Date: Tue, 14 Sep 2010 21:15:16 +0300 From: Toomas Aas <toomas.aas@raad.tartu.ee> To: questions@freebsd.org Subject: Is it safe to run gjournal on aac-based system (BIO_FLUSH)? Message-ID: <20100914211516.92195onu24td4z4s@webmail.raad.tartu.ee>
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Hello! I'm planning to install FreeBSD 8.1 on a system which has Adaptec 4805SAS RAID controller (using aac driver). I'd like to use gjournal for the data partition, but I have some doubts regarding the (lack of) BIO_FLUSH feature. I have another system with FreeBSD 7.3 and a different aac-based controller where I've been using gjournal for 3 years. Every time the system boots, it prints this warning: GEOM_JOURNAL: BIO_FLUSH not supported by aacd1s2. I understand that lack of BIO_FLUSH support means that data cannot be safely flushed to disk and that might cause corruption in case of sudden power loss. Is that correct? Anyway, since this system has battery-backed write cache, I'm not too worried. But on the system where I'm about to install now, the controller doesn't have a battery for its cache. Hence my question - does the aac driver on FreeBSD 8.1 still not support BIO_FLUSH? If so, I should probably avoid using gmirror on this system? -- Toomas Aas
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