VCF Memory Tiering Calculator \u2014 irgNET<\/title>\n<style>\n @import url('https:\/\/fonts.googleapis.com\/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');\n\n :root{\n --bg:#F4F8FD;\n --panel:#FFFFFF;\n --panel-2:#EEF4FC;\n --line:#D8E5F5;\n --text:#101826;\n --muted:#5B6B85;\n --accent:#0057FF;\n --accent-2:#0079FF;\n --accent-light:#00ACFF;\n --accent-dim:#E4EEFF;\n --good:#00ACFF;\n --warn:#B9720C;\n --danger:#C0392B;\n --radius:10px;\n }\n *{box-sizing:border-box;}\n html,body{margin:0;padding:0;}\n body{\n color:var(--text);\n font-family:'Inter',system-ui,sans-serif;\n -webkit-font-smoothing:antialiased;\n padding:0;\n background:transparent;\n }\n .wrap{max-width:1040px;margin:0 auto;background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:24px;box-shadow:0 1px 3px rgba(20,20,10,0.04);}\n\n .hdr{display:flex;align-items:center;justify-content:flex-end;margin-bottom:18px;}\n .hdr 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class=\"grid\">\n\n \n <div class=\"panel\">\n <h2>Cluster & DRAM<\/h2>\n <div class=\"field\">\n <label>Hosts in cluster <span class=\"val\" id=\"hostsVal\">4<\/span><\/label>\n <input type=\"range\" id=\"hosts\" min=\"1\" max=\"32\" value=\"4\" step=\"1\">\n <\/div>\n <div class=\"field\">\n <label>DRAM per host<\/label>\n <select id=\"dramSize\">\n <option value=\"256\">256 GB<\/option>\n <option value=\"512\">512 GB<\/option>\n <option value=\"768\">768 GB<\/option>\n <option value=\"1024\" selected>1 TB<\/option>\n <option value=\"1536\">1.5 TB<\/option>\n <option value=\"2048\">2 TB<\/option>\n <option value=\"3072\">3 TB<\/option>\n <option value=\"4096\">4 TB<\/option>\n <\/select>\n <\/div>\n <div class=\"field\">\n <label>Redundancy for NVMe tier<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"redundancy\" data-val=\"none\" class=\"active\">None<\/button>\n <button data-group=\"redundancy\" data-val=\"raid1\">HW RAID-1<\/button>\n <button data-group=\"redundancy\" data-val=\"mirror\">SW Mirror (9.1)<\/button>\n <\/div>\n <\/div>\n <div class=\"field\">\n <label>NVMe device size<\/label>\n <select id=\"nvmeSize\">\n <option value=\"1.92\">1.92 TB<\/option>\n <option value=\"3.84\" selected>3.84 TB<\/option>\n <option value=\"7.68\">7.68 TB<\/option>\n <option value=\"15.36\">15.36 TB<\/option>\n <\/select>\n <\/div>\n <\/div>\n\n \n <div class=\"panel\">\n <h2>Tiering Ratio<\/h2>\n <div class=\"field\">\n <label>Mem.TierNVMePct <span class=\"val\" id=\"ratioVal\">100%<\/span><\/label>\n <input type=\"range\" id=\"ratio\" min=\"25\" max=\"400\" value=\"100\" step=\"25\">\n <div class=\"presets\">\n <button data-preset=\"50\">50% \u2013 conservative<\/button>\n <button data-preset=\"100\" class=\"active\">100% \u2013 default \/ BP<\/button>\n <button data-preset=\"200\">200% \u2013 VDI<\/button>\n <button data-preset=\"400\">400% \u2013 max<\/button>\n <\/div>\n <\/div>\n <div class=\"divider\"><\/div>\n <div class=\"field\" style=\"margin-bottom:0;\">\n <label style=\"margin-bottom:8px;\">Workload profile<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"profile\" data-val=\"general\" class=\"active\">General<\/button>\n <button data-group=\"profile\" data-val=\"vdi\">VDI<\/button>\n <button data-group=\"profile\" data-val=\"perf\">Perf-sensitive<\/button>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"panel result-panel\">\n <h2>Result<\/h2>\n\n <div class=\"headline\">\n <div>\n <div class=\"lbl\">Total logical memory \/ host<\/div>\n <div class=\"num\" id=\"totalOut\">0<span>GB<\/span><\/div>\n <\/div>\n <div class=\"ratio\" id=\"ratioOut\">+0% vs. DRAM only<\/div>\n <\/div>\n\n <div class=\"stack\" id=\"stackBar\"><\/div>\n <div class=\"legend\">\n <span><span