enabling write cacheing (was: WAPBL and write cacheing)

Is there a sysctl knob or similar that will cause the kernel to issue the
SCSI commands to enable write cacheing on a disc?

Follow-Ups:
- Re: enabling write cacheing (was: WAPBL and write cacheing)
  - From: Michael van Elst
- Re: enabling write cacheing (was: WAPBL and write cacheing)
  - From: Brian Buhrow

References:
- SATA write performance problems (on HP MicroServer)
  - From: Edgar Fuß
- Re: SATA write performance problems (on HP MicroServer)
  - From: Michael van Elst
- Re: SATA write performance problems (on HP MicroServer)
  - From: Edgar Fuß
- Re: SATA write performance problems (on HP MicroServer)
  - From: Michael L. Hitch
- Re: SATA write performance problems (on HP MicroServer)
  - From: Andy Ruhl
- WAPBL and write cacheing (was: SATA write performance problems)
  - From: Edgar Fuß
- Re: WAPBL and write cacheing
  - From: Edgar Fuß
- Re: WAPBL and write cacheing
  - From: Edgar Fuß
- Re: WAPBL and write cacheing
  - From: Greg Troxel

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