# Considerations when deploying Classic vs Server Mode for BlueFuse Multi
### **Classic Mode**This architecture requires a single installation of BlueFuse Multi on each desktop computer. Classic mode does not support simultaneous read-write access for multiple users using the same database.Deploy BlueFuse Multi in classic mode for the following reasons:
* There is little contention over database access and multi-user read-write functionality is not necessary.
* To take advantage of new features in the most recent version of BlueFuse Multi using existing infrastructure.
* To upgrade to the multi-user read-write functionality in stages.
### The following figure illustrates the 3 main deployment options for a classic mode installation of BlueFuse Multi v3.0, or later.**A** Single installation of BlueFuse Multi on a desktop computer.**B** Installation of BlueFuse Multi on multiple desktop computers with the database directory shared.**C** Installation of BlueFuse Multi on multiple desktop computers with the database stored on the disk of a networked Server computer.**Server Mode**Server mode requires BlueFuse Multi installation on each desktop computer and BlueFuse Server installation on the designated centralized server computer.The BlueFuse Server software accepts incoming requests for access to the database and manages contention and locking. Deploy BlueFuse Multi in Server mode when there is contention for access to the database for multiple users.The following figure illustrates the 2 main deployment options for the server mode installation of BlueFuse Server.**A** BlueFuse Multi installed on all desktop computers and BlueFuse Server installed on the computer hosting the database files. Illumina recommends deploying server mode using this option.**B** BlueFuse Multi installed on all desktop computers, BlueFuse Server installed on a separate computer, and the directory containing the database hosted on another computer or network attached storage (NAS) device. If this option is chosen, do not use Vista or Windows 7 on the computer hosting the database directory.**Summary: Selecting a Deployment Mode\*\*\*\*New BlueFuse Multi Installation**
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| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Deployment Mode** | **Lab Description** |
| **Classic Mode** Multiple installations of BlueFuse Multi can access a database, but are limited to read-only activity. | • Likely to require ≤ 3 installations of BlueFuse Multi. |
| **Server Mode** Multiple users have read-write access to a database. Experiment reports can be viewed in a web browser. If intending to install BlueFuse Multi in Server Mode, consult institutional IT department. | • Likely to have significant contention for multiuser read-write access, or anticipate significant contention in the near future.• Has a suitable computer available to host the BlueFuse Server. If lab does not have a suitable computer but anticipates a significant number of BlueFuse Multi users, purchase a computer to host BlueFuse Server. |
**Upgrade Existing BlueFuse Multi Installation**
| | |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| **Deployment Mode** | **Lab Description** |
| **Classic Mode** Multiple installations of BlueFuse Multi can access a database, but are limited to read-only activity. | • Little contention over database access and multiuser read-write access.• No significant increase in the number of BlueFuse Multi users soon. |
| **Server Mode** Multiple users have read-write access to a database. Experiment reports can be viewed in a web browser. If intending to install BlueFuse Multi in Server Mode, consult institutional IT department. | • Significant contention for multiuser read-write access, or anticipate significant contention in the near future.• Planning to significantly increase the number of BlueFuse Multi users soon.• Has a suitable computer available to host the BlueFuse Server. |
**For additional information, see the following:**
* [BlueFuse Multi Installation Guide](https://support.illumina.com/downloads/bluefuse-multi-software-installation-guide-15053614.html)
* [BlueFuse Multi Software Support Resources Page](https://support.illumina.com/array/array_software/bluefuse-multi-software.html)
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| *For any feedback or questions regarding this article (Illumina Knowledge Article #3739), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000003739%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |
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