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Date:      Thu, 31 Aug 2000 08:56:47 +0930
From:      Greg Lehey <grog@lemis.com>
To:        Holtor <holtor@yahoo.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: SCSI Write Cache & SoftUpdates
Message-ID:  <20000831085647.D34978@wantadilla.lemis.com>
In-Reply-To: <20000830144954.25294.qmail@web113.yahoomail.com>; from holtor@yahoo.com on Wed, Aug 30, 2000 at 07:49:54AM -0700
References:  <20000830144954.25294.qmail@web113.yahoomail.com>

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On Wednesday, 30 August 2000 at  7:49:54 -0700, Holtor wrote:
> --- Greg Lehey <grog@lemis.com> wrote:
>> On Tuesday, 29 August 2000 at 19:37:03 -0700, Holtor wrote:
>>> I am thinking of enabling softupdates but have read in the
>>> questions/stable mail listing archives that enabling softupdates
>>> when the scsi hard drive has write cache enabled could cause
>>> trouble that would not normally be experienced.
>>>
>>> Does anyone know if there is any truth to that? Is disabling write
>>> cache not a good idea? If anyone could offer up some suggestions,
>>> that would be beneficial.
>>
>> In general, you can't rely on disks to complete cached writes if
>> the power fails.  This doesn't have anything to do with soft
>> updates.  Soft updates will probably protect you better in this
>> situation, but if you value your data you should turn off write
>> caching.
>
> Right now my drive has write cache enabled and softupdates
> disabled. So when enabling softupdates I should disable the write
> cache. This worried me: "if you value your data you should turn of
> write caching" - Does that mean it should be off if softupdates are
> enabled or not?

Yes.

Greg
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