Table Of Content

Storage Integration with Host-based Write-back Caching Flash Memory Summit 2017 Andy Banta @andybanta NetApp SolidFire Flash Memory Summit 2017 Santa Clara, CA 1 Agenda §  Patented information §  How virtual machines use storage §  Caching methods •  And who can and needs to use them §  Single-host write-back caching integration §  High Availability write-back caching integration Flash Memory Summit 2017 Santa Clara, CA 2 Patented information • Authors: Andy Banta and Erik Cota-Robles • Wholly owned by VMware • Discovery is fully described by the patent • Not giving away any secrets here Flash Memory Summit 2017 Santa Clara, CA 3 How VMware uses storage §  Shared filesystem on block storage •  Others exist, not as interesting §  One or more LUs make up one filesystem §  Virtual disks intermixed with metadata §  Various locks to prevent or coordinate concurrent access to VMs and metadata. Flash Memory Summit 2017 Santa Clara, CA 4 VMFS layout VMFS LBA 0 META Virtual disk data META Virtual disk data DATA DATA Virtual disk data META Virtual disk data META DATA DATA Flash Memory Summit 2017 Santa Clara, CA 5 Caching with VMFS §  Hosts can’t cache metadata •  Heartbeat operations assure storage health •  Used to coordinate access among multiple hosts •  Information about usage and layout §  Hosts can cache virtual disk data •  Assuming single host access •  Assuming no underlying storage operations Flash Memory Summit 2017 Santa Clara, CA 6 Write-back vs. Write-through §  Write-through •  Write operations complete to backing storage –  Therefore no write speed up •  Provides transactional consistency –  Required in many cases §  Write-back •  Speeds up write operations •  Might cause data corruption or loss Flash Memory Summit 2017 Santa Clara, CA 7 Write-back options §  Write ordering is important •  Flushing should be in write order •  Out-of-order flush can cause corruption §  Not for all workloads •  Desktops, web servers are OK •  Databases not so much §  Can be used for crash consistency Flash Memory Summit 2017 Santa Clara, CA 8 Write ordering corruption 104 187 123 144 104 123 144 187 Flash Memory Summit 2017 Santa Clara, CA 9 Write-back pitfalls Host 1 Storage doesn’t have an up-to-date representation of written data 1 2 3 1 Flash Memory Summit 2017 Santa Clara, CA 10

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One or more LUs make up one filesystem. ▫ Virtual disks intermixed with metadata. ▫ Various locks to prevent or coordinate concurrent access to VMs
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Storage Integration with Host-based Write-back Caching Andy Banta, Storage Janitor/Virtualization PDF

37 Pages·2017·1.38 MB·English
by  Tracie Barnes
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One or more LUs make up one filesystem. ▫ Virtual disks intermixed with metadata. ▫ Various locks to prevent or coordinate concurrent access to VMs

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