vSAN Capacity 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 --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 .badge{font-family:'IBM 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footer{margin-top:22px;text-align:center;font-size:11.5px;color:var(--muted);}\n footer a{color:var(--muted);}\n\n<\/style>\n<\/head>\n<body>\n\n<div class=\"wrap\">\n\n <div class=\"grid\">\n\n \n <div class=\"panel\">\n <h2>Architecture & Cluster<\/h2>\n <div class=\"field\">\n <label>Architecture<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"arch\" data-val=\"OSA\" class=\"active\">OSA<\/button>\n <button data-group=\"arch\" data-val=\"ESA\">ESA<\/button>\n <\/div>\n <\/div>\n <div class=\"field\">\n <label>Hosts in cluster <span class=\"val\" id=\"hostsVal\">4<\/span><\/label>\n <input type=\"range\" id=\"hosts\" min=\"3\" max=\"16\" value=\"4\" step=\"1\">\n <\/div>\n <div class=\"field\" id=\"osaFields\">\n <label>Disk groups \/ host <span class=\"val\" id=\"dgVal\">2<\/span><\/label>\n <input type=\"range\" id=\"diskGroups\" min=\"1\" max=\"5\" value=\"2\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Capacity disks \/ disk group <span class=\"val\" id=\"cdVal\">4<\/span><\/label>\n <input type=\"range\" id=\"capDisks\" min=\"1\" max=\"7\" value=\"4\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Disk size<\/label>\n <select id=\"osaDiskSize\">\n <option value=\"0.96\">960 GB SSD\/NVMe<\/option>\n <option value=\"1.92\" selected>1.92 TB SSD\/NVMe<\/option>\n <option value=\"3.84\">3.84 TB SSD\/NVMe<\/option>\n <option value=\"7.68\">7.68 TB SSD\/NVMe<\/option>\n <option value=\"15.36\">15.36 TB SSD\/NVMe<\/option>\n <option value=\"1000h\">1 TB HDD (hybrid)<\/option>\n <option value=\"2000h\">2 TB HDD (hybrid)<\/option>\n <option value=\"4000h\">4 TB HDD (hybrid)<\/option>\n <\/select>\n <\/div>\n <div class=\"field\" id=\"esaFields\" style=\"display:none;\">\n <label>NVMe devices \/ host <span class=\"val\" id=\"nvVal\">6<\/span><\/label>\n <input type=\"range\" id=\"nvmeCount\" min=\"4\" max=\"24\" value=\"6\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Device size<\/label>\n <select id=\"esaDiskSize\">\n <option value=\"1.92\">1.92 TB NVMe<\/option>\n <option value=\"3.84\" selected>3.84 TB NVMe<\/option>\n <option value=\"7.68\">7.68 TB NVMe<\/option>\n <option value=\"15.36\">15.36 TB NVMe<\/option>\n <option value=\"30.72\">30.72 TB NVMe<\/option>\n <\/select>\n <\/div>\n <\/div>\n\n \n <div class=\"panel\">\n <h2>Protection & Efficiency<\/h2>\n <div class=\"field\">\n <label>Protection Policy<\/label>\n <select id=\"policy\">\n <option value=\"raid1-ftt1\">RAID-1, FTT=1 (Mirror, 2x)<\/option>\n <option value=\"raid1-ftt2\">RAID-1, FTT=2 (3x)<\/option>\n <option value=\"raid5-ftt1\" selected>RAID-5, FTT=1 (3+1, \u22654 hosts)<\/option>\n <option value=\"raid6-ftt2\">RAID-6, FTT=2 (4+2, \u22656 hosts)<\/option>\n <option value=\"adaptive-raid5\">Adaptive RAID-5 (2+1 \u2194 4+1, ESA)<\/option>\n <\/select>\n <\/div>\n <div class=\"field\">\n <label>Dedup + Compression<\/label>\n <select id=\"efficiency\">\n <option value=\"1\">1:1 (disabled)<\/option>\n <option value=\"1.25\">1.25:1 (light)<\/option>\n <option value=\"1.5\" selected>1.5:1 (typical)<\/option>\n <option value=\"2\">2:1 (good)<\/option>\n <option value=\"2.5\">2.5:1 (very good)<\/option>\n <option value=\"3\">3:1 (excellent)<\/option>\n <\/select>\n <\/div>\n\n <div class=\"divider\"><\/div>\n\n <div class=\"checkline\">\n <div>\n <div class=\"lbl\">Operations Reserve<\/div>\n <div class=\"sub\">Headroom for resync\/rebalance (~5%)<\/div>\n <\/div>\n <div class=\"switch on\" id=\"swOR\"><\/div>\n <\/div>\n <div class=\"checkline\">\n <div>\n <div class=\"lbl\">Host Rebuild Reserve<\/div>\n <div class=\"sub\">Reserves \u2248 1 host for failure rebuild (~1\/N)<\/div>\n <\/div>\n <div class=\"switch on\" id=\"swHRR\"><\/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\">Usable capacity<\/div>\n <div class=\"num\" id=\"usableOut\">0<span>TB<\/span><\/div>\n <\/div>\n <div class=\"ratio\" id=\"ratioOut\">0% of raw<\/div>\n <\/div>\n\n <div class=\"stack\" id=\"stackBar\"><\/div>\n <div class=\"legend\">\n <span><span class=\"dot\" style=\"background:var(--good)\"><\/span>Usable<\/span>\n <span><span class=\"dot\" style=\"background:var(--accent)\"><\/span>RAID-Overhead<\/span>\n <span><span class=\"dot\" style=\"background:var(--warn)\"><\/span>Reserve<\/span>\n <\/div>\n\n <div class=\"breakdown\">\n <div class=\"bd-item\"><div class=\"k\">Raw capacity<\/div><div class=\"v\" id=\"rawOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Reserve<\/div><div class=\"v\" id=\"reserveOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">RAID factor<\/div><div class=\"v\" id=\"raidOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Effective (D&C)<\/div><div class=\"v\" id=\"effOut\">\u2013<\/div><\/div>\n <\/div>\n\n <div class=\"note\" id=\"policyNote\"><\/div>\n <\/div>\n\n <\/div>\n\n <footer>\u00a9 irgNET \u2014 All calculations run in your browser; no data is transmitted. Figures are estimates; always validate against the official VMware vSAN ReadyNode Sizer before procurement.<\/footer>\n<\/div>\n\n<script>\n(function(){\n const $ = id => document.getElementById(id);\n let arch = 'OSA';\n\n \/\/ --- toggle buttons (architecture) ---\n document.querySelectorAll('[data-group=\"arch\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"arch\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n arch = btn.dataset.val;\n $('osaFields').style.display = arch === 'OSA' ? 'block' : 'none';\n $('esaFields').style.display = arch === 'ESA' ? 'block' : 'none';\n calc();\n });\n });\n\n \/\/ --- switches ---\n function wireSwitch(id){\n const el = $(id);\n el.addEventListener('click', ()=>{ el.classList.toggle('on'); calc(); });\n }\n wireSwitch('swOR');\n wireSwitch('swHRR');\n\n \/\/ --- ranges with live labels ---\n function wireRange(rangeId, labelId, fmt){\n const r = $(rangeId);\n r.addEventListener('input', ()=>{\n $(labelId).textContent = fmt ? fmt(r.value) : r.value;\n calc();\n });\n }\n wireRange('hosts','hostsVal');\n wireRange('diskGroups','dgVal');\n wireRange('capDisks','cdVal');\n wireRange('nvmeCount','nvVal');\n\n ['osaDiskSize','esaDiskSize','policy','efficiency'].forEach(id=>{\n $(id).addEventListener('change', calc);\n });\n\n function diskSizeTB(val){\n if(val.endsWith('h')) return parseInt(val)\/1000; \/\/ hybrid HDD entries stored as e.g. \"1000h\" MB->TB approx (GB actually)\n return parseFloat(val);\n }\n\n \/\/ RAID efficiency = usable fraction of the space AFTER dedup, i.e. divide-by factor\n function raidProfile(policy, hosts){\n switch(policy){\n case 'raid1-ftt1': return {factor:2.0, label:'RAID-1 FTT=1 (mirror, 2x)', minHosts:3};\n case 'raid1-ftt2': return {factor:3.0, label:'RAID-1 FTT=2 (3x)', minHosts:5};\n case 'raid5-ftt1': return {factor: hosts>=4 ? (4\/3) : 2.0, label: hosts>=4 ? 