[Novalug] need dd help

[John Franklin]

No, I meant vmstat.  I'm used to running it as "vmstat 1" to the point that I don't even think of the plain mode.

$ vmstat 1
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa
 0  0  13704 286276  36920 160212    0    2    51    37   52   84  1  0 98  1
 0  0  13704 286268  36920 160212    0    0     0     4   26   44  0  0 100  0
 0  0  13704 286268  36920 160212    0    0     0     0   21   37  0  0 100  0
 0  0  13704 286268  36920 160212    0    0     0     0   25   43  0  0 100  0
 0  0  13704 286268  36920 160212    0    0     0     0   22   39  0  0 100  0
 0  0  13704 286268  36920 160212    0    0     0     0   35   51  0  0 100  0
 0  0  13704 286268  36920 160212    0    0     0     0   40   63  0  0 100  0
 0  0  13704 285888  36920 160440    0    0   228     0   69   97  1  0 98  1
 0  0  13704 285888  36920 160440    0    0     0     0   68   77  0  0 100  0
 0  1  13704 224136  96568 160436    0    0 59648     0  276  450  0  8 16 76
 0  1  13704 128656 189496 160424    0    0 92928     0  397  564  0 13  0 87
 0  1  13704  91456 225592 160408    0    0 36096     0  169  292  0  7  0 93
 0  1  13704  31192 284220 160440    0    0 58624    28  267  474  0 12  0 88
 0  1  13704   7660 320844 146380    0    0 61952     0  317  489  1 17  0 82
 1  1  13704   7796 351828 122248    0    0 70912     0  382  669  0  6  0 94
 0  1  13704   7428 354388 122100    0    0 68608     8  371  630  0  7  0 93
 0  1  13704   7672 356436 121332    0    0 59648     0  330  578  0  6  0 94
 0  0  13704   9080 358360 120448    0    0 68224     0  384  655  0  7 12 81
 0  0  13704   9088 358360 120468    0    0     0     0   24   41  0  0 100  0
 0  0  13704   9088 358360 120468    0    0     0     0   22   39  0  0 100  0


You can tell when I started a dd if=/dev/sda of=/dev/null bs=1M. I'm able to do about 100MB/s read on this drive when nothing else is butting in.  Doing the same should show how fast Jay is writing to his disks and from that calculate the time to zero the disk.

jf

On Feb 13, 2012, at 6:33 PM, Nino R. Pereira wrote:

> 
>> at the end of the day, those who really want to make sure their data
>> is safe just do the equivalent of ripley's "nuke it from abort" (
>> http://www.imdb.com/title/tt0090605/quotes?qt=qt0536681 ) by throwing
>> the entire drive in the shredder.  for instance google admits freely
>> they shred their disks:
>> 
>> http://www.datacenterknowledge.com/archives/2011/04/22/video-googles-data-center-security/
>> 
>> and i have no doubt that the CIA and friends do this and possibly more
>> afterwards.
> I find this such a pity: there are really nice parts inside, in 
> particular the magnets
> that move the read heads back and forth deserve to be re-used. The older
> the drive and the more heads it has, the larger the magnets. They may be too
> dangerous for use on your refrigerator since they can smash your fingers.
> 
> The disks themselves make great mirrors, but I assume that if you 
> really, really
> try hard you could get some info from them, so you must shred those if you
> want to make sure.
> 
> Nino
> 
> 
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-- 
John Franklin
franklin at elfie.org
ICBM: 39º 01' 58.4"N 77º 24' 49.6"W Z+84m

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