From: Paul. Vanchope (cuihh6@HOTMAIL.COM)
Date: Thu Jan 08 2004 - 07:52:54 EST
i have an Oracle 8.1.7 database, which was not built on the filesystem but
on the raw device ( that is /dev/rlvXXXX).
And five pvs have been allocated to the database for its tablespace and
many lvs have been created on these pvs. Now i want to make an identical
copy of some of the lvs on hdisk3 to another hdisk, such as hdisk5, suppose
that hdisk3 and hdisk5 are on the same vg.
#lspv -l hdisk3
lv01029 64 64 64..00..00..00..00 N/A
lv01030 64 64 64..00..00..00..00 N/A
lv01031 64 64 64..00..00..00..00 N/A
lv01032 64 64 64..00..00..00..00 N/A
lv01033 64 64 64..00..00..00..00 N/A
lv01034 64 64 64..00..00..00..00 N/A
lv01035 64 64 64..00..00..00..00 N/A
lv01036 64 64 64..00..00..00..00 N/A
lv01037 64 64 64..00..00..00..00 N/A
the lvs i want to copy to hdisk5 are lv01029 lv01031 lv01034.
i have already created three lvs which have the same size as the original
lvs,of course the lv names are different.
#lspv -l hdisk5
b_lv01029 64 64 64..00..00..00..00 N/A
b_lv01031 64 64 64..00..00..00..00 N/A
b_lv01034 64 64 64..00..00..00..00 N/A
Now i find three ways to make an identical copy of these lvs:
1. dd if=/dev/rlv01029 of=/dev/rb_lv01029
2. dd if=/dev/lv01029 of=/dev/b_lv01029
3. suppose i did not create the 3 lvs on hdisk5 , and i use mklvopy
instead:
mklvcopy lv01029 2 hdisk5
Do All the three ways work ?
which way is the best choose ?
what is the difference between the 1st and 2nd command ?
Please give me some suggestion , thanks in advance.
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