'RAID-5 FTT=1 (3+1)' : 'not enough hosts \u2013 fallback RAID-1', minHosts:4};\n case 'raid6-ftt2': return {factor: hosts>=6 ? 1.5 : (hosts>=4 ? (4\/3) : 2.0), label: hosts>=6 ? 'RAID-6 FTT=2 (4+2)' : 'not enough hosts \u2013 fallback', minHosts:6};\n case 'adaptive-raid5':\n if(hosts>=6) return {factor:1.25, label:'Adaptive RAID-5: 4+1 (80%)', minHosts:4};\n return {factor:1.5, label:'Adaptive RAID-5: 2+1 (66.7%)', minHosts:4};\n default: return {factor:2.0,label:'RAID-1',minHosts:3};\n }\n }\n\n function calc(){\n const hosts = parseInt($('hosts').value);\n let raw = 0;\n\n if(arch === 'OSA'){\n const dg = parseInt($('diskGroups').value);\n const cd = parseInt($('capDisks').value);\n const sizeTB = diskSizeTB($('osaDiskSize').value);\n raw = hosts * dg * cd * sizeTB;\n } else {\n const nv = parseInt($('nvmeCount').value);\n const sizeTB = parseFloat($('esaDiskSize').value);\n raw = hosts * nv * sizeTB;\n }\n\n \/\/ Reserve\n const orOn = $('swOR').classList.contains('on');\n const hrrOn = $('swHRR').classList.contains('on');\n const orPct = orOn ? 0.05 : 0;\n const hrrPct = hrrOn ? (1\/hosts) : 0;\n const reservePct = Math.min(orPct + hrrPct, 0.5);\n const reserveTB = raw * reservePct;\n const afterReserve = raw - reserveTB;\n\n \/\/ RAID\n const policyVal = $('policy').value;\n const profile = raidProfile(policyVal, hosts);\n const afterRaid = afterReserve \/ profile.factor;\n\n \/\/ Efficiency (dedup\/compression) - multiplies usable logical capacity\n const effRatio = parseFloat($('efficiency').value);\n const usable = afterRaid * effRatio;\n\n \/\/ --- render ---\n $('usableOut').innerHTML = usable.toFixed(1) + '<span>TB<\/span>';\n $('ratioOut').textContent = ((usable\/raw)*100).toFixed(0) + '% of raw';\n $('rawOut').textContent = raw.toFixed(1) + ' TB';\n $('reserveOut').textContent = reserveTB.toFixed(1) + ' TB (' + (reservePct*100).toFixed(0) + '%)';\n $('raidOut').textContent = 'x' + profile.factor.toFixed(2);\n $('effOut').textContent = effRatio.toFixed(2) + ':1';\n\n \/\/ stack bar: show raidOverhead + reserve + usable as % of raw\n const raidOverheadTB = Math.max(afterReserve - afterRaid, 0);\n const usablePreEff = afterRaid; \/\/ pre-efficiency-gain baseline vs raw\n const pctUsable = Math.min((usablePreEff\/raw)*100, 100);\n const pctRaid = Math.min((raidOverheadTB\/raw)*100, 100-pctUsable);\n const pctReserve = Math.max(100 - pctUsable - pctRaid, 0);\n\n $('stackBar').innerHTML =\n '<div class=\"seg usable\" style=\"width:'+pctUsable+'%\"><\/div>' +\n '<div class=\"seg raid\" style=\"width:'+pctRaid+'%\"><\/div>' +\n '<div class=\"seg reserve\" style=\"width:'+pctReserve+'%\"><\/div>';\n\n $('policyNote').textContent = 'Policy: ' + profile.label + '. The efficiency gain (dedup\/compression) is applied on top of the RAID-adjusted capacity. Figures are model estimates based on publicly documented vSAN overhead formulas (Broadcom\/VMware) \u2014 use the official vSAN ReadyNode Sizer for procurement decisions.';\n }\n\n calc();\n})();\n<\/script>\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>vSAN Capacity Calculator \u2014 irgNET Architecture & Cluster Architecture OSA ESA Hosts in cluster 4 Disk groups \/ host 2 Capacity disks \/ disk group 4 Disk size 960 GB SSD\/NVMe1.92 TB SSD\/NVMe3.84 TB SSD\/NVMe7.68 TB SSD\/NVMe15.36 TB SSD\/NVMe1 TB HDD (hybrid)2 TB HDD (hybrid)4 TB HDD (hybrid) NVMe devices \/ host 6 Device size […]<\/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-14380","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>vSAN Calculator - irgNET<\/title>\n<meta name=\"description\" content=\"Calculate usable VMware vSAN capacity in seconds \u2014 no signup, runs in-browser.