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    <title>Compacting the Zone Database for Downgrading </title>
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<a name="wp1081910"> </a><h1 class="pTitle">
Compacting the Zone Database for Downgrading

</h1>
<a name="wp1081911"> </a><p class="pBody">
Prior to Cisco SAN-OS Release 3.0(1), only 2000 zones are supported per VSAN. If you add more than 
2000 zones to a VSAN, a configuration check is registered to indicate that downgrading to a previous 
release could cause you to lose the zones over the limit. To avoid the configuration check, delete the 
excess zones and compact the zone database for the VSAN. If there are 2000 zones or fewer after 
deleting the excess zones, the compacting process assigns new internal zone IDs and the configuration 
can be supported by Cisco SAN-OS Release 2.x or earlier. Perform this procedure for every VSAN on 
the switch with more than 2000 zones.

</p>
<a name="wp1081912"> </a><p class="pBodyAutonumNoRule">
<strong>Note	&nbsp;&nbsp;&nbsp;</strong> A merge failure occurs when a switch supports more than 2000 zones per VSAN but its neighbor does 
not. Also, zone set activation can fail if the switch has more than 2000 zones per VSAN and not all 
switches in the fabric support more than 2000 zones per VSAN.

</p>
<a name="wp1081940"> </a><p class="pBody">
To compact the zone database for downgrading, refer to the <em class="cEmphasis">Cisco MDS 9000 Family NX-OS Fabric 
Configuration Guide</em>.

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<hr /><br><p class="pBody">Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.</p> 

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