Calendar synchronization, booking bursts and application builds. Time the job and identify CPU, storage or external-service waits before replacing hardware.
Imports, processing and simultaneous users.Cal.com-Hardwareanforderungen: RAM, CPU, Speicher und Planungs-Backend und PostgreSQL
Plane RAM, CPU, persistenten Speicher und Service-Abhängigkeiten für Cal.com mit einer workload-basierten Dimensionierung von ZimaOS, Backups und praktischen Hardware-Empfehlungen.
Cal.com hardware requirements at a glance
The former public calcom/cal.com repository now resolves to Cal.diy. This guide concerns that self-hosted community scheduling code, not a managed Cal.com subscription.
- RAM
- No universal numerical whole-host baseline is specified in the reviewed deployment source. Size the full stack during the busy operation described below.
- CPU
- No universal numerical whole-host baseline is specified in the reviewed deployment source. Measure CPU use during realistic activity.
- Storage
- PostgreSQL, application secrets and integration configuration; protect OAuth recovery material.
- Required services
- PostgreSQL and the current community application's documented mail, URL and integration configuration.
- Main sizing variable
- Calendar synchronization, booking bursts and application builds.
- Practical Zima starting point
- ZimaBoard 2 832 with SSD-backed active state is an editorial starting point for modest use. Include the OS and all companion services; it is not a measured capacity guarantee.
From official requirements to the right setup
Plan the complete Cal.com workload before selecting a server.
-
Official requirements
Choose the exact edition, stable release and supported container/runtime. PostgreSQL and the current community application's documented mail, URL and integration configuration.
-
Confirm your needs
Test a representative busy operation: Calendar synchronization, booking bursts and application builds. Record peak resident memory, CPU, disk latency and completion time, including other containers.
-
Leave room to grow
Place active state on reliable persistent storage. PostgreSQL, application secrets and integration configuration; protect OAuth recovery material. Budget working space for an upgrade or import and test recovery before relying on the deployment.
-
Run it on ZimaOS
On ZimaOS, use a compatible amd64 container through Custom Install and reproduce all required services, volume mappings and device access. Confirm the edition and repository before deployment; a large Node build-heap setting is not a runtime minimum.
Check every playback client
- Exact edition and stable release
- Compatible amd64 image/runtime
- All required companion services
- Realistic peak activity
- Persistent data and file ownership
- Free host ports and reachable URLs
- Working space and backup retention
- Successful database/file restore
Official minimum requirements
Reviewed October 30, 2026 against the linked upstream deployment documentation. Numerical values retain their stated minimum, recommendation or example scope; select release-compatible instructions before installation.
Use the requirements and scope above as a starting point, then validate Cal.com under its real workload. Application examples, build-time settings and per-container limits are not interchangeable with a whole-server minimum.
| Requirement | Official minimum | What this supports |
|---|---|---|
| RAM guidance | No universal numerical whole-host baseline is specified in the reviewed deployment source. Size the full stack during the busy operation described below. | Official guidance keeps its original test, recommendation or example scope. |
| CPU guidance | No universal numerical whole-host baseline is specified in the reviewed deployment source. Measure CPU use during realistic activity. | Core counts do not predict a fixed user, device or document capacity. |
| Storage planning | PostgreSQL, application secrets and integration configuration; protect OAuth recovery material. | Installation space is separate from retained content, working files and backups. |
| Service topology | PostgreSQL and the current community application's documented mail, URL and integration configuration. | Include every stateful companion service in the host budget. |
| Persistent state | PostgreSQL, application secrets and integration configuration; protect OAuth recovery material. | An image rebuild or container replacement is not a backup. |
| Deployment boundary | Confirm the edition and repository before deployment; a large Node build-heap setting is not a runtime minimum. | Check the linked project instructions for the selected edition and release. |
When to upgrade your hardware
Use observed Cal.com workload pressure to decide when an upgrade is warranted.
Busy operations exceed the available window
The complete stack runs short of memory
Persistent data approaches available capacity
Inspect the application and each required service for OOM events, sustained swap or growing queues. Reduce unnecessary concurrency before adding capacity.
Shared hosts and background work.PostgreSQL, application secrets and integration configuration; protect OAuth recovery material. Track primary state and backup retention separately.
Long-lived installations and growing collections.Plan hardware growth with confidence
Address storage, memory, compute and deployment limits separately.
Use suitable active storage
Put latency-sensitive application/database state on durable local SSD storage and keep recoverable copies.
