Re: [FAQ-answer] Re: soft RAID5 + journalled FS + power failure =problems ?
Hi, Chris Wedgwood writes: > > 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? Indeed. The jfs journaling layer in ext3 is a completely generic block device journaling layer which could be used for such a purpose (and raid/LVM journaling is one of the reasons it was designed this way). --Stephen
Re: [FAQ-answer] Re: soft RAID5 + journalled FS + power failure =problems ?
Hi, Benno Senoner writes: > 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. Yes. My jfs code will eventually support this. The main thing it is missing right now is the ability to journal multiple devices to a single journal: the on-disk structure is already designed with that in mind but the code does not yet support it. --Stephen
