Darya.zelenina: Created page with "'''FAST_PATH_PORTS''' is a static system parameter that deactivates Fast Path for specific drivers on Alpha and Integrity servers. FAST_PATH_POR..."

2019-04-09T06:07:52Z

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'''FAST_PATH_PORTS''' is a static [[System Parameters|system parameter]] that deactivates Fast Path for specific drivers on [[Alpha]] and [[Integrity]] servers.

FAST_PATH_PORTS is a 32-bit mask, with a bit assigned for each Fast Path port driver:

{| class="wikitable"
! colspan="col" | Bit value
! colspan="col" | Description
|-
| 1
| Indicates that Fast Path is disabled for ports serviced by the corresponding driver.
|-
| 0
| Indicates that Fast Path is not disabled for ports serviced by the corresponding driver.
|}

Beginning in OpenVMS Version 7.3-1, values of specific bit positions are those described in the following table:

{| class="wikitable"
! colspan="col" | Bit position
! colspan="col" | Description
|-
| 0
| Controls Fast Path for PKQDRIVER (for parallel SCSI).
|-
| 1
| Controls Fast Path for FGEDRIVER (for Emulex LP7000, LP8000, LP9002, LP9802, LP10000 FibreChannel).
|-
| 2
| Controls Fast Path for PKADRIVER (for Adaptec AIC-78xx Ultra3 SCSI).
|-
| 3
| Controls Fast Path for PEDRIVER (for LAN).
|-
| 4
| Controls Fast Path for PKRDRIVER (for SMART Array 5300).
|-
| 5
| Controls Fast Path for PKMDRIVER, the LSI Logic LSI53C1030 SCSI port driver.
|-
| 6
| Controls Fast Path for PGQDRIVER, the Qlogic ISP23xx FibreChannel port driver.
|}

Currently, the default setting for FAST_PATH_PORTS is 0, which means that Fast Path is enabled for all drivers that appear in the table.

In addition, note the following:

*[[CI]] drivers are not controlled by FAST_PATH_PORTS. Fast Path for CI is enabled and disabled exclusively by the [[FAST_PATH]] system parameter.
* FAST_PATH_PORTS is relevant only if the [[FAST_PATH]] system parameter is enabled (equal to 1). Setting FAST_PATH to zero has the same effect as setting all the bits in FAST_PATH_PORTS to 1.

=See also=
* [[FAST_PATH]]
* {{Template:IO}}

[[Category:System Parameters]]

FAST PATH PORTS - Revision history

Darya.zelenina: Created page with "'''FAST_PATH_PORTS''' is a static system parameter that deactivates Fast Path for specific drivers on Alpha and Integrity servers. FAST_PATH_POR..."