On Linux (2.4.18, SuSE 8.1) direct access to underlying disks is done via special raw devices and some restrictions apply (RAW(8) man page):
Because raw I/O involves direct hardware access to a process's memory, a few extra restrictions must be observed. All I/Os must be correctly aligned in memory and on disk: they must start at a sector offset on disk, they must be an exact number of sectors long, and the data buffer in virtual memory must also be aligned to a multiple of the sector size. The sector size is 512 bytes for most devices.
Is raw IO supported on Linux?
-- Regards Flemming Frandsen - http://dion.swamp.dk PartyTicket.Net co founder & Yet Another Perl Hacker
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