All read and write operation for volume data is O(1) disk seek. However, there are fast, slow, and remote storages. Since data that are hot, warm, and cold, it would be cost-efficient to place data accordingly. SeaweedFS supports tiered storage, where you can place data to customizable disk types, and provides ways to move data to different tiers.
=> NVME => SATA SSD => Fast HDD => Slow HDD => Cloud
=> Critical => Hot => Less Hot => Warm => Cold
Speed up volume index
To write any data, the volume index needs to append one entry. To read any data, the volume index lookup is required. The volume index can be in memory mode or an LevelDB instance. The amount of index content is small while it is accessed frequently.
You can run weed volume -dir.idx=/fast/disk/dir or weed server -volume.dir.idx=/fast/disk/dir to ensure the volume index is located on a fast disk, e.g., a fast SSD mount.
If the volume server already has some existing data, you can just stop the volume server, move the .idx files to the index folder, and restart the volume server.
SSD & HDD Volume Disk Types
If the volume data also needs fast access, you can create them on fast disks.
For example, one volume server can have two disks with two kinds of disk types:
weed volume -max=10000 -disk=hdd,ssd -port=8080 -dir=/large_data,/fast_data -compactionMBps=40 -minFreeSpacePercent=7
Please notice the -disk=hdd,ssd and -dir=/large_data,/fast_data.
Then you can create with fs.configure a path specific setting and set buckets/collections that start with (example) "ssd_" to be allocated to the ssd, and all other collection will be created on the hdd. you can also create specific bucket name.
Example (within the weed shell):
fs.configure -locationPrefix=/buckets/ssd_ -disk=ssd -apply
https://github.com/seaweedfs/seaweedfs/wiki/Path-Specific-Configuration
Custom Tags
Custom Tags are supported for the disk types. Besides the default hdd and ssd, you can use any lower-cased tags, such as ssd1, hdd2, nvme, raid6, etc.
Same as the default disk types, you can place the data by custom disk types.
fs.configure -locationPrefix=/buckets/fast_ -disk=nvme -apply
You can also schedule admin scripts to move volumes from one tier to another tier. See below about volume.tier.move.
Change Volume Disk Type
When volume.balance or volume.fix.replication, the volume disk type would not change.
Change by volume.tier.move
volume.tier.move in weed shell can be used to change the disk type for one whole collection.
volume.tier.move -fromDiskType=hdd -toDiskType=ssd -quietFor=1s -fullPercent=0.001 -collection=benchmark -force
Alter replication settings of moved volumes
the -toReplication feature can be used to alter the replication settings for the newly moved volumes via the volume.tier.move command.
volume.tier.move -fromDiskType=hdd -toDiskType=ssd -quietFor=1s -fullPercent=0.001 -collection=benchmark -toReplication 100 -force
Change by volume.move
volume.move in weed shell can be used to move across volume servers:
volume.move -source <source volume server host:port> -target <target volume server host:port> -volumeId <volume id> -disk [hdd|ssd|<tag>]
Manually move volume files
For now, if you only want to change the disk type of a volume, and the volume server is not running, you can simply move the volume data from ssd directory to hdd directory, or vice versa.
Introduction
API
Configuration
- Replication
- Store file with a Time To Live
- Failover Master Server
- Erasure coding for warm storage
- Server Startup Setup
- Environment Variables
Filer
- Filer Setup
- Directories and Files
- Data Structure for Large Files
- Filer Data Encryption
- Filer Commands and Operations
- Filer JWT Use
Filer Stores
- Filer Cassandra Setup
- Filer Redis Setup
- Super Large Directories
- Path-Specific Filer Store
- Choosing a Filer Store
- Customize Filer Store
Advanced Filer Configurations
- Migrate to Filer Store
- Add New Filer Store
- Filer Store Replication
- Filer Active Active cross cluster continuous synchronization
- Filer as a Key-Large-Value Store
- Path Specific Configuration
- Filer Change Data Capture
FUSE Mount
WebDAV
Cloud Drive
- Cloud Drive Benefits
- Cloud Drive Architecture
- Configure Remote Storage
- Mount Remote Storage
- Cache Remote Storage
- Cloud Drive Quick Setup
- Gateway to Remote Object Storage
AWS S3 API
- Amazon S3 API
- AWS CLI with SeaweedFS
- s3cmd with SeaweedFS
- rclone with SeaweedFS
- restic with SeaweedFS
- nodejs with Seaweed S3
- S3 API Benchmark
- S3 API FAQ
- S3 Bucket Quota
- S3 API Audit log
- S3 Nginx Proxy
AWS IAM
Machine Learning
HDFS
- Hadoop Compatible File System
- run Spark on SeaweedFS
- run HBase on SeaweedFS
- run Presto on SeaweedFS
- Hadoop Benchmark
- HDFS via S3 connector
Replication and Backup
- Async Replication to another Filer [Deprecated]
- Async Backup
- Async Filer Metadata Backup
- Async Replication to Cloud [Deprecated]
- Kubernetes Backups and Recovery with K8up
Messaging
Use Cases
Operations
Advanced
- Large File Handling
- Optimization
- Volume Management
- Tiered Storage
- Cloud Tier
- Cloud Monitoring
- Load Command Line Options from a file
- SRV Service Discovery