Re: Got a call at 4am - RAID Gurus Please Read

[Rob Seastrom <rs () seastrom com>]

+1 on both.  Mostly SmartOS, some FreeNAS (which is FreeBSD underneath).

-r

Ryan Brooks <ryan () hack net> writes:

> Zfs on BSD or a Solaris like OS
>
>
> > On Dec 11, 2014, at 10:06 AM, Bacon Zombie <baconzombie () gmail com> wrote:
> >
> > Are you running ZFS and RAIDZ on Linux or BSD?
> > > On 10 Dec 2014 23:21, "Javier J" <javier () advancedmachines us> wrote:
> > >
> > > I'm just going to chime in here since I recently had to deal with bit-rot
> > > affecting a 6TB linux raid5 setup using mdadm (6x 1TB disks)
> > >
> > > We couldn't rebuild because of 5 URE sectors on one of the other disks in
> > > the array after a power / ups issue rebooted our storage box.
> > >
> > > We are now using ZFS RAIDZ and the question I ask myself is, why wasn't I
> > > using ZFS years ago?
> > >
> > > +1 for ZFS and RAIDZ
> > >
> > >
> > >
> > > > On Wed, Dec 10, 2014 at 8:40 AM, Rob Seastrom <rs () seastrom com> wrote:
> > > >
> > > >
> > > > The subject is drifting a bit but I'm going with the flow here:
> > > >
> > > > Seth Mos <seth.mos () dds nl> writes:
> > > >
> > > > > Raid10 is the only valid raid format these days. With the disks as big
> > > > > as they get these days it's possible for silent corruption.
> > > >
> > > > How do you detect it?  A man with two watches is never sure what time it
> > > > is.
> > > >
> > > > Unless you have a filesystem that detects and corrects silent
> > > > corruption, you're still hosed, you just don't know it yet.  RAID10
> > > > between the disks in and of itself doesn't help.
> > > >
> > > > > And with 4TB+ disks that is a real thing.  Raid 6 is ok, if you accept
> > > > > rebuilds that take a week, literally. Although the rebuild rate on our
> > > > > 11 disk raid 6 SSD array (2TB) is less then a day.
> > > >
> > > > I did a rebuild on a RAIDZ2 vdev recently (made out of 4tb WD reds).
> > > > It took nowhere near a day let alone a week.  Theoretically takes 8-11
> > > > hours if the vdev is completely full, proportionately less if it's
> > > > not, and I was at about 2/3 in use.
> > > >
> > > > -r