RAID is not a backup solution and should not be treated as one On Fri, Oct 4, 2019, 3:41 PM sven falempin <sven.falem...@gmail.com> wrote:
> On Fri, Oct 4, 2019 at 8:10 AM Nick Holland <n...@holland-consulting.net> > wrote: > > > > On 10/3/19 10:01 AM, sven falempin wrote: > > > Dear readers, > > > > > > I was running a OpenBSD (6.4) device, with a raid mirror array. > > > One of the disk failed, so the system ask me to fsck, > > > > Probably not quite that simple. More likely, the disk failed, > > that took the system down hard, and it needed an fsck on reboot. > > Which is normal, RAID or otherwise. > > > > > which I did before checking the raid status manually ( :'( ) , > > > THEN I rebooted and softraid told me: one of the hard drive is dead. > > > > > > But fsck already destroyed a few file on the mirror. > > > > that seems unlikely. that's not what fsck does -- fsck's job is to > > repair a file system. If it removes a file, the file is already > > damaged. > > > > > Probably a user error, nevertheless, In openbsd 'simply work' mindset, > > > maybe the /etc/rc could warn or even perform some bioctl check on raid > > > array when first fsck / mount > > > fails. > > > > I'm not seeing what this has to do with RAID, soft or otherwise. If your > > system needed an fsck, it needed it whether it was a simple drive or a > > RAID array. If you need an fsck, you are likely to have lost data. > > > > > ( Lost data recovered from backup ) > > > > And again...nothing to do with either fsck or RAID -- you have to have > > a backup. RAID doesn't change that. > > > > Nick. > > > > > Let me reformulate as a question, because I clearly misslead you in > thinking that fsck -p from rc would delete files or having a backup > is a bad idea. @_@ > I lose recent data with fsck -y , and use it because i have a backup, > the data loss here was massive (old untouched files). > > How to check the state of the MIRROR raid array , to detect large > amount of failures on one of the two disk ? > > Best. > > -- > -- > > --------------------------------------------------------------------------------------------------------------------- > Knowing is not enough; we must apply. Willing is not enough; we must do > >
