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Re: [linux-lvm] LVM and Truecrypt



Hello Sven (and all),

I have been concerned that a failure on one of the disk controllers would result in data loss in the following way:
1. A mainboard fails that has a JOBD RAID connected
2. The mainboard is replaced and the drives from the original set are connected.
3. Because of hardware changes and/or operating system changes and/or "disk order" changes, no data can be read from the RAID.
I'd be curious to know this: if I had a JOBD under LVM and I tried to plug the disks into another PC entirely, would I be able to read the files I had on those drives?  How does LVM know which drive was where in the order of drives in the JOBD?

I am not actually worried about data loss from a drive failure.  I backup regularly (but I have never had a hard drive fail.  I attribute this partly to the temperature at which I keep my drives).  I have had several RAID controller failures (which is why I no longer consider any RAID level to be a backup).

By asking, "Is there any partuclar reason for using truecrypt?" do you mean, "Why truecrypt as opposed to any other encryption solution?"?  If so, I use truecrypt because it is opensource and has received a lot of attention from experienced cryptographers.  I wouldn't trust closed source or obscure encryption software.  On the other hand, if you were asking, "Why use encryption?", then you might be interested in Sans news bites: http://www.sans.org/newsletters/newsbites/ .  Sans covers many data leaks.

(Do you live in Scandinavia?)

Gordon

On Wed, May 6, 2009 at 5:08 PM, Sven Eschenberg <sven whgl uni-frankfurt de> wrote:
Hi Gordon,

Is there any particular Reason, why a mainboard failure should result in massive data loss?
But you can be assured, that a disk failure in such a volume will most certainly result in massive dataloss, since the filesystem spans across all disks.
Is there any partuclar reason for using truecrypt?

Regards

-Sven

Gordon Fogus schrieb:
Hello all,

I am trying to create a 10TB network share (like a NAS share, but with permission levels) on a dedicated GNU+Linux server to be used on a Linux/Windows network.

I must use truecrypt for full drive encryption. I need the disks to be independently mountable (no striping, parity bits or files spanning across physical drives) (this is because I am afraid of massive data loss from a mainboard failure.  If you can show me that this fear is unfounded and that I would definitely be able to recover my data after a mainboard failure, then I would not hesitate to use files spanning across drives). Most importantly, the combined space of the disks (10TB) must appear as 10TB on the network, not 10 @ 1TB drives (if I were using 1TB drives, for example). Resonable continuous write speed is also a factor for me.
It is essential that this drive space can be "mounted" (i.e., "mount network drive") on a Windows machine.
Different folders must be able to have different permissionn levels for different users, similar to the permission levels available in Microsoft shares (write new files/edit files/delete files/make new folders/delete folders/etc.).  After someone connects to the file server, he must not be able to access every file, only those specificly shared to him.

Can someone point me to info on using truecrypt with LVM?
(I am new to GNU+Linux.  File serving on a Windows Active Directory server is... unpredictable.)

Gordon


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read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


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