[cs615asa] How to read data from device

[Yifang Yuan]

Because we backup the data by tar, I suppose we can use tar -xf /dev/sdf to read

> On May 16, 2018, at 18:39, Hongkun Zhang <hzhang69 at stevens.edu> wrote:
> 
> Following question, I use cat /dev/sdf command and see the file name which I back up use dd.  Is that mean successful backup? Thanks. 
> 
> Zhitao Chen <zchen69 at stevens.edu <mailto:zchen69 at stevens.edu>>于2018年5月16日 周三15:33写道：
> I tried this, but it cannot see anything, it just let me input anything endless
> 
> On Wed, May 16, 2018 at 6:27 PM, Zhengkai Wei <zwei11 at stevens.edu <mailto:zwei11 at stevens.edu>> wrote:
> I dont know how to read original data but 
> using cat /dev/sdf can see something.
> 
> > 在 2018年5月16日，下午6:22，Zhitao Chen <zchen69 at stevens.edu <mailto:zchen69 at stevens.edu>> 写道：
> > 
> > Hi,
> > 
> > Is anyone know to read data from device? I use dd(1) to try to read the data, e.g.
> > 
> > # dd if=/dev/xbd3a | od -l 
> > 
> > but it just print 0's
> > 
> > Then I tried to create a new volume and wrote some data to it, but it also print 0's
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