Start/notes.ini Parameters/Create_R85_Log

Create_R85_Log

Profile

Parameter
Create_R85_Log
Category
Transaction log (log format upgrade)
Available since
At least 9.0.1 (HCL documentation)
GUI equivalent
notes.ini only (no GUI)
Possible values
1 = enable · not set / 0 = off
Default
Not set

Description

According to HCL product documentation:
You can set a NOTES.INI parameter to upgrade the format of new transaction logs. The format is useful if the Domino® server has a disk block size different from 512 bytes. Upgraded logs created at server startup will have properly aligned blocks for i/o.
Set the following parameter in the NOTES.INI file on the server: Create_R85_Log=1
With Create_R85_Log=1, the Domino server creates new transaction logs in the format from version 8.5 onwards (Notes/Domino R8.5 = Lotus Notes/Domino 8.5). This format is particularly useful when the server runs on a storage system with a disk block size other than 512 bytes (e.g. modern Advanced Format disks with 4 KB) — then the I/O blocks of the new log format align correctly with the physical storage blocks and avoid read-modify-write operations.

Procedure (HCL)

  1. Set parameter: Create_R85_Log=1
  1. Stop the Domino server
  1. Delete the contents of the transaction log directory (otherwise no new logs will be created)
  1. Restart the server
On the next start, the transaction logs are created in the new format.

Example configuration

Create_R85_Log=1

Notes & pitfalls

  • Risk of data loss: Before deleting the log directory, take a complete backup of all databases — otherwise non-logged transactions are lost.
  • Takes effect only on server start, not during operation.
  • Useful on modern storage systems (Advanced Format, NVMe) with a native block size ≠ 512 bytes.
  • After a successful migration, the parameter can be removed again — the format is preserved.

Sources (HCL Product Documentation)