<?xml version="1.0" encoding="UTF-8"?>
<rss xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:taxo="http://purl.org/rss/1.0/modules/taxonomy/" version="2.0">
  <channel>
    <title>topic Re: SSD host cache - how much needed in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941407#M81418</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;As per Duncan's article on Host cache, its good to keep math simple by allocating cache as same as the memory size.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Other option is monitor the 'swap to host cache value' and allocate the space according to the high value. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;A href="http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/" title="http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/"&gt;http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Wed, 13 Jan 2016 11:27:55 GMT</pubDate>
    <dc:creator>Sreejesh_D</dc:creator>
    <dc:date>2016-01-13T11:27:55Z</dc:date>
    <item>
      <title>SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941405#M81416</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;recently installed ESXi (free) for home use testing/study. ESXi boots from USB stick.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;i have 2 SSD's for storage, one 1TB for VMs and one 64GB for host cache.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;how much cache does the host require? i ask because i'd like to use part of the host cache disk to put a dir on it to store ISOs of OS's i want to install on the 1TB drive and test.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 12 Jan 2016 18:24:17 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941405#M81416</guid>
      <dc:creator>uyozTic</dc:creator>
      <dc:date>2016-01-12T18:24:17Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941406#M81417</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;ESXi-host does not require any host-cache. VMs might. How much? Depends on how much you over-commit host-RAM. If you do not over-commit RAM, you do not need host-cache. And if you reserve all vRAM to VMs, you do not even need virtual machine swap file at all (with 100% vRAM reservation it will be not created).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;In the worst case (when you do over-commit RAM, no sharing/compression/balooning works and all VMs use all vRAM you assigned to them) you might need SSD host-cache of the size:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;"summary_of_vRAM_assigned_to_all_VMs" - "host_RAM_available_for_VMs"&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;But if your SSD host-cache is smaller, it will be used anyway. And when it is full, "normal" swapping will be used (with VM swap files).&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 13 Jan 2016 10:08:33 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941406#M81417</guid>
      <dc:creator>JarryG</dc:creator>
      <dc:date>2016-01-13T10:08:33Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941407#M81418</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;As per Duncan's article on Host cache, its good to keep math simple by allocating cache as same as the memory size.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Other option is monitor the 'swap to host cache value' and allocate the space according to the high value. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;A href="http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/" title="http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/"&gt;http://www.yellow-bricks.com/2011/08/18/swap-to-host-cache-aka-swap-to-ssd/&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 13 Jan 2016 11:27:55 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941407#M81418</guid>
      <dc:creator>Sreejesh_D</dc:creator>
      <dc:date>2016-01-13T11:27:55Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941408#M81419</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Should give you a good hand:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;A href="https://www.vmware.com/files/pdf/techpaper/vfrc-perf-vsphere55.pdf" title="https://www.vmware.com/files/pdf/techpaper/vfrc-perf-vsphere55.pdf"&gt;https://www.vmware.com/files/pdf/techpaper/vfrc-perf-vsphere55.pdf&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 13 Jan 2016 20:05:37 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941408#M81419</guid>
      <dc:creator>AnatolyVilchins</dc:creator>
      <dc:date>2016-01-13T20:05:37Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941409#M81420</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;thank you for your informative reply.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;you and the other poster, in my mind, provided correct answer, can award to both or split? with two such helpful answers i hate to choose between.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 14 Jan 2016 07:51:47 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941409#M81420</guid>
      <dc:creator>uyozTic</dc:creator>
      <dc:date>2016-01-14T07:51:47Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941410#M81421</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;the other very helpful answer/reply. thank you for that.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;how to award you each correct helpful answer?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 14 Jan 2016 07:53:07 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941410#M81421</guid>
      <dc:creator>uyozTic</dc:creator>
      <dc:date>2016-01-14T07:53:07Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941411#M81422</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;a very quick glance, i see i the SSD disk i put in for cache isn't even preferred for this function as its the the PCIe flash card type. that's funny! &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;i'll start to keep an eye on the statistics, more than my normal, but i suspect, as this is a home test/experiment type ESXi setup, i wont see much need for this cache --- now that i understand it better via all of your replies and your pdf link. most are linux VMs and one win2008r2 server &amp;amp;h swap files stored with respective VM. no databases per se except a tiny mysql just for personal goofing about. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;guess it wouldn't hurt to allocate same amount of host RAM to SSD cache and be done with it. its only 64GB ssd drive.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;i really learned a lot here folks, thanks much for replying and helping. &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 14 Jan 2016 08:07:52 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941411#M81422</guid>
      <dc:creator>uyozTic</dc:creator>
      <dc:date>2016-01-14T08:07:52Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941412#M81423</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;No problemo:) &lt;/P&gt;&lt;P&gt;Let us know if you need anything else:) &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 14 Jan 2016 11:47:43 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941412#M81423</guid>
      <dc:creator>AnatolyVilchins</dc:creator>
      <dc:date>2016-01-14T11:47:43Z</dc:date>
    </item>
    <item>
      <title>Re: SSD host cache - how much needed</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941413#M81424</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Couple of weeks back HP Flash FW Upgrade was failing from within ESXi till I turned on Host Caching. Second host same case. Sure it's required for VMs only?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 11 Dec 2018 17:52:34 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/SSD-host-cache-how-much-needed/m-p/941413#M81424</guid>
      <dc:creator>Ganguli</dc:creator>
      <dc:date>2018-12-11T17:52:34Z</dc:date>
    </item>
  </channel>
</rss>

