Re: Does btrfs "raid1" actually provide any resilience?

2013-11-14 Thread George Mitchell
On 11/14/2013 09:35 AM, Lutz Vieweg wrote: On 11/14/2013 06:18 PM, George Mitchell wrote: The read only mount issue is by design. It is intended to make sure you know exactly what is going on before you proceed. Hmmm... but will a server be able to continue its operation (including writes) o

RE: Does btrfs "raid1" actually provide any resilience?

2013-11-14 Thread Kyle Gates
On 11/14/2013 11:35 AM, Lutz Vieweg wrote: > > On 11/14/2013 06:18 PM, George Mitchell wrote: >> The read only mount issue is by design. It is intended to make sure you >> know exactly what is going >> on before you proceed. > > Hmmm... but will a server be able to continue its operation (inclu

Re: Does btrfs "raid1" actually provide any resilience?

2013-11-14 Thread Goffredo Baroncelli
On 2013-11-14 12:02, Lutz Vieweg wrote: > Hi, > > on a server that so far uses an MD RAID1 with XFS on it we wanted > to try btrfs, instead. > > But even the most basic check for btrfs actually providing > resilience against one of the physical storage devices failing > yields a "does not work" r

Re: Does btrfs "raid1" actually provide any resilience?

2013-11-14 Thread Lutz Vieweg
On 11/14/2013 06:18 PM, George Mitchell wrote: The read only mount issue is by design. It is intended to make sure you know exactly what is going on before you proceed. Hmmm... but will a server be able to continue its operation (including writes) on an already mounted btrfs when a storage d

Re: Does btrfs "raid1" actually provide any resilience?

2013-11-14 Thread George Mitchell
The read only mount issue is by design. It is intended to make sure you know exactly what is going on before you proceed. For example, a drive may actually be fine, but may have been caused by a cable failure. In that case you would want to fix the cable problem before you break the mirror b