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/irg-net.com\/index.php\/vsan-capacity-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"vSAN Calculator - 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{"id":14380,"date":"2026-08-07T14:00:19","date_gmt":"2026-08-07T12:00:19","guid":{"rendered":"https:\/\/irg-net.com\/?page_id=14380"},"modified":"2026-08-07T14:26:56","modified_gmt":"2026-08-07T12:26:56","slug":"vsan-capacity-calculator","status":"publish","type":"page","link":"https:\/\/irg-net.com\/index.php\/vsan-capacity-calculator\/","title":{"rendered":"vSAN Calculator"},"content":{"rendered":"\n\n\n\n\n\nvSAN Capacity 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 --radius:10px;\n }\n *{box-sizing:border-box;}\n html,body{margin:0;padding:0;}\n body{\n 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span{font-size:18px;color:var(--muted);font-weight:500;margin-left:4px;}\n .headline .lbl{font-size:12.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.08em;font-family:'IBM Plex Mono',monospace;}\n .headline .ratio{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--good);text-align:right;}\n\n .stack{width:100%;height:38px;border-radius:6px;overflow:hidden;display:flex;border:1px solid var(--line);margin-bottom:14px;}\n .seg{height:100%;transition:width .4s ease;}\n .seg.usable{background:var(--good);}\n .seg.raid{background:var(--accent);}\n .seg.reserve{background:var(--warn);}\n .seg.raw{background:#D8D2C4;}\n\n .legend{display:flex;flex-wrap:wrap;gap:16px;font-size:12px;color:var(--muted);margin-bottom:20px;}\n .legend .dot{display:inline-block;width:8px;height:8px;border-radius:2px;margin-right:6px;}\n\n .breakdown{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}\n @media(max-width:700px){.breakdown{grid-template-columns:repeat(2,1fr);}}\n .bd-item{background:var(--panel-2);border:1px solid var(--line);border-radius:8px;padding:12px 14px;}\n .bd-item .k{font-size:11px;color:var(--muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:4px;}\n .bd-item .v{font-family:'IBM Plex Mono',monospace;font-size:16px;}\n\n .note{margin-top:16px;font-size:12px;color:var(--muted);line-height:1.5;border-left:2px solid var(--line);padding-left:10px;}\n\n footer{margin-top:22px;text-align:center;font-size:11.5px;color:var(--muted);}\n footer a{color:var(--muted);}\n\n<\/style>\n<\/head>\n<body>\n\n<div class=\"wrap\">\n\n <div class=\"grid\">\n\n \n <div class=\"panel\">\n <h2>Architecture & Cluster<\/h2>\n <div class=\"field\">\n <label>Architecture<\/label>\n <div class=\"toggle-row\">\n <button data-group=\"arch\" data-val=\"OSA\" class=\"active\">OSA<\/button>\n <button data-group=\"arch\" data-val=\"ESA\">ESA<\/button>\n <\/div>\n <\/div>\n <div class=\"field\">\n <label>Hosts in cluster <span class=\"val\" id=\"hostsVal\">4<\/span><\/label>\n <input type=\"range\" id=\"hosts\" min=\"3\" max=\"16\" value=\"4\" step=\"1\">\n <\/div>\n <div class=\"field\" id=\"osaFields\">\n <label>Disk groups \/ host <span class=\"val\" id=\"dgVal\">2<\/span><\/label>\n <input type=\"range\" id=\"diskGroups\" min=\"1\" max=\"5\" value=\"2\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Capacity disks \/ disk group <span class=\"val\" id=\"cdVal\">4<\/span><\/label>\n <input type=\"range\" id=\"capDisks\" min=\"1\" max=\"7\" value=\"4\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Disk size<\/label>\n <select id=\"osaDiskSize\">\n <option value=\"0.96\">960 GB SSD\/NVMe<\/option>\n <option value=\"1.92\" selected>1.92 TB SSD\/NVMe<\/option>\n <option value=\"3.84\">3.84 TB SSD\/NVMe<\/option>\n <option value=\"7.68\">7.68 TB SSD\/NVMe<\/option>\n <option value=\"15.36\">15.36 TB SSD\/NVMe<\/option>\n <option value=\"1000h\">1 TB HDD (hybrid)<\/option>\n <option value=\"2000h\">2 TB HDD (hybrid)<\/option>\n <option value=\"4000h\">4 TB HDD (hybrid)<\/option>\n <\/select>\n <\/div>\n <div class=\"field\" id=\"esaFields\" style=\"display:none;\">\n <label>NVMe devices \/ host <span class=\"val\" id=\"nvVal\">6<\/span><\/label>\n <input type=\"range\" id=\"nvmeCount\" min=\"4\" max=\"24\" value=\"6\" step=\"1\">\n <div style=\"height:10px\"><\/div>\n <label>Device size<\/label>\n <select id=\"esaDiskSize\">\n <option value=\"1.92\">1.92 TB NVMe<\/option>\n <option value=\"3.84\" selected>3.84 TB NVMe<\/option>\n <option value=\"7.68\">7.68 TB NVMe<\/option>\n <option value=\"15.36\">15.36 TB NVMe<\/option>\n <option value=\"30.72\">30.72 TB NVMe<\/option>\n <\/select>\n <\/div>\n <\/div>\n\n \n <div class=\"panel\">\n <h2>Protection & Efficiency<\/h2>\n <div class=\"field\">\n <label>Protection Policy<\/label>\n <select id=\"policy\">\n <option value=\"raid1-ftt1\">RAID-1, FTT=1 (Mirror, 2x)<\/option>\n <option value=\"raid1-ftt2\">RAID-1, FTT=2 (3x)<\/option>\n <option value=\"raid5-ftt1\" selected>RAID-5, FTT=1 (3+1, \u22654 hosts)<\/option>\n <option value=\"raid6-ftt2\">RAID-6, FTT=2 (4+2, \u22656 hosts)<\/option>\n <option value=\"adaptive-raid5\">Adaptive RAID-5 (2+1 \u2194 4+1, ESA)<\/option>\n <\/select>\n <\/div>\n <div class=\"field\">\n <label>Dedup + Compression<\/label>\n <select id=\"efficiency\">\n <option value=\"1\">1:1 (disabled)<\/option>\n <option value=\"1.25\">1.25:1 (light)<\/option>\n <option value=\"1.5\" selected>1.5:1 (typical)<\/option>\n <option value=\"2\">2:1 (good)<\/option>\n <option value=\"2.5\">2.5:1 (very good)<\/option>\n <option value=\"3\">3:1 (excellent)<\/option>\n <\/select>\n <\/div>\n\n <div class=\"divider\"><\/div>\n\n <div class=\"checkline\">\n <div>\n <div class=\"lbl\">Operations Reserve<\/div>\n <div class=\"sub\">Headroom for resync\/rebalance (~5%)<\/div>\n <\/div>\n <div class=\"switch on\" id=\"swOR\"><\/div>\n <\/div>\n <div class=\"checkline\">\n <div>\n <div class=\"lbl\">Host Rebuild Reserve<\/div>\n <div class=\"sub\">Reserves \u2248 1 host for failure rebuild (~1\/N)<\/div>\n <\/div>\n <div class=\"switch on\" id=\"swHRR\"><\/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\">Usable capacity<\/div>\n <div class=\"num\" id=\"usableOut\">0<span>TB<\/span><\/div>\n <\/div>\n <div class=\"ratio\" id=\"ratioOut\">0% of raw<\/div>\n <\/div>\n\n <div class=\"stack\" id=\"stackBar\"><\/div>\n <div class=\"legend\">\n <span><span