Compute Engine Storage - Local SSD
Local SSDs physically attached to HOST SERVER of VM Instance.
Data Encryption
- Compute Engine automatically encrypts your data when it is written to local SSD
- Local SSDs cannot use encryption keys (CMEK or CSEK)
Machine Types
- Only few machine types support Local SSDs
Performance
- Provides very high IOPS and low latency
- Higher throughput (10x – 100x faster when compared to PDs)
- Performance depends on which interface you select
- RECOMMENDED to use SCSI and NVMe interfaces
- Use a NVMe-enabled or multi-queue SCSI VM images for better performance
Data Persistence
- Data persists only until instance is running
- When VM Instance is deleted, Local SSDs will get deleted.
- Enable live migration for data to survive regular maintenance events
- You CANNOT detach and attach it to another VM Instance
When compared to PDs
- Local SSDs will have lower durability, lower availability and lower flexibility.
Use cases
- Caching Services
- Temporary data that needs high throughput
Persistent Disk vs Local SSDs
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