Help with Vinum disk crash...

[Greg 'groggy' Lehey]

On Friday, 20 February 2004 at  9:22:21 +1100, Tony Frank wrote:
> Hi,
>
> On Thu, Feb 19, 2004 at 09:46:35AM +0100, Danny Carroll wrote:
>> Thanks for the information...  I really need the space now so I am going to wipe
>> it and start from scratch, although I am not sure if I will use vinum again.
>>
>> I guess my main concern is that when one of my disks crashed, the ufs filesystem
>> got corrupted and I really did not expect that to happen.
>>
>> It could be ignorance on my part, I dont know but perhaps someone can help me
>> understand how this could have happened?
>
> Filesystems can get corrupted if the system crashes and does not cleanly close the
> filesystem first.
> In your case I'm personally not too sure - some more questions perhaps can help.

The kind of corruption caused by an unclean shutdown is nothing like
this.

> - Were you using softupdates on the filesystem?

This shouldn't make any difference.

> - Did the system panic/reboot when the disk crashed without shutting down cleanly?
> - What version of FreeBSD are you / were you running?

>> Another thing, Greg, you mentioned that I should have a second plex if I wanted
>> to protect the data.  You mean like a mirror?  Surely 1 is enough when we are
>> talking raid-5?
>
> Raid-5 should still work if a single subdisk fails.
> In your original post you did not indicate if you were using raid5 setup.

Yes, he did:

V data                  State: up       Plexes:       1 Size:        320 GB  
P data.p0            R5 State: degraded Subdisks:     4 Size:        320 GB
S data.p0.s0            State: stale    PO:        0  B Size:        106 GB
S data.p0.s1            State: up       PO:     3924 kB Size:        106 GB
S data.p0.s2            State: up       PO:     7848 kB Size:        106 GB
S data.p0.s3            State: up       PO:       11 MB Size:        106 GB

The "R5" on the plex line indicates that it's RAID-5.

Greg
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