[linux-lvm] Re: [PATCH] 64 bit scsi read/write
Alan Cox
alan at lxorguk.ukuu.org.uk
Sat Jul 14 08:45:44 UTC 2001
> If, after a power outage, the IDE disk can keep going for long enough
> to write its write cache out to the reserved vendor area (which will
> only take 20-30 milliseconds) then the data may be considered *safe*
> as soon as it hits writecache.
Hohohoho.
> In which case it is perfectly legitimate and sensible for the drive
> to ignore flush commands, and to ack data as soon as it hits cache.
Since the flushing commands are 'optional' it can legitimately ignore them
> If I'm right then the only open question is: which disks do and
> do not do the right thing when the lights go out.
As far as I can tell none of them at least in the IDE world
Alan
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