Date: Fri, 21 Nov 2008 10:45:00 +0200 From: "Valentin Bud" <valentin.bud@gmail.com> To: "Wojciech Puchar" <wojtek@wojtek.tensor.gdynia.pl> Cc: questions@freebsd.org, Marcel Grandemange <thavinci@thavinci.za.net>, Tsu-Fan Cheng <tfcheng@gmail.com> Subject: Re: ZFS Recovery Tools Message-ID: <139b44430811210045k1a27cc1an7c0ea7b0cbbce1d1@mail.gmail.com> In-Reply-To: <20081121094146.P19920@wojtek.tensor.gdynia.pl> References: <02c801c94b40$4b6a2f10$e23e8d30$@za.net> <20081120204756.O16829@wojtek.tensor.gdynia.pl> <f84c38580811201255o1a207f97u8cb4078d03911fa9@mail.gmail.com> <20081120222909.K17356@wojtek.tensor.gdynia.pl> <139b44430811202326j6eafb93fgde2a55c1564da68f@mail.gmail.com> <20081121094146.P19920@wojtek.tensor.gdynia.pl>
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On Fri, Nov 21, 2008 at 10:42 AM, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> wrote: >> What does MAXPHYS mean (yes max raw I/O transfer) and do? A little >> bit more specific if you may. > > how large can be single read from disk. > > when you say read 2 files in the same time, FreeBSD will readahead at most > MAXPHYS from one file, then from file 2, from file 1 etc. > > 128kB/s is way too much for todays drives, that can read 1MB within one > access time. > Thank you for your explanation. a great day, v
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