class=\"dot\" style=\"background:var(--good)\"><\/span>Usable<\/span>\n <span><span class=\"dot\" style=\"background:var(--accent)\"><\/span>RAID-Overhead<\/span>\n <span><span class=\"dot\" style=\"background:var(--warn)\"><\/span>Reserve<\/span>\n <\/div>\n\n <div class=\"breakdown\">\n <div class=\"bd-item\"><div class=\"k\">Raw capacity<\/div><div class=\"v\" id=\"rawOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Reserve<\/div><div class=\"v\" id=\"reserveOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">RAID factor<\/div><div class=\"v\" id=\"raidOut\">\u2013<\/div><\/div>\n <div class=\"bd-item\"><div class=\"k\">Effective (D&C)<\/div><div class=\"v\" id=\"effOut\">\u2013<\/div><\/div>\n <\/div>\n\n <div class=\"note\" id=\"policyNote\"><\/div>\n <\/div>\n\n <\/div>\n\n <footer>\u00a9 irgNET \u2014 All calculations run in your browser; no data is transmitted. Figures are estimates; always validate against the official VMware vSAN ReadyNode Sizer before procurement.<\/footer>\n<\/div>\n\n<script>\n(function(){\n const $ = id => document.getElementById(id);\n let arch = 'OSA';\n\n \/\/ --- toggle buttons (architecture) ---\n document.querySelectorAll('[data-group=\"arch\"]').forEach(btn=>{\n btn.addEventListener('click', ()=>{\n document.querySelectorAll('[data-group=\"arch\"]').forEach(b=>b.classList.remove('active'));\n btn.classList.add('active');\n arch = btn.dataset.val;\n $('osaFields').style.display = arch === 'OSA' ? 'block' : 'none';\n $('esaFields').style.display = arch === 'ESA' ? 'block' : 'none';\n calc();\n });\n });\n\n \/\/ --- switches ---\n function wireSwitch(id){\n const el = $(id);\n el.addEventListener('click', ()=>{ el.classList.toggle('on'); calc(); });\n }\n wireSwitch('swOR');\n wireSwitch('swHRR');\n\n \/\/ --- ranges with live labels ---\n function wireRange(rangeId, labelId, fmt){\n const r = $(rangeId);\n r.addEventListener('input', ()=>{\n $(labelId).textContent = fmt ? fmt(r.value) : r.value;\n calc();\n });\n }\n wireRange('hosts','hostsVal');\n wireRange('diskGroups','dgVal');\n wireRange('capDisks','cdVal');\n wireRange('nvmeCount','nvVal');\n\n ['osaDiskSize','esaDiskSize','policy','efficiency'].forEach(id=>{\n $(id).addEventListener('change', calc);\n });\n\n function diskSizeTB(val){\n if(val.endsWith('h')) return parseInt(val)\/1000; \/\/ hybrid HDD entries stored as e.g. \"1000h\" MB->TB approx (GB actually)\n return parseFloat(val);\n }\n\n \/\/ RAID efficiency = usable fraction of the space AFTER dedup, i.e. divide-by factor\n function raidProfile(policy, hosts){\n switch(policy){\n case 'raid1-ftt1': return {factor:2.0, label:'RAID-1 FTT=1 (mirror, 2x)', minHosts:3};\n case 'raid1-ftt2': return {factor:3.0, label:'RAID-1 FTT=2 (3x)', minHosts:5};\n case 'raid5-ftt1': return {factor: hosts>=4 ? (4\/3) : 2.0, label: hosts>=4 ? 'RAID-5 FTT=1 (3+1)' : 'not enough hosts \u2013 fallback RAID-1', minHosts:4};\n case 'raid6-ftt2': return {factor: hosts>=6 ? 1.5 : (hosts>=4 ? (4\/3) : 2.0), label: hosts>=6 ? 