On 3/14/2009 8:51 PM, Marco Colombo wrote: > Stuart D. Gathman wrote: >> On Sat, 14 Mar 2009, Dietmar Maurer wrote: >> It just means that write barriers won't get passed to the device. >> This is only a problem if the devices have write caches. Note >> that with multiple devices, even a FIFO write cache could cause >> reordering between devices (one device could finish faster than another). > No, it's more than that. PostgreSQL gurus say LVM doesn't honor fsync(), > that data doesn't even get to the controller, and it doesn't matter > if the disks have write caches enabled or not. Or if they have battery backed > caches. Please read the thread I linked. If what they say it's true, > you can't use LVM for anything that needs fsync(), including mail queues > (sendmail), mail storage (imapd), as such. So I'd really like to know. Seeing as my /var (with both postfix & courier-imap using it for mail storage) has been on lvm for almost 4 years, that would be news to me... ;) -- Best regards, Charles _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
