Would it really be that much slower to have a journal of RAID 5 writes? On Fri, 2005-11-18 at 15:05 +0100, Jure Pečar wrote: > Hi all, > > Currently zfs is a major news in the storage area. It is very interesting to > read various details about it on varios blogs of Sun employees. Among the > more interesting I found was this: > > http://blogs.sun.com/roller/page/bonwick?entry=raid_z > > The point the guy makes is that it is impossible to atomically both write > data and update parity, which leaves a window of crash that would silently > leave on-disk data+paritiy in an inconsistent state. Then he mentions that > there are software only workarounds for that but that they are very very slow. > > It's interesting that my expirience with veritas raid5 for example is just > that: slow to the point of being unuseable. Now, I'm wondering what kind of > magic does linux md raid5 does, since its write performance is quite good? > Or, does it actually do something regarding this? :) > > Niel? >
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