Gan, Jimmy
130 lines
4.0 KiB
Bash
Executable File
130 lines
4.0 KiB
Bash
Executable File
#!/bin/bash
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# Find What's in System Data (351GB)
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# System Data includes snapshots, caches, logs, VM files, etc.
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set -e
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echo "=== Find System Data Usage (351GB) ==="
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echo ""
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echo "System Data on macOS includes:"
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echo " - APFS snapshots"
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echo " - Time Machine local snapshots"
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echo " - Virtual memory swap files"
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echo " - System caches"
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echo " - Log files"
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echo " - Purgeable space"
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echo ""
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TOTAL_FOUND=0
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echo "🔍 Checking System Data Components:"
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echo ""
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# 1. Check APFS snapshots
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echo "1. APFS Snapshots:"
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APFS_SNAPS=$(diskutil apfs listSnapshots / 2>/dev/null | grep -c "Name:" || echo "0")
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echo " Found: $APFS_SNAPS snapshot(s)"
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if [ "$APFS_SNAPS" -gt 0 ]; then
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diskutil apfs listSnapshots / 2>/dev/null | grep -E "Name|Purgeable" | head -4 | sed 's/^/ /'
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fi
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echo ""
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# 2. Check Time Machine local snapshots
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echo "2. Time Machine Local Snapshots:"
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TM_SNAPS=$(tmutil listlocalsnapshots / 2>/dev/null | grep -v "Snapshots for disk" | grep -v "^$" | wc -l | tr -d ' ')
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echo " Found: $TM_SNAPS snapshot(s)"
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if [ "$TM_SNAPS" -gt 0 ]; then
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tmutil listlocalsnapshots / 2>/dev/null | grep -v "Snapshots for disk" | grep -v "^$" | sed 's/^/ - /'
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fi
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echo ""
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# 3. Check virtual memory (swap files)
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echo "3. Virtual Memory (Swap Files):"
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VM_SIZE=$(sudo du -sh /private/var/vm 2>/dev/null | awk '{print $1}' || echo "0")
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echo " /private/var/vm: $VM_SIZE"
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echo ""
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# 4. Check system caches
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echo "4. System Caches:"
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CACHE_SIZE=$(sudo du -sh /private/var/folders 2>/dev/null | awk '{print $1}' || echo "0")
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echo " /private/var/folders: $CACHE_SIZE"
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echo ""
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# 5. Check logs
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echo "5. System Logs:"
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LOG_SIZE=$(sudo du -sh /Library/Logs /private/var/log 2>/dev/null 2>/dev/null | awk '{sum+=$1} END {print sum}' || echo "0")
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echo " Logs: ~$LOG_SIZE"
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echo ""
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# 6. Check MobileBackups
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echo "6. MobileBackups (APFS Local Snapshots):"
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MB_SIZE=$(sudo du -sh /System/Volumes/Data/.MobileBackups /.MobileBackups 2>/dev/null | awk '{sum+=$1} END {print sum}' || echo "0")
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if [ "$MB_SIZE" != "0" ] && [ -n "$MB_SIZE" ]; then
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echo " MobileBackups: $MB_SIZE"
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else
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echo " MobileBackups: Not found or empty"
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fi
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echo ""
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# 7. Check /private/var
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echo "7. /private/var (System Data):"
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PVAR_SIZE=$(sudo du -sh /System/Volumes/Data/private/var 2>/dev/null | awk '{print $1}' || echo "0")
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echo " /private/var: $PVAR_SIZE"
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echo ""
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# 8. Check for sparse bundles
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echo "8. Sparse Bundles (Disk Images):"
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SPARSE_COUNT=$(sudo find /System/Volumes/Data -maxdepth 3 -name "*.sparsebundle" -o -name "*.sparseimage" 2>/dev/null | wc -l | tr -d ' ')
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echo " Found: $SPARSE_COUNT sparse bundle(s)"
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if [ "$SPARSE_COUNT" -gt 0 ]; then
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sudo find /System/Volumes/Data -maxdepth 3 -name "*.sparsebundle" -o -name "*.sparseimage" 2>/dev/null | head -5 | while read bundle; do
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SIZE=$(sudo du -sh "$bundle" 2>/dev/null | awk '{print $1}')
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echo " - $bundle ($SIZE)"
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done
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fi
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echo ""
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# 9. Check Library
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echo "9. System Library:"
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LIB_SIZE=$(sudo du -sh /System/Volumes/Data/Library 2>/dev/null | awk '{print $1}' || echo "0")
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echo " /Library: $LIB_SIZE"
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echo ""
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echo "=== Summary ==="
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echo ""
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echo "System Data is 351GB. The components above may not add up to 351GB"
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echo "because System Data also includes:"
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echo " - Purgeable space (not shown in du)"
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echo " - APFS snapshot overhead"
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echo " - Reserved space"
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echo " - Other system files"
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echo ""
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echo "🔧 To Reduce System Data:"
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echo ""
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echo "1. Delete Time Machine local snapshots:"
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if [ "$TM_SNAPS" -gt 0 ]; then
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echo " sudo tmutil deletelocalsnapshots <date>"
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else
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echo " (No snapshots found)"
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fi
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echo ""
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echo "2. Thin local snapshots:"
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echo " sudo tmutil thinlocalsnapshots / 1000000000 1"
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echo ""
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echo "3. Remove Time Machine destination (prevents new snapshots):"
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echo " System Settings → Time Machine → Remove backup disk"
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echo ""
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echo "4. Clean system caches:"
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echo " sudo rm -rf /private/var/folders/*"
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echo " (⚠️ Be careful - this may affect running apps)"
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echo ""
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echo "5. Restart your Mac:"
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echo " This often releases purgeable space and snapshots"
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echo ""
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