[sclug] LVM & 2Tb limit

[Alan Pearson]

On 15 Feb 2005, at 17:29, Martin Summers wrote:
{SNIPped appropriately)

>
>
> http://www.arnnet.com.au/index.php/id;403016224;fp;512;fpid;47886160
>
>>
>> this unfortunate positon (I speak from experience here !)
>
> Interesting, what FS was it ?
>
> (MS)It was ext3 - but the RAID controller only had 128MB cache, and it 
> died mid-write. I did a series of tests on transferring large and 
> small files, while simulating a power crash on a test RHEL 3.0 with 
> logical volumes. My conclusion is that you will always get a certain 
> percentage of corrupt files, depending on what was writing at the time 
> the power goes.
> It is easy to fix the filesystem, but knowing if the files are corrupt 
> (truncated) or not afterwards is not so easy....
>
>

Oh dear. We'd definitely need to know which files are corrupted.
I wonder does reiserfs give any more interesting information ?



>
>> Also, backing up a filesystem that large is going to take time......
>
> Backups, we don't need no stink'in backups !!!
> Seriously !!!
> The content is dynamic and changes regularly.
> Also, it's sitting on multiple HW Raid devices.
>
> (MS) - yes, so was ours! Power can do some nasty things (ours arc'ed 
> and fried everything in that area....I can still remember the smell of 
> smoke......)
>


Wow. Nasty nasty nasty.



> So I can take around 8 disk failures (in the right places).
>
> (MS) <nod> we took 5 at the time of our power arc...
>

Gees. Nasty and double nasty.



>>
>> I guess that's my two-penneth worth ;-)
>>
>> -Martin Summers
>
> -Martin
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