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Re: [linux-lvm] Manegeability with LVM



> On Monday, 04 March 2002, at 23:00:10 +0100,
> Anders Widman wrote:

>> As my need for diskspace increases all the time I was thinking of
>> using LVM so I could make use of all diskspace and grow/shrink/replace
>> drives as I need to.
>> 
> Take into account that there are filesystem that by design doesn't
> support shrinking of filessytems (e.g. XFS). Some others allow you to
> both grow and shrink filesystems, but sometimes you will have to unmount
> the filesystem before modifying its size.

Yes, very true. I was thinking of using reiserfs which supports at
least offline resizing/shrinking.

> On the LVM part, it was designed to allow growing and reducing LV sizes
> without being necessary to put your machine in some "maintenance" state.

>> The only downside to this is the possibility of massive dataloss if I
>> loose any of the 14 disks (drive fails to spin etc...). Would it be
>> possible to setup up a software redundancy like RAID5 with LVM so I
>> can keep this manageability LVM gives me?
>> 
> Remember, nothing except regular _and_ verified backups of your valuable
> data can guarantee that your data will survive a hardware _or_ software
> error. I'm am not sure what I fear most, a damaged disk or a severe 
> filesystem corruption. Some RAID levels give you additional hardware
> failure protection, but other levels increase your chances of lossing
> data. LVM can be seen as some sort of linear-RAID, and as such, usually
> increases the probability of a broken disk destroying your data.

> In other words, backups are (and will always be) the way to go.

True. I do agree. Right now I don't have the "economy" to buy
additional hardware so I have to do the best thing with these drives
(with the possibility to add new ones or replace old ones for bigger
drives.).

//Anders




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