lvm question

[Gene Heskett]

On Friday 13 April 2007, Les wrote:
>On Thu, 2007-04-12 at 17:40 -0400, Gene Heskett wrote:
>> On Thursday 12 April 2007, Ed Greshko wrote:
>> >Gene,
>> >
>> >> So I started a dd if=/dev/hda of=/dev/hdd which cloned that 160GB drive
>> >> to a 200GB drive.
>> >
>> >AFAIK, when you dd in that manner, you are cloning as you say.  In that
>> > way, you are cloning everything.  By everything I mean you are cloning
>> > the disk label, partition table, inodes and all bad bits.  In effect,
>> > you've made a 200GB drive into a 160GB drive.
>>
>> Rant mode on here Ed.
>>
>> Not permanently.  I was able to use fdisk and add a 4th partition to
>> account for the rest of the drive after I was done.  That's why I asked
>> the question about adding it to the LVM setup for real use, but no one has
>> offered any how to on that, not yet anyway.
>>
>> What I didn't understand was why it (/dev/hda3, the lvm volume) fsck'd on
>> the first couple of boots after I'd made the the clone while I was fixing
>> the partition table and usage on /dev/hdd to more or less match what was
>> in /etc/fstab, since it dropped to a shell when it couldn't find the right
>> stuff on the right partition of /dev/hdd.  There is no reason in the world
>> that can explain why I couldn't edit /etc/fstab and comment that stuff out
>> until I had a chance to get the main install fixed.  I even went so far as
>> to edit the grub line from ro to rw and it made no difference at all.  But
>> that was on /dev/hda1, which mounted just fine as rw so it was editable.
>>
>> In short, I lost some hair trying to get around that when the stuff on hdb
>> and hdd had absolutely NOTHING to do with a functioning, bootable system
>> other that I'd forgotten to clean them out of /etc/fstab before I
>> unmounted hdd, and cloned hda to it on a live system.
>>
>> There was, and is, no valid excuse for that behaviour.  What was on
>> /dev/hdd was only partitioned out of order.  That was accessory stuff that
>> could have been fixed a hell of a lot easier from a booted, working
>> system, but it turned into a cast iron bitch trying to do all that from a
>> Zod livedvd boot. Even from the dvd boot, anything on /dev/hda3 was
>> read-only without at that point, any errors being reported on screen by
>> e2fsck, none, nada, zip.  They didn't show up until I got the partitions
>> in a row on /dev/hdd and it booted past that only to upchuck over the lvm
>> on hda3.  Then, and only then did it give me the correct command line to
>> use to do an e2fsck on an lvm volume. The manpages on the dvd were
>> worthless in that regard.  The e2fsck took around 5 hours, but I napped 2
>> of them maybe.  The real fix should have taken maybe 5 minutes, to correct
>> /etc/fstab, but on a readonly disk, how the heck are you gonna do that?
>>
>> FWIW, and probably a different reason, even though the livedvd had not
>> mounted anything from /dev/hda, it still refused me write perms to do
>> anything to it. Not parted, not fdisk, nothing.  Everything claimed the
>> disk was busy.  To say that it was frustrating is an understatement of
>> classic proportions. That is what forced me to run fdisk against a live,
>> in use, drive.  But I didn't touch the existing partitions, only added
>> another, 4th primary to account for the unused 40GB of that drive.
>>
>> That should not have had any effect on the first 3 partitions, and in fact
>> I have done exactly that previously, on a 30GB drive in an amiga.  I
>> cloned a 1GB seacrate to it, rebooted to it, and then added the other
>> partitions I wanted.  The amiga, FWIW, did NOT limit the number of
>> partitions per drive by any means other than running out of system memory
>> since each mount took about 64k to hold all the tables.  There was a
>> reserved area of about 32k that could be expanded up to half a meg on an
>> amiga-os formatted hard drive that could be used for all sorts of stuff,
>> like a partition table with 10 or more entries, security passwords, custom
>> boot files etc, and anything in there was invisible and not normally
>> modifiable without getting out the disk tools. That was, IMO, one thing
>> they did do right.
>>
>> --
>> Cheers, Gene
>> "There are four boxes to be used in defense of liberty:
>>  soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author)
>> The Marines:
>> 	The few, the proud, the not very bright.
>
>I have to agree with your rant about fixing things.  I had really
>clobbered this disk with some "fixes" that I did that got out of control
>during the "yum remove" exercise, when a bunch of dependencies were
>removed along with the one file I wanted removed.... GRRRRR!
>
><rant2>
>	But the last line above about the Marines is not quite right, if you
>have seen the new gear these lads here in Pendleton drive and manage.  I
>know a few that have thought about taking their vehicles to Mr. Kerry's
>house ;-) over his version of this very comment.   Also don't forget
>that these young lads will do their very best to protect our soft
>behinds, up to and all too often including the ultimate act.   Would you
>do the same for them?
>
></rant2>

Blame that on my sig rotator.  That's certainly not my personal view.  One of 
my sons served his time in the Corp rather proudly.

When I think of Marines, I can recall back 40 some years to a drill instructor 
at Camp Pendelton, who conned his way in at 15 IIRC, and proceeded to show 
the rest of them how to shoot the issue 45.  His name was Thell Reed Jr., and 
he could have you set an empty coke can on the back of each hand he held out 
in front of him, then toss them up 2 or 3 feet, drop his hands, draw both 
45's, and put 13 holes in each coke can before they hit the ground.  The 
recoil from 26 rounds in about .7 seconds knocked him back on his butt, all 
of which made a very impressive movie although it was only about 10 seconds 
long.  And although the triggers had been slicked a bit, they weren't 
automatic, he had to pull the trigger after the slide was back in battery 
each time.  By the time they really did find out how old he was, he was old 
enough to stay in.  The American Rifleman did a spread on him in the 
mid '60's.   That BTW, is a small fraction faster than the Texas Ranger who 
could unload a double action wheel gun in about .8 seconds, but not with 
Thell's accuracy.  Either one was poetry in motion as far as handling a 
handgun was concerned.  The special effects hollywood has done in that area 
that I've seen was pure hokum, nothing at all like the real thing.

As for the last question, yes.  Not a question really, a statement.  The 
question is, would I be fast enough at my age?  Probably not, but that 
wouldn't stop me from making the reach.  Never has so far.

Funny thing though, the show was been enough to win the fight the only time I 
did it once for real and he didn't think much of having his drunken speech 
about how he was gonna do this and that interrupted by noticing a half a 
pound of a C.A. Undercover 38 stuck up his nose.  He was gone, in 
considerably less than 30 seconds...  45 years ago, haven't seen him since & 
I didn't leave.  If I'd known about the Darwin Awards then I would have 
nominated him.  But that's very old history, and a shrug today.

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Where's th' DAFFY DUCK EXHIBIT??