'RAID-6 FTT=2 (4+2)' : 'not enough hosts \u2013 fallback', minHosts:6};\n case 'adaptive-raid5':\n if(hosts>=6) return {factor:1.25, label:'Adaptive RAID-5: 4+1 (80%)', minHosts:4};\n return {factor:1.5, label:'Adaptive RAID-5: 2+1 (66.7%)', minHosts:4};\n default: return {factor:2.0,label:'RAID-1',minHosts:3};\n }\n }\n\n function calc(){\n const hosts = parseInt($('hosts').value);\n let raw = 0;\n\n if(arch === 'OSA'){\n const dg = parseInt($('diskGroups').value);\n const cd = parseInt($('capDisks').value);\n const sizeTB = diskSizeTB($('osaDiskSize').value);\n raw = hosts * dg * cd * sizeTB;\n } else {\n const nv = parseInt($('nvmeCount').value);\n const sizeTB = parseFloat($('esaDiskSize').value);\n raw = hosts * nv * sizeTB;\n }\n\n \/\/ Reserve\n const orOn = $('swOR').classList.contains('on');\n const hrrOn = $('swHRR').classList.contains('on');\n const orPct = orOn ? 0.05 : 0;\n const hrrPct = hrrOn ? (1\/hosts) : 0;\n const reservePct = Math.min(orPct + hrrPct, 0.5);\n const reserveTB = raw * reservePct;\n const afterReserve = raw - reserveTB;\n\n \/\/ RAID\n const policyVal = $('policy').value;\n const profile = raidProfile(policyVal, hosts);\n const afterRaid = afterReserve \/ profile.factor;\n\n \/\/ Efficiency (dedup\/compression) - multiplies usable logical capacity\n const effRatio = parseFloat($('efficiency').value);\n const usable = afterRaid * effRatio;\n\n \/\/ --- render ---\n $('usableOut').innerHTML = usable.toFixed(1) + '<span>TB<\/span>';\n $('ratioOut').textContent = ((usable\/raw)*100).toFixed(0) + '% of raw';\n $('rawOut').textContent = raw.toFixed(1) + ' TB';\n $('reserveOut').textContent = reserveTB.toFixed(1) + ' TB (' + (reservePct*100).toFixed(0) + '%)';\n $('raidOut').textContent = 'x' + profile.factor.toFixed(2);\n $('effOut').textContent = effRatio.toFixed(2) + ':1';\n\n \/\/ stack bar: show raidOverhead + reserve + usable as % of raw\n const raidOverheadTB = Math.max(afterReserve - afterRaid, 0);\n const usablePreEff = afterRaid; \/\/ pre-efficiency-gain baseline vs raw\n const pctUsable = Math.min((usablePreEff\/raw)*100, 100);\n const pctRaid = Math.min((raidOverheadTB\/raw)*100, 100-pctUsable);\n const pctReserve = Math.max(100 - pctUsable - pctRaid, 0);\n\n $('stackBar').innerHTML =\n '<div class=\"seg usable\" style=\"width:'+pctUsable+'%\"><\/div>' +\n '<div class=\"seg raid\" style=\"width:'+pctRaid+'%\"><\/div>' +\n '<div class=\"seg reserve\" style=\"width:'+pctReserve+'%\"><\/div>';\n\n $('policyNote').textContent = 'Policy: ' + profile.label + '. The efficiency gain (dedup\/compression) is applied on top of the RAID-adjusted capacity. Figures are model estimates based on publicly documented vSAN overhead formulas (Broadcom\/VMware) \u2014 use the official vSAN ReadyNode Sizer for procurement decisions.';\n }\n\n calc();\n})();\n<\/script>\n<\/body>\n<\/html>\n\n","protected":false},"excerpt":{"rendered":"<p>vSAN Capacity Calculator \u2014 irgNET Architecture & Cluster Architecture OSA ESA Hosts in cluster 4 Disk groups \/ host 2 Capacity disks \/ disk group 4 Disk size 960 GB SSD\/NVMe1.92 TB SSD\/NVMe3.84 TB SSD\/NVMe7.68 TB SSD\/NVMe15.36 TB SSD\/NVMe1 TB HDD (hybrid)2 TB HDD (hybrid)4 TB HDD (hybrid) NVMe devices \/ host 6 Device size […]<\/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-14380","page","type-page","status-publish","hentry"],"yoast_head":"\n<title>vSAN Calculator - irgNET<\/title>\n<meta name=\"description\" content=\"Calculate usable VMware vSAN capacity in seconds \u2014 no signup, runs in-browser.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/irg-net.com\/index.php\/vsan-capacity-calculator\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"vSAN Calculator - 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