
<br>
<b><font face="Arial">Christoph Krafft</font></b><br>
<br>
<font size="2" color="#0055AA" face="Arial">Client Technical Specialist - Power Systems, IBM Systems</font><br>
<font size="2" color="#0055AA" face="Arial">Certified IT Specialist @ The Open Group
</font>
<table border="0" cellspacing="0" cellpadding="0">
<tbody>
<tr valign="top">
<td class="small_font" width="800" colspan="4" valign="middle">
<hr width="100%" size="2" align="left" style="color:#696969; ">
</td>
</tr>
<tr valign="top">
<td class="small_font" width="800" colspan="4" valign="middle"><img width="1" height="1" src="cid:1__=8FBBF43DDFA7F6638f9e8a93df938690918c8FB@" border="0" alt=""></td>
</tr>
<tr valign="top">
<td class="inner" width="87" valign="middle"><font size="2" color="#0055AA" face="Arial">Phone:</font></td>
<td class="inner" width="317" valign="middle"><font size="2" color="#0055AA" face="Arial">+49 (0) 7034 643 2171</font></td>
<td class="inner" width="257" valign="middle"><font size="2" color="#0055AA" face="Arial">IBM Deutschland GmbH</font></td>
<td width="138" rowspan="4" valign="middle">
<div align="right"><img src="cid:2__=8FBBF43DDFA7F6638f9e8a93df938690918c8FB@" width="87" height="30" align="bottom"></div>
</td>
</tr>
<tr valign="top">
<td class="inner" width="87" valign="middle"><font size="2" color="#0055AA" face="Arial">Mobile:</font></td>
<td class="inner" width="317" valign="middle"><font size="2" color="#0055AA" face="Arial">+49 (0) 160 97 81 86 12</font></td>
<td class="inner" width="257" valign="middle"><font size="2" color="#0055AA" face="Arial">Hechtsheimer Str. 2</font></td>
</tr>
<tr valign="top">
<td class="inner" width="87" valign="middle"><font size="2" color="#0055AA" face="Arial">Email:</font></td>
<td class="inner" width="317" valign="middle"><font size="2" color="#0055AA" face="Arial"><a href="mailto:ckrafft@de.ibm.com">ckrafft@de.ibm.com</a></font></td>
<td class="inner" width="257" valign="middle"><font size="2" color="#0055AA" face="Arial">55131 Mainz</font></td>
</tr>
<tr valign="top">
<td class="inner" width="87" valign="middle"><img width="1" height="1" src="cid:1__=8FBBF43DDFA7F6638f9e8a93df938690918c8FB@" border="0" alt=""></td>
<td class="inner" width="317" valign="middle"><img width="1" height="1" src="cid:1__=8FBBF43DDFA7F6638f9e8a93df938690918c8FB@" border="0" alt=""></td>
<td class="inner" width="257" valign="middle"><font size="2" color="#0055AA" face="Arial">Germany</font></td>
</tr>
<tr valign="top">
<td class="small_font" width="800" colspan="4" valign="middle">
<hr width="100%" size="2" align="left" style="color:#696969; ">
</td>
</tr>
<tr valign="top">
<td class="foot" width="800" colspan="4" valign="middle"><font size="2" color="#999999" face="Arial">IBM Deutschland GmbH / Vorsitzender des Aufsichtsrats: Martin Jetter<br>
Geschäftsführung: Martina Koederitz (Vorsitzende), Susanne Peter, Norbert Janzen, Dr. Christian Keller, Ivo Koerner, Markus Koerner<br>
Sitz der Gesellschaft: Ehningen / Registergericht: Amtsgericht Stuttgart, HRB 14562 / WEEE-Reg.-Nr. DE 99369940
</font></td>
</tr>
</tbody>
</table>
<br>
<br>
</p>
</div>
</div>
</span>
</body>
</html>