Object Storage · ASC Docs

What it is

Object storage is the durable home for model weights, training data, checkpoints, datasets and logs. Four tiers — hot (single-digit-ms first byte, primary workloads), warm (cheaper, ~50 ms first byte), cold (minutes to first byte, infrequent access), archive (restore in hours). Same API across tiers; lifecycle policies move objects automatically.

When to use it

Store model weights — pair with Fast Weight Loader for sub-second model loads.
Checkpoint training jobs every N steps; cheap to keep history in cold tier.
Receive presigned uploads from end users.

Quickstart

asc storage create my-bucket --region apac --tier hot
asc storage upload my-bucket ./checkpoint.safetensors
asc storage presign my-bucket/checkpoint.safetensors --expires 1h

bucket = client.storage.create_bucket('my-bucket', region='apac', tier='hot')
client.storage.upload('my-bucket', 'checkpoint.safetensors', open('./checkpoint.safetensors', 'rb'))
url = client.storage.presign('my-bucket', 'checkpoint.safetensors', expires_in=3600)

await client.storage.createBucket('my-bucket', { region: 'apac', tier: 'hot' });
await client.storage.upload('my-bucket', 'checkpoint.safetensors', stream);
const url = await client.storage.presign('my-bucket', 'checkpoint.safetensors', { expiresIn: 3600 });

Limits & quotas

Limit	Default	Burst	Notes
Buckets per project	1,000	10,000	Lift via sales
Max object size	5 TiB	—	Multipart upload required above 5 GiB
Hot read throughput	100 Gbps / bucket	—	Per-region
Egress to Atlas compute (same region)	Free	—
Egress to internet	$0.045/GB	—	See pricing

Pricing

See pricing. Pay-as-you-go, billed monthly via Stripe.

API surface

PUT /v1/storage/{bucket} — create
PUT /v1/storage/{bucket}/{key} — upload
GET /v1/storage/{bucket}/{key} — read
POST /v1/storage/{bucket}/{key}/presign — presigned URL
POST /v1/storage/{bucket}/lifecycle — set tiering policy

Required scope(s): storage:read, storage:write. See Scopes.

Security

All access is authenticated and scoped. See Auth & scopes and Network controls.