# set-ovf-reserve command

The set-ovf-reserve command in the DM
account, sets aside a specific number of frames as the spare tank
in the event that the overflow table runs out of frames. The default
is 1024 or .5% of your available disk space (maxfid), whichever is
greater. When the set-ovf-reserve command is run,
the system displays both the old and new reserve values.

Warning: It is extremely dangerous to run without
any overflow reserve. If the system runs out of frames, and there
is no overflow reserve to fall back on, there is no recourse except
to restore the system from a backup tape.

## Syntax

```
set-ovf-reserve {(reserve.quantity)} {(options}
```

## Parameter(s)

| reserve.quantity | Number of frames to set aside as reserve overflow. | |
| --- | --- | --- |
| options | q | Suppresses messages. |

## Example(s)

If your overflow reserve is set
to 200, running the command below produces the message shown:

```
set-ovf-reserve (1024)
Previous reserve: 200
New reserve: 1024
```

## See also

- [init-ovf command](https://d3codex.com/tcl/init-ovf-command/)
- [initovf command](https://d3codex.com/tcl/initovf-command/)
- [overflow command](https://d3codex.com/tcl/overflow-command/)
- [Overflow table](https://d3codex.com/definitions/overflow-table/)
- [ovf-monitor command](https://d3codex.com/tcl/ovf-monitor-command/)
- [Scrubber](https://d3codex.com/definitions/scrubber/)
- [set-ovf-local command](https://d3codex.com/tcl/set-ovf-local-command/)
- [set-runaway-limit command](https://d3codex.com/tcl/set-runaway-limit-command/)
- [user-coldstart macro](https://d3codex.com/tcl/user-coldstart-macro/)

---
Source: https://d3codex.com/tcl/set-ovf-reserve-command/ - part of the D3Codex reference.