class=\"dot\" style=\"background:var(--accent)\"><\/span>DRAM (Tier 0)<\/span>\n <span><span class=\"dot\" style=\"background:var(--good)\"><\/span>NVMe Tier (Tier 1)<\/span>\n <\/div>\n\n <div class=\"breakdown\">\n <div class=\"bd-item\"><div class=\"k\">DRAM \/ host<\/div><div class=\"v\" id=\"dramOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">NVMe tier \/ host<\/div><div class=\"v\" id=\"nvmeOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Total cluster memory<\/div><div class=\"v\" id=\"clusterOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">NVMe devices \/ host<\/div><div class=\"v\" id=\"devicesOut\">\u2013<\/div><\/div>\n <\/div>\n\n <div class=\"note\" id=\"tcoNote\"><\/div>\n <div class=\"note\" id=\"policyNote\"><\/div>\n <div class=\"note warn\" id=\"warnNote\" style=\"display:none;\"><\/div>\n <div class=\"note danger\" id=\"dangerNote\" style=\"display:none;\"><\/div>\n <\/div>\n\n <\/div>\n\n <footer>\u00a9 irgNET \u2014 All calculations run locally in your browser; no data is transmitted. Figures are estimates based on publicly documented VCF 9.0\/9.1 Memory Tiering best practices (Broadcom\/VMware). Always validate against official sizing guidance and test with your actual workloads before production changes.<\/footer>\n<\/div>\n\n<script>\n(function(){\n const $ = id => document.getElementById(id);\n let redundancy = 'none';\n let profile = 'general';\n\n const MAX_PARTITION_TB = 4; \/\/ current max supported NVMe tier partition size per device\n const DRAM_COST_PER_GB = 10; \/\/ indicative only\n const NVME_COST_PER_GB = 1; \/\/ indicative only\n\n document.querySelectorAll('[data-group=\"redundancy\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"redundancy\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n redundancy = btn.dataset.val;\n calc();\n });\n });\n\n document.querySelectorAll('[data-group=\"profile\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"profile\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n profile = btn.dataset.val;\n calc();\n });\n });\n\n document.querySelectorAll('[data-preset]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n $('ratio').value = btn.dataset.preset;\n document.querySelectorAll('[data-preset]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n $('ratioVal').textContent = btn.dataset.preset + '%';\n calc();\n });\n });\n\n function wireRange(rangeId, labelId, suffix){\n const r = $(rangeId);\n r.addEventListener('input', ()=>{\n $(labelId).textContent = r.value + (suffix || '');\n document.querySelectorAll('[data-preset]').forEach(b=>{\n b.classList.toggle('active', b.dataset.preset === r.value);\n });\n calc();\n });\n }\n wireRange('hosts','hostsVal');\n wireRange('ratio','ratioVal','%');\n\n ['dramSize','nvmeSize'].forEach(id=>{\n $(id).addEventListener('change', calc);\n });\n\n function fmtGB(gb){\n if(gb >= 1024) return (gb\/1024).toFixed(2) + ' TB';\n return gb.toFixed(0) + ' GB';\n }\n\n function calc(){\n const hosts = parseInt($('hosts').value);\n const dramGB = parseInt($('dramSize').value);\n const ratioPct = parseInt($('ratio').value);\n const nvmeDeviceTB = parseFloat($('nvmeSize').value);\n\n const nvmeTierGB_raw = dramGB * (ratioPct\/100);\n const maxPartitionGB = MAX_PARTITION_TB * 1024;\n const capped = nvmeTierGB_raw > maxPartitionGB;\n const nvmeTierGB = Math.min(nvmeTierGB_raw, maxPartitionGB);\n\n const totalPerHost = dramGB + nvmeTierGB;\n const clusterTotal = totalPerHost * hosts;\n const clusterDram = dramGB * hosts;\n\n \/\/ devices needed per host\n let devicesPerHost;\n if(redundancy === 'none'){\n devicesPerHost = 1; \/\/ VCF currently mounts only a single device per host (no aggregation)\n } else {\n devicesPerHost = 2; \/\/ RAID-1 or software mirror