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Output from prtvtoc

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Operating Systems Solaris Output from prtvtoc
# 1  
Old 10-12-2008
Output from prtvtoc
Hi All,

when i run the command prtvtoc the output shows

38309 cylinders
38307 accessible cylinders

as per my undertanding the 1st cylinder is used for storing the vtoc , how about the second cylinder ? where its used and for what purpose?

Thanks
# 2  
Old 10-12-2008
is it x86 or sparc?
# 3  
Old 10-12-2008
Sparc ultra 10 workstation
# 4  
Old 10-12-2008
hmmm, this should be an ide drive. maybe the lost cylinder is in the layout of the ide disk. or maybe the are errors on the disk and the cylinder is "blacklisted".
# 5  
Old 10-12-2008
how do i find if its ide or scsi
i run the

Quote:
prtdiag |grep ide
and got below as output

Quote:
0 PCI-1 33 3 ide-pci1095,646
its mean its ide ? correct ?
# 6  
Old 10-12-2008
You can find with command :
# cfgadm -al
# 7  
Old 10-12-2008
Those extra 2 cylinders are reserved for "revectoring" and maybe for "diskware". Revectoring is when theres a bad spot of the disk a sector becomes unusable. The drive can reallocate a "spare". Disk drives have little computers in them and their software might be firmware in a chip, or it might be stored on the disk. Disk drive engineers actually call this "diskware".

The vtoc uses a user accessible cylinder. Think about that... If it was wasn't user accessible, prtvtoc could not display it.
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