Disk I/O error and hfsdebug (was: Re: sqlite error:)

[Michael_google gmail_Gersten]

On Mon, Jul 12, 2010 at 2:31 PM, John Musbach <johnmusbach1 at gmail.com> wrote:
> Why was this cross posted? Relevence to mac os x?

I'm sorry. On the macports mailing list, an issue came up where a
problem turned out to be a bad hard drive. Someone pointed out that
there were SMART monitoring tools in the macports database. Checking
them on my system revealed that I also had a failing drive.

There is a "HowTo" for BSD systems that includes the use of file
system debuggers for BSD systems to identify which file contains the
bad blocks. But there doesn't seem to be an obvious tool for HFS
systems to find which file contains the bad blocks.

So, I'm asking on the Mac Os X list, and I'm asking two questions:
1. Is there a tool to determine which file owns which block?, and
2. For HFS+ file systems, what is a hot file? How can the list of hot
files be reset?

Since these are HFS+ questions, and that's a Mac Os X issue, I thought
it was appropriate for this list.

> On 7/10/10, Michael_google gmail_Gersten <keybounce at gmail.com> wrote:
>> On Fri, Jul 9, 2010 at 1:35 PM, Daniel J. Luke <dluke at geeklair.net> wrote:
>>> On Jul 9, 2010, at 4:15 PM, Michael_google gmail_Gersten wrote:
>>>> Second: How can I force a test read or write of those sectors?
>>>> (After finding out a bad sector LBA)
>>>
>>> http://smartmontools.sourceforge.net/badblockhowto.html
>>>
>>>> How can
>>>> I tell if they are allocated? (Normal HFS+, but multiple partitions.)
>>>
>>> I don't know of a tool that will do that (maybe hfsdebug can?). If you're
>>> not seeing IO errors otherwise, it's probably not in an allocated file.
>>> You could probably use dd to write to all of the empty space on each
>>> partition.
>>
>> I have looked over HFSDebug-lite 4.33, but I cannot find any way to
>> turn block numbers into file names. Am I missing that?
>>
>> Also: What is a hot file?
>>
>> $ sudo hfsdebug-lite -H -t 20
>>
>> 1         641025    2123376 Kleiman
>> HD:/Users/michael/Library/Application
>> Support/SyncServices/Local/data.version
>> 2         249345    1222833 Kleiman
>> HD:/usr/share/locale/en_US.ISO8859-1/LC_NUMERIC
>> 3         181135    1222831 Kleiman
>> HD:/usr/share/locale/en_US.ISO8859-1/LC_MESSAGES/LC_MESSAGES
>> 4         138903    1222832 Kleiman
>> HD:/usr/share/locale/en_US.ISO8859-1/LC_MONETARY
>> 5         129709     407796 Kleiman HD:/Users/leila/.CFUserTextEncoding
>>
>> 1-4 I can see as being busy files.
>> #5? That user hasn't logged in in over a year; the only place that
>> file could be being used is as an AFP/SMB mount point, but then I'd
>> expect to see everyone's .CFUserTextEncoding, and the others are not.
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