Date: Fri, 5 Jun 2009 12:36:41 -0500 From: David Kelly <dkelly@hiwaay.net> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: freebsd-questions <freebsd-questions@freebsd.org>, Valentin Bud <valentin.bud@gmail.com> Subject: Re: Opinion request about a file server Message-ID: <20090605173641.GB16153@Grumpy.DynDNS.org> In-Reply-To: <alpine.BSF.2.00.0906051815450.84073@wojtek.tensor.gdynia.pl> References: <139b44430906050557v4ce23a13r259535c3e839deb0@mail.gmail.com> <alpine.BSF.2.00.0906051815450.84073@wojtek.tensor.gdynia.pl>
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On Fri, Jun 05, 2009 at 06:16:49PM +0200, Wojciech Puchar wrote: > > >What i mainly try to achieve, talking in storage space, is 2 HDD of 1TB in > >mirroring using gmirror(8) and 1 separate HDD of 500Gb. > > > >So do you think the system I've mentioned would handle the load? The server > > 10 times more power than needed. disks speed is the only limit I have a P-II at 400 MHz running as a file server. See about 5 MB/sec on most file transfers. Has one of the original 15GB IBM Deskstar drives, and a much slower 6 GB WD drive. Both on ATA16 interfaces. I suspect network speed will determine the limits. A modern SATA drive should be sequentially read or write at at least 80 MB/sec. while a 100M bit/sec ethernet will be limited to 11 MB/sec. Latency of disk drive and network are usually the limiting factors, not server CPU. With gigabit ethernet one could reasonably expect to see 25MB/sec file rates. Depends a lot as to how big the file, the bigger the faster. Used smartctl just now to check, the Deskstar drive has 50331 hours of run time, 5.7 years. Has only been power cycled 72 times. Run time seems low as I have almost never turned this drive off since 2000. The WD drive claims to have 1418293 hours of uptime. Know that is not right. -- David Kelly N4HHE, dkelly@HiWAAY.net ======================================================================== Whom computers would destroy, they must first drive mad.
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