both need 2 identical\/larger devices\n }\n const deviceCoversNeed = (nvmeDeviceTB*1024) >= nvmeTierGB;\n\n \/\/ render\n $('totalOut').innerHTML = fmtGB(totalPerHost).replace(' ', '<span>') + '<\/span>';\n \/\/ fix: simpler formatting\n const totalParts = fmtGB(totalPerHost).split(' ');\n $('totalOut').innerHTML = totalParts[0] + '<span>' + totalParts[1] + '<\/span>';\n\n const gainPct = ((totalPerHost\/dramGB - 1)*100).toFixed(0);\n $('ratioOut').textContent = '+' + gainPct + '% vs. DRAM only';\n\n $('dramOut').textContent = fmtGB(dramGB);\n $('nvmeOut').textContent = fmtGB(nvmeTierGB) + (capped ? ' (capped)' : '');\n $('clusterOut').textContent = fmtGB(clusterTotal);\n $('devicesOut').textContent = devicesPerHost + 'x ' + nvmeDeviceTB + 'TB';\n\n const pctDram = (dramGB\/totalPerHost)*100;\n const pctNvme = 100-pctDram;\n $('stackBar').innerHTML =\n '<div class=\"seg dram\" style=\"width:'+pctDram+'%\"><\/div>' +\n '<div class=\"seg nvme\" style=\"width:'+pctNvme+'%\"><\/div>';\n\n \/\/ TCO estimate (indicative only)\n const rawNvmeGBNeeded = devicesPerHost * nvmeDeviceTB * 1024;\n const costDramOnly = (totalPerHost * hosts) * DRAM_COST_PER_GB;\n const costTiered = (clusterDram * DRAM_COST_PER_GB) + (rawNvmeGBNeeded * hosts * NVME_COST_PER_GB);\n const savingsPct = Math.max(0, ((costDramOnly-costTiered)\/costDramOnly)*100).toFixed(0);\n $('tcoNote').textContent = 'Indicative TCO: reaching ' + fmtGB(totalPerHost) + '\/host with DRAM alone vs. this tiered setup could be roughly ' + savingsPct + '% cheaper on memory hardware cost (using ~$' + DRAM_COST_PER_GB + '\/GB DRAM vs. ~$' + NVME_COST_PER_GB + '\/GB NVMe as rough public reference prices \u2014 validate against your actual procurement quotes).';\n\n let policyMsg = 'Mem.TierNVMePct = ' + ratioPct + '%. Default and general best practice is 100% (1:1). ';\n if(profile === 'vdi'){\n policyMsg += 'For VDI, ratios up to 200% are commonly used since desktop workloads carry a large share of cold\/inactive memory.';\n } else if(profile === 'perf'){\n policyMsg += 'For latency-sensitive or performance-critical workloads, keep the ratio low (or disable tiering per-VM) \u2014 tiering is not supported for FT VMs, low-latency VMs, SEV\/SGX\/TDX security VMs, monster VMs (\u22651TB RAM \/ 128 vCPU), vGPU VMs, and nested VMs.';\n } else {\n policyMsg += 'Tiering typically only engages once host DRAM (Tier 0) usage reaches roughly 60\u201370%; below that, memory stays on DRAM to protect performance and NVMe endurance.';\n }\n $('policyNote').textContent = policyMsg;\n\n const warnEl = $('warnNote');\n if(redundancy === 'none'){\n warnEl.style.display = 'block';\n warnEl.textContent = 'No redundancy selected: if the single NVMe tier device fails, Tier 1 memory is lost. VCF currently mounts only one tier device per host (no automatic aggregation across multiple non-redundant devices).';\n } else {\n warnEl.style.display = 'none';\n }\n\n const dangerEl = $('dangerNote');\n if(capped || !deviceCoversNeed){\n dangerEl.style.display = 'block';\n let msgs = [];\n if(capped) msgs.push('Requested NVMe tier (' + fmtGB(nvmeTierGB_raw) + ') exceeds the current 4TB max partition size per device \u2014 capped to 4TB in this calculation.');\n if(!deviceCoversNeed) msgs.push('Selected NVMe device (' + nvmeDeviceTB + 'TB) is smaller than the NVMe tier needed (' + fmtGB(nvmeTierGB) + ') \u2014 pick a larger device.');\n dangerEl.textContent = msgs.join(' ');\n } else {\n dangerEl.style.display = 'none';\n }\n }\n\n calc();\n})();\n<\/script>\n<\/body>\n<\/html>\n","protected":false},"excerpt":{"rendered":"<p>VCF Memory Tiering Calculator \u2014 irgNET Cluster & DRAM Hosts in cluster 4 DRAM per host 256 GB512 GB768 GB1 TB1.5 TB2 TB3 TB4 