SATA or PCIe SSD according to measured data growth.Add memory for the complete stack
Choose a higher-RAM host when peak application and companion-service usage leaves inadequate OS headroom.
ZimaBoard 2 832 or ZimaBoard 2 1664 according to the measured constraint.Separate capacity from compute
A multi-drive system helps when retained content and backup storage are the problem; it is not automatically a faster application.
ZimaCube 2 when a broader multi-drive workload justifies it.Fix the observed bottleneck
Confirm the edition and repository before deployment; a large Node build-heap setting is not a runtime minimum.
Check service configuration, I/O and network behavior before selecting a stronger CPU.Can it run on ZimaOS?
A matching current entry was not found in the reviewed official ZimaOS store source. Treat this as a Custom Install candidate and verify the selected upstream image, required services and host access.
Custom install Cal.com in ZimaOS
PostgreSQL and the current community application's documented mail, URL and integration configuration. Persist: PostgreSQL, application secrets and integration configuration; protect OAuth recovery material.
Custom install Cal.com in the ZimaOS app ↗Use the official Cal.com deployment instructions
Keep the selected stable release, persistent paths and companion services aligned with upstream documentation.
Review Cal.com official installation ↗Check workload-specific deployment details
Confirm the edition and repository before deployment; a large Node build-heap setting is not a runtime minimum.
Review Cal.com deployment details ↗Which Zima hardware fits Cal.com?
Start with the lowest reasonable host for the actual workload. Product specifications were checked against the current product pages.
Which workload best matches your Cal.com deployment?
Modest Cal.com deployment
Start with durable active data and a measured whole-stack memory budget.
- Workload optionZimaBoard 2 832
Heavier jobs or more companion applications
Choose added memory or compute only when observed peaks justify the change.
- Workload optionZimaBoard 2 1664
These are practical workload recommendations, not official app requirements, compatibility certification, measured capacity limits or performance guarantees. Include all co-hosted services and independent backups.
| Zima hardware | Best for | Example workload | Core configuration | Recommended boundary | Next step |
|---|---|---|---|---|---|
| ZimaBoard 2 832 | Modest Cal.com workload | Calendar synchronization, booking bursts and application builds. |
|
This is an editorial host choice, not an official app minimum or a guaranteed user/device capacity. | Get Now |
| ZimaBoard 2 1664 | More processing or shared-service headroom | PostgreSQL and the current community application's documented mail, URL and integration configuration. |
|
Size the combined stack and active working set; more RAM does not fix remote API limits or missing dependencies. | Get Now |
What the Press Says
Highlights from trusted reviewers worldwide.
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Avaliação ZimaBoard 2
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Frequently asked questions
Answers to Cal.com RAM, CPU, storage, Docker, database and ZimaOS sizing questions.
How much RAM should I plan for Cal.com?
No universal numerical whole-host baseline is specified in the reviewed deployment source. Size the full stack during the busy operation described below. Include ZimaOS, the application and its companion services rather than reserving the entire machine for one container.
What drives the CPU requirement?
No universal numerical whole-host baseline is specified in the reviewed deployment source. Measure CPU use during realistic activity. The workload to test is: Calendar synchronization, booking bursts and application builds.
Which data must survive a container update?
PostgreSQL, application secrets and integration configuration; protect OAuth recovery material. Preserve a consistent database/file set and verify that your recovery procedure restores a working application.
What other services belong in the budget?
PostgreSQL and the current community application's documented mail, URL and integration configuration.
Does this workload need a dedicated GPU?
A dedicated GPU is not assumed for the core workflow described here. Optional AI, acceleration or media-processing integrations must be evaluated separately against the selected backend.
Can I deploy it on ZimaOS?
Use an amd64 container and the current upstream service topology through Custom Install when a suitable maintained image is available. Container availability alone is not a compatibility certification.
What should I check before upgrading hardware?
Confirm the edition and repository before deployment; a large Node build-heap setting is not a runtime minimum. Compare CPU saturation, memory pressure, disk latency and external-service waits during the same reproducible operation.
Which Zima device is a practical starting point?
ZimaBoard 2 832 is the editorial starting point for this modest deployment. Choose ZimaBoard 2 1664 for measured memory/processing pressure or broader shared services; retained data determines storage expansion.
What sources informed this Cal.com hardware guide?
This guide was reviewed against the linked project deployment documentation on October 30, 2026. Zima device choices are editorial workload guidance, separate from upstream requirements and measured performance.
