Chris Wedgwood wrote:
> > In the power+disk failure case, there is a very narrow window in which
> > parity may be incorrect, so loss of the disk may result in inability to
> > correctly restore the lost data.
>
> For some people, this very narrow window may still be a problem.
> Especially when you consider the case of a disk failing because of a
> power surge -- which also kills a drive.
>
> > This may affect data which was not being written at the time of the
> > crash. Only raid 5 is affected.
>
> Long term -- if you journal to something outside the RAID5 array (ie.
> to raid-1 protected log disks) then you should be safe against this
> type of failure?
>
> -cw
wow, really good idea to journal to a RAID1 array !
do you think it is possible to to the following:
- N disks holding a soft RAID5 array.
- reserve a small partition on at least 2 disks of the array to hold a RAID1
array.
- keep the journal on this partition.
do you think that this will be possible ?
is ext3 / reiserfs capable of keeping the journal on a different partition
than
the one holding the FS ?
That would really be great !
Benno.