TB Redundancy for NVMe tier None HW RAID-1 SW Mirror (9.1) NVMe device size 1.92 TB3.84 TB7.68 TB15.36 TB Tiering Ratio Mem.TierNVMePct 100% 50% \u2013 conservative 100% \u2013 default \/ BP […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-14399","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>Memory Tiering Calc - 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{"id":14399,"date":"2026-08-24T10:36:04","date_gmt":"2026-08-24T08:36:04","guid":{"rendered":"https:\/\/irg-net.com\/?page_id=14399"},"modified":"2026-08-24T10:36:06","modified_gmt":"2026-08-24T08:36:06","slug":"memory-tiering-calc","status":"publish","type":"page","link":"https:\/\/irg-net.com\/index.php\/memory-tiering-calc\/","title":{"rendered":"Memory Tiering Calc"},"content":{"rendered":"\n\n\n\n\n\nVCF Memory Tiering Calculator \u2014 irgNET<\/title>\n<style>\n @import url('https:\/\/fonts.googleapis.com\/css2?family=Space+Grotesk:wght@500;600;700&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500;600&display=swap');\n\n :root{\n --bg:#F4F8FD;\n --panel:#FFFFFF;\n --panel-2:#EEF4FC;\n --line:#D8E5F5;\n --text:#101826;\n --muted:#5B6B85;\n --accent:#0057FF;\n --accent-2:#0079FF;\n --accent-light:#00ACFF;\n --accent-dim:#E4EEFF;\n --good:#00ACFF;\n --warn:#B9720C;\n --danger:#C0392B;\n --radius:10px;\n }\n *{box-sizing:border-box;}\n html,body{margin:0;padding:0;}\n 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.note{margin-top:16px;font-size:12px;color:var(--muted);line-height:1.5;border-left:2px solid var(--line);padding-left:10px;}\n .note.warn{border-left-color:var(--warn);color:#8a5c07;}\n .note.danger{border-left-color:var(--danger);color:#8f2c20;}\n .note a{color:var(--accent-2);}\n\n footer{margin-top:22px;text-align:center;font-size:11.5px;color:var(--muted);}\n footer a{color:var(--muted);}\n<\/style>\n<\/head>\n<body>\n\n<div class=\"wrap\">\n\n <div class=\"grid\">\n\n \n <div class=\"panel\">\n <h2>Cluster & DRAM<\/h2>\n <div class=\"field\">\n <label>Hosts in cluster <span class=\"val\" id=\"hostsVal\">4<\/span><\/label>\n <input type=\"range\" id=\"hosts\" min=\"1\" max=\"32\" value=\"4\" step=\"1\">\n <\/div>\n <div class=\"field\">\n <label>DRAM per host<\/label>\n <select id=\"dramSize\">\n <option value=\"256\">256 GB<\/option>\n <option value=\"512\">512 GB<\/option>\n <option value=\"768\">768 GB<\/option>\n <option value=\"1024\" selected>1 TB<\/option>\n <option value=\"1536\">1.5 TB<\/option>\n <option value=\"2048\">2 TB<\/option>\n <option value=\"3072\">3 TB<\/option>\n <option value=\"4096\">4 TB<\/option>\n <\/select>\n <\/div>\n <div class=\"field\">\n <label>Redundancy for NVMe tier<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"redundancy\" data-val=\"none\" class=\"active\">None<\/button>\n <button data-group=\"redundancy\" data-val=\"raid1\">HW RAID-1<\/button>\n <button data-group=\"redundancy\" data-val=\"mirror\">SW Mirror (9.1)<\/button>\n <\/div>\n <\/div>\n <div class=\"field\">\n <label>NVMe device size<\/label>\n <select id=\"nvmeSize\">\n <option value=\"1.92\">1.92 TB<\/option>\n <option value=\"3.84\" selected>3.84 TB<\/option>\n <option value=\"7.68\">7.68 TB<\/option>\n <option value=\"15.36\">15.36 TB<\/option>\n <\/select>\n <\/div>\n <\/div>\n\n \n <div class=\"panel\">\n <h2>Tiering Ratio<\/h2>\n <div class=\"field\">\n <label>Mem.TierNVMePct <span class=\"val\" id=\"ratioVal\">100%<\/span><\/label>\n <input type=\"range\" id=\"ratio\" min=\"25\" max=\"400\" value=\"100\" step=\"25\">\n <div class=\"presets\">\n <button data-preset=\"50\">50% \u2013 conservative<\/button>\n <button data-preset=\"100\" class=\"active\">100% \u2013 default \/ BP<\/button>\n <button data-preset=\"200\">200% \u2013 VDI<\/button>\n <button data-preset=\"400\">400% \u2013 max<\/button>\n <\/div>\n <\/div>\n <div class=\"divider\"><\/div>\n <div class=\"field\" style=\"margin-bottom:0;\">\n <label style=\"margin-bottom:8px;\">Workload profile<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"profile\" data-val=\"general\" class=\"active\">General<\/button>\n <button data-group=\"profile\" data-val=\"vdi\">VDI<\/button>\n <button data-group=\"profile\" data-val=\"perf\">Perf-sensitive<\/button>\n <\/div>\n <\/div>\n <\/div>\n\n \n <div class=\"panel result-panel\">\n <h2>Result<\/h2>\n\n <div class=\"headline\">\n <div>\n <div class=\"lbl\">Total logical memory \/ host<\/div>\n <div class=\"num\" id=\"totalOut\">0<span>GB<\/span><\/div>\n <\/div>\n <div class=\"ratio\" id=\"ratioOut\">+0% vs. DRAM only<\/div>\n <\/div>\n\n <div class=\"stack\" id=\"stackBar\"><\/div>\n <div class=\"legend\">\n <span><span class=\"dot\" style=\"background:var(--accent)\"><\/span>DRAM (Tier 0)<\/span>\n <span><span class=\"dot\" style=\"background:var(--good)\"><\/span>NVMe Tier (Tier 1)<\/span>\n <\/div>\n\n <div class=\"breakdown\">\n <div class=\"bd-item\"><div class=\"k\">DRAM \/ host<\/div><div class=\"v\" id=\"dramOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">NVMe tier \/ host<\/div><div class=\"v\" id=\"nvmeOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Total cluster memory<\/div><div class=\"v\" id=\"clusterOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">NVMe devices \/ host<\/div><div class=\"v\" id=\"devicesOut\">\u2013<\/div><\/div>\n <\/div>\n\n <div class=\"note\" id=\"tcoNote\"><\/div>\n <div class=\"note\" id=\"policyNote\"><\/div>\n <div class=\"note warn\" id=\"warnNote\" style=\"display:none;\"><\/div>\n <div class=\"note danger\" id=\"dangerNote\" style=\"display:none;\"><\/div>\n <\/div>\n\n <\/div>\n\n <footer>\u00a9 irgNET \u2014 All calculations run locally in your browser; no data is transmitted. Figures are estimates based on publicly documented VCF 9.0\/9.1 Memory Tiering best practices (Broadcom\/VMware). Always validate against official sizing guidance and test with your actual workloads before production changes.<\/footer>\n<\/div>\n\n<script>\n(function(){\n const $ = id => document.getElementById(id);\n let redundancy = 'none';\n let profile = 'general';\n\n const MAX_PARTITION_TB = 4; \/\/ current max supported NVMe tier partition size per device\n const DRAM_COST_PER_GB = 10; \/\/ indicative only\n const NVME_COST_PER_GB = 1; \/\/ indicative only\n\n document.querySelectorAll('[data-group=\"redundancy\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"redundancy\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n redundancy = btn.dataset.val;\n calc();\n });\n });\n\n document.querySelectorAll('[data-group=\"profile\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"profile\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n profile = btn.dataset.val;\n calc();\n });\n });\n\n document.querySelectorAll('[data-preset]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n $('ratio').value = btn.dataset.preset;\n document.querySelectorAll('[data-preset]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n $('ratioVal').textContent = btn.dataset.preset + '%';\n calc();\n });\n });\n\n function wireRange(rangeId, labelId, suffix){\n const r = $(rangeId);\n r.addEventListener('input', ()=>{\n $(labelId).textContent = r.value + (suffix || '');\n document.querySelectorAll('[data-preset]').forEach(b=>{\n b.classList.toggle('active', b.dataset.preset === r.value);\n });\n calc();\n });\n }\n wireRange('hosts','hostsVal');\n wireRange('ratio','ratioVal','%');\n\n ['dramSize','nvmeSize'].forEach(id=>{\n $(id).addEventListener('change', calc);\n });\n\n function fmtGB(gb){\n if(gb >= 1024) return (gb\/1024).toFixed(2) + ' TB';\n return gb.toFixed(0) + ' GB';\n }\n\n function calc(){\n const hosts = parseInt($('hosts').value);\n const dramGB = parseInt($('dramSize').value);\n const ratioPct = parseInt($('ratio').value);\n const nvmeDeviceTB = parseFloat($('nvmeSize').value);\n\n const nvmeTierGB_raw = dramGB * (ratioPct\/100);\n const maxPartitionGB = MAX_PARTITION_TB * 1024;\n const capped = nvmeTierGB_raw > maxPartitionGB;\n const nvmeTierGB = Math.min(nvmeTierGB_raw, maxPartitionGB);\n\n const totalPerHost = dramGB + nvmeTierGB;\n const clusterTotal = totalPerHost * hosts;\n const clusterDram = dramGB * hosts;\n\n \/\/ devices needed per host\n let devicesPerHost;\n if(redundancy === 'none'){\n devicesPerHost = 1; \/\/ VCF currently mounts only a single device per host (no aggregation)\n } else {\n devicesPerHost = 2; \/\/ RAID-1 or software mirror both need 2 identical\/larger devices\n }\n const deviceCoversNeed = (nvmeDeviceTB*1024) >= nvmeTierGB;\n\n \/\/ render\n $('totalOut').innerHTML = fmtGB(totalPerHost).replace(' ', '<span>') + '<\/span>';\n \/\/ fix: simpler formatting\n const totalParts = fmtGB(totalPerHost).split(' ');\n $('totalOut').innerHTML = totalParts[0] + '<span>' + totalParts[1] + '<\/span>';\n\n const gainPct = ((totalPerHost\/dramGB - 1)*100).toFixed(0);\n $('ratioOut').textContent = '+' + gainPct + '% vs. DRAM only';\n\n $('dramOut').textContent = fmtGB(dramGB);\n $('nvmeOut').textContent = fmtGB(nvmeTierGB) + (capped ? ' (capped)' : '');\n $('clusterOut').textContent = fmtGB(clusterTotal);\n $('devicesOut').textContent = devicesPerHost + 'x ' + nvmeDeviceTB + 'TB';\n\n const pctDram = (dramGB\/totalPerHost)*100;\n const pctNvme = 100-pctDram;\n $('stackBar').innerHTML =\n '<div class=\"seg dram\" style=\"width:'+pctDram+'%\"><\/div>' +\n '<div class=\"seg nvme\" style=\"width:'+pctNvme+'%\"><\/div>';\n\n \/\/ TCO estimate (indicative only)\n const rawNvmeGBNeeded = devicesPerHost * nvmeDeviceTB * 1024;\n const costDramOnly = (totalPerHost * hosts) * DRAM_COST_PER_GB;\n const costTiered = (clusterDram * DRAM_COST_PER_GB) + (rawNvmeGBNeeded * hosts * NVME_COST_PER_GB);\n const savingsPct = Math.max(0, ((costDramOnly-costTiered)\/costDramOnly)*100).toFixed(0);\n $('tcoNote').textContent = 'Indicative TCO: reaching ' + fmtGB(totalPerHost) + '\/host with DRAM alone vs. this tiered setup could be roughly ' + savingsPct + '% cheaper on memory hardware cost (using ~$' + DRAM_COST_PER_GB + '\/GB DRAM vs. ~$' + NVME_COST_PER_GB + '\/GB NVMe as rough public reference prices \u2014 validate against your actual procurement quotes).';\n\n let policyMsg = 'Mem.TierNVMePct = ' + ratioPct + '%. Default and general best practice is 100% (1:1). ';\n if(profile === 'vdi'){\n policyMsg += 'For VDI, ratios up to 200% are commonly used since desktop workloads carry a large share of cold\/inactive memory.';\n } else if(profile === 'perf'){\n policyMsg += 'For latency-sensitive or performance-critical workloads, keep the ratio low (or disable tiering per-VM) \u2014 tiering is not supported for FT VMs, low-latency VMs, SEV\/SGX\/TDX security VMs, monster VMs (\u22651TB RAM \/ 128 vCPU), vGPU VMs, and nested VMs.';\n } else {\n policyMsg += 'Tiering typically only engages once host DRAM (Tier 0) usage reaches roughly 60\u201370%; below that, memory stays on DRAM to protect performance and NVMe endurance.';\n }\n $('policyNote').textContent = policyMsg;\n\n const warnEl = $('warnNote');\n if(redundancy === 'none'){\n warnEl.style.display = 'block';\n warnEl.textContent = 'No redundancy selected: if the single NVMe tier device fails, Tier 1 memory is lost. 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