`<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">The most recent bloody update has this feature. Bloody users should read below.<div class=""><br class=""></div><div class="">Dan</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">"George Wilson" <<a href="mailto:george.wilson@delphix.com" class="">george.wilson@delphix.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">[developer] Heads-up: 6950 ARC should cache compressed data</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">July 14, 2016 at 3:57:13 PM EDT<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">"<<a href="mailto:developer@lists.illumos.org" class="">developer@lists.illumos.org</a>>" <<a href="mailto:developer@lists.illumos.org" class="">developer@lists.illumos.org</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Reply-To: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><a href="mailto:developer@lists.illumos.org" class="">developer@lists.illumos.org</a><br class=""></span></div><br class=""><div class=""><div dir="ltr" class="">The compressed ARC feature has just integrated into illumos. This feature introduces compression into the ZFS cache and will keep blocks compressed in memory if they are compressed on disk. Blocks will be decompressed on demand and the uncompressed copy will be discarded once the consumer is no longer referencing it. Users can disable the compressed ARC feature by doing the following:<div class=""><br class=""></div><div class="">mdb -ke "zfs_compressed_arc_enabled/W 0"</div><div class=""><br class=""></div><div class="">This can be done dynamically and will only impact newly cached blocks. Blocks already in the cache will remain compressed until they are evicted. <br class=""><div class=""><br class=""></div><div class="">This feature also include a 100MB (by default) dbuf cache which keep blocks uncompressed that are recently accessed.<div class=""><br class="">You can adjust the default value of the dbuf cache by doing the following:</div><div class=""><br class=""></div><div class="">mdb -ke "dbuf_cache_max_bytes/Z 0t209715200" /* 200MB dbuf cache */</div><div class=""><br class=""></div><div class="">For more information you can check out the slides on <a href="http://postlink.www.listbox.com/2166757/3affccb54cf4be1589fb8cea18eeda1a/21175029/47b6a23e?uri=aHR0cDovL29wZW4temZzLm9yZw" class="">open-zfs.org</a> located here: </div><div class=""><br class=""></div><div class=""><a href="http://postlink.www.listbox.com/2166758/4a0070dc45fa6e9f739152f11e35726e/21175029/47b6a23e?uri=aHR0cHM6Ly9nb28uZ2wvUmE0Znc5" style="margin:0px;padding:0px;border:0px;outline:0px;font-size:13px;vertical-align:baseline;background-color:rgb(255,255,211)" tabindex="-1" class="">http://goo.gl/Ra4fw9</a><br class=""></div><div class=""><br class=""></div><div class="">Please contact me if you have any questions.</div><div class=""><br class=""></div><div class="">Enjoy,</div><div class="">George</div><div class=""><br class=""></div><div class=""><br class=""></div></div></div></div><div bgcolor="#ffffff" id="listbox-footer" style="width:auto;margin:0;padding:5px;background-color:#fff;clear:both;border-top: 1px solid #ccc;" class=""><table bgcolor="#ffffff" border="0" cellpadding="0" cellspacing="0" style="background-color:#fff" width="100%" class=""><tbody class=""><tr class=""><td padding="4px" class=""><font color="#333333" size="1" style="font-family:helvetica, sans-serif;" class="">
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