FreeBSD 5.3+ Vinum or Gvinum

[John Pettitt]

Nick Pavlica wrote:

>Andrea,
>  I have started testing with gstripe and have had good results to
>this point.  I'm still a little unclear about how to make my stripe
>persistent after a reboot?  My server consists of three drives.  A
>40GB drive that has the operating system and two 200Gb drives that I'm
>using for the raid 0 volume.  I was also curious about a couple of
>other things.
>  
>
If you made the stripe using something like

gstripe label -v -s somenumber data /dev/mumble1 /dev/mumble2

then it will be persistent subject to gstripe being loaded in the kernel
- use gstripe load or build a kernel with "options         GEOM_STRIPE "

You see something like

GEOM_STRIPE: Device data2 created (id=889964967).
GEOM_STRIPE: Disk da0 attached to data2.
GEOM_LABEL: Label for provider da1 is ufs/data.
GEOM_STRIPE: Disk da2 attached to data2.
GEOM_STRIPE: Device data2 activated.

In the boot messages (device names will vary - I'm using two 300GB USB
drives)

>- There is a .snap directory on the volume.  Is this used by gstripe?  
>  
>
Nope that's a ufs2 thing

>- I used newfs -O 2 to create a UFS2 file system on the volume.  Is
>this treated like any other UFS2 volume that can utilize fsck, etc?
>  
>
Yes - although you might want to specify a block size as the defaults
tend to assume lots of small files which is not always the case for very
large stripe sets.

>- How resiliant is this volume if the system were to crash?
>  
>
The same as any other volume except that you have twice the chance of a
hard drive failure which would be fatal to the volume.

>--Thanks!
>Nick
>
>  
>

>On Tue, 15 Mar 2005 23:48:39 +0100, Andrea Venturoli <ml at netfence.it> wrote:
>  
>
>>Nick Pavlica wrote:
>>    
>>
>>>All,
>>>  I would like to set up a raid 0 volume on my 5.3 server using two
>>>identical SATA drives.    After reading through a number of documents
>>>I noticed that there are two related utilities to do this, Vinum and
>>>Gvinum.  Which utility should be used?  It's my understanding that
>>>Gvinum is the most current and should be used on 5.3+?  Does the
>>>hadbook refer to Vinum, Gvinum or both?
>>>      
>>>
>>I'd reccomend you none of them; look here for detailed reasons:
>>http://people.freebsd.org/~rse/mirror/.
>>In brief, I've experienced severe panics with vinum after an upgrade
>>from 5.2.1 to 5.3 and gvinum is marked as alpha software and poorly
>>documented.
>>I'm quite happy with gmirror now, which the tutorial above describes.
>>You would use gstripe instead.
>>
>>  bye
>>        av.
>>
>>    
>>
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>  
>