<div dir="ltr">while this is all correct people should think twice about doing this.<div>if you create a filesystem with older versions, it might prevent you from using some features like data-in-inode, encryption, adding 4k disks to existing filesystem, etc even if you will eventually upgrade to the latest code. </div><div><br></div><div>for some customers its a good point in time to also migrate to larger blocksizes compared to what they run right now and migrate the data. i have seen customer systems gaining factors of performance improvements even on existing HW by creating new filesystems with larger blocksize and latest filesystem layout (that they couldn't before due to small file waste which is now partly solved by data-in-inode). while this is heavily dependent on workload and environment its at least worth thinking about. </div><div><br></div><div>sven </div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Mar 16, 2016 at 4:20 PM, Marc A Kaplan <span dir="ltr"><<a href="mailto:makaplan@us.ibm.com" target="_blank">makaplan@us.ibm.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><font size="2" face="sans-serif">The key point is that you must create the
file system so that is "looks" like a 3.5 file system. See
mmcrfs ... --version. Tip: create or find a test filesystem back
on the 3.5 cluster and look at the version string. mmslfs xxx -V.
Then go to the 4.x system and try to create a file system with the
same version string....<br></font><br><br><img align="left" src="cid:_1_1119110811190EC800544F7685257F78" alt="Marc A Kaplan" style="border:0px solid"><br><br>_______________________________________________<br>
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