Date: Sat, 18 Jan 2014 19:19:27 +0800 From: Erich Dollansky <erichsfreebsdlist@alogt.com> To: Warren Block <wblock@wonkity.com> Cc: paul beard <paulbeard@gmail.com>, FreeBSD Ports <ports@freebsd.org>, bart@tapolsky.net.ua Subject: Re: clonehdd followup Message-ID: <20140118191927.1910276a@X220.alogt.com> In-Reply-To: <alpine.BSF.2.00.1401171933100.4213@wonkity.com> References: <CAMtcK2rJOQz1dh9wjU5xKvTkPv%2B-U_cgzmyfbtYPF%2BpimBpKdg@mail.gmail.com> <CAMtcK2rdKdnHT1Lai8u5g5FnSZmvhBdPq_6iR_J8pjBsSJgqDQ@mail.gmail.com> <alpine.BSF.2.00.1401171933100.4213@wonkity.com>
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Hi, On Fri, 17 Jan 2014 19:36:19 -0700 (MST) Warren Block <wblock@wonkity.com> wrote: > On Fri, 17 Jan 2014, paul beard wrote: > > > Grr. The return key should not be the same as Send. > > > > I had some problems with clonehdd that turned out to be hardware > > issued: my disks has somehow defaulted to PIO4 from UDMA which made > > this process run so slow it would just quit with finishing. > > > > Now things are more what I expect, completing a clone of my root > > disk in 524 minutes, down from multiple days? > > > > But it still seems slow if the disks are 1.5Gb/sec SATA disks. > > Looking around, it looks like this might be useful to speed things > > up. > > > > > > http://www.wonkity.com/~wblock/docs/html/disksetup.html > > How? The partitioning scheme does not make any serious difference to > transfer rates. That's much more affected by the filesystem, but > even there the limits are usually due to drive and controller > hardware. > > One thing the partitioning scheme can affect is alignment. In your > other mail, this was shown to be a 500G drive, which is almost > certainly not using 4K blocks, and so alignment is not a problem. I have several 500GB drive which use 4k sectors. Erich
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