Inode allocation question.

saudoi · 11-15-2005, 02:11 AM

When I read Solaris Test questions, I get this question and unknown which is the correct answer. Please help me:

Quote:

Question:
You use the ufsrestore command to extract the whole content of a file system (stored to tape with ufsdump) onto another file system. Which statement about inode allocation is true?

Answer:
A. The new file systems inodes are allocated successively as the files are restored, independent of the inode numbers recorded to tape.

B. ufsrestore consults the inode map in each cylinder. If an inode to be restored is already allocated, ufsrestore quits with a fail message.

C. The inodes are allocated such that the inode numbers after the restore are identical to the inode numbers recorded on tape, effectively overwriting inodes that had been allocated before the restore.

D. ufsrestore tries to allocate inode numbers for the restored files as they are recorded on tape and evades to new, unallocated inodes whenever an inode number is already allocated in the file system.

I choose A. Is it correct?

jlliagre · 11-15-2005, 02:18 AM

From LQ Rules (http://www.linuxquestions.org/rules.php):

Do not expect LQ members to do your homework - you will learn much more by doing it yourself.

jlliagre · 11-15-2005, 02:22 AM

That said, A make sense, B & C do not, and D is overkill ...

saudoi · 11-15-2005, 03:57 AM

It's not my homework, it just a test which I tried on internet. I chose A but the answer of test engine is C so i'm very confused.

jlliagre · 11-15-2005, 04:36 AM

Interesting, we already discussed this question 6 month ago:
http://www.linuxquestions.org/questi...hreadid=325645

Can you point to the Internet test ?

Anyway, C may be correct, a full restore is different from a partial one, and would perhaps explain this part of the manual pages, which still confuses me:

Quote:

A level 0 dump must be done after a full restore. Because
ufsrestore runs in user mode, it has no control over inode
allocation. This means that ufsrestore repositions the
files, although it does not change their contents. Thus, a
full dump must be done to get a new set of directories
reflecting the new file positions, so that later incremental
dumps will be correct.

saudoi · 11-15-2005, 07:00 AM

Great. I forgot that I had had the same question in the past. At this time, i didn't have Sun, just reading book to study. Now, when I get one, i continue....

I get this question from testking.com

I'm not good at English so that I don't really understand option C. As I understand, it is: "ufsrestore will overwirte the current inode numbers in destination system by the new inode numbers recorded on tape. After restore, we can see the inode numbers of files on new system are the same as files on old system."

I think it possible when we make full restore (as clone disk to disk).

Reading the question carefully and your reply "a full restore is different from a partial one", I remember to "clone disk to disk".

Perhaps, the key words in this question is "the whole content of a file system". If it's just a part of system, the inode number of file on new system will be allocated new, independent of the inode numbers recorded to tape as option A. Am I right?