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Date:      Thu, 08 Jul 2010 17:59:48 +1000
From:      Andrew Snow <andrew@modulus.org>
To:        Simun Mikecin <numisemis@yahoo.com>, freebsd-fs@freebsd.org
Subject:   Re: Freebsd 8 Release /usr Die After host VMWARE Crash
Message-ID:  <4C358574.2040009@modulus.org>
In-Reply-To: <688583.92527.qm@web112402.mail.gq1.yahoo.com>
References:  <AANLkTiknH3e0X5lu30azKWguKkgbH_-3pOLQKXinCDPs@mail.gmail.com> <AANLkTilN4EA6hYYRwbPggAdz6O6iPjA_5Em5SU8hXTlC@mail.gmail.com> <4C3563A8.7060301@modulus.org> <688583.92527.qm@web112402.mail.gq1.yahoo.com>

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On 08/07/10 17:45, Simun Mikecin wrote:
> AFAIK virtual environments ignore disk sync requests by default. For example, in
> VirtualBox they are ignored by default, by you could enable it if you want (with
> a performance penalty). Haven't used VMWare, so not 100% sure about it, maybe
> someone more knowledgable with VMWare knows what it's defaults are.

VMware vSphere/ESX/ESXi makes all writes synchronous.

(It is terribly slow on RAID cards that lack battery-backed cache!)


- Andrew



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