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? > - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
