Quoting guy keren, from the post of Wed, 21 Feb: > > what? what???? a mirror is as _slow_ as the _slower_ disk. an I/O > request to the mirror, gets a response only after its clones were > written into both legs of the mirror - not as soon as one was written.
I once did some benchmarks for a client and showed that even a mirror of three disks (yes, every sector written 3 times) the write time penelty was extremely small, however reading speed jumped practically in a linear fashion (i.e. a 3-disk RAID1 under linux reads 3 times as fast than a single disk). we are talking of course about three SATA drives... This is one very simple feature is oddly lacking from Micro$oft's software RAID, where you write to all disks in parallel but read from only one of them. I don't need to tell you how moronic I find this... not only the user loses performance, but that disk is going to be the first to blow a gasket, it's as problemtic as RAID4, almost. -- Tired TV producer Ira Abramov http://ira.abramov.org/email/ ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
