On 2008-Sep-26 23:44:17 -0700, Jeremy Chadwick <[EMAIL PROTECTED]> wrote: >On Fri, Sep 26, 2008 at 10:35:57PM -0700, Derek Kuli??ski wrote: >> As far as I know (at least ideally, when write caching is disabled) ... >FreeBSD atacontrol does not let you toggle such features (although "cap" >will show you if feature is available and if it's enabled or not).
True but it can be disabled via the loader tunable hw.ata.wc (at least in theory - apparently some drives don't obey the cache disable command to make them look better in benchmarks). >Users using SCSI will most definitely have the ability to disable >said feature (either via SCSI BIOS or via camcontrol). Soft-updates plus write caching isn't an issue with tagged queueing (which is standard for SCSI) because the critical point for soft-updates is knowing when the data is written to non-volatile storage - which tagged queuing provides. -- Peter Jeremy Please excuse any delays as the result of my ISP's inability to implement an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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