Date: Fri, 25 May 2012 11:00:56 +0100 From: Pete French <petefrench@ingresso.co.uk> To: janm@transactionware.com, petefrench@ingresso.co.uk Cc: freebsd-stable@freebsd.org Subject: Re: VirtualBox, AIO and zvol's - a cautionary tale Message-ID: <E1SXrKK-000M5Y-53@dilbert.ingresso.co.uk> In-Reply-To: <F1C457B5-0CFF-4286-95E0-C9871CA8021A@transactionware.com>
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> I have seen similar behaviour, but I did not disable AIO to solve it. Instead, in the VirtualBox VM, I made sure that the storage controller was created with the "--hostiocache on" option. Without that, the virtual machines were unreliable on ZFS with the same behaviour you saw. Interesting. I have this setting "Off" - but my machines were perfectly reliable until AIO was added to the mix. Are yours directly on top of a zvol as the underlying disc, or using files on ZFS ? Will try enabling that setting - thoigh as it is stable anyway it wont make a lot of diffeernce I hope! cheers, -pete.
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