On Monday March 5, Dexter.Filmore@xxxxxx wrote: > http://gentoo-wiki.com/HOWTO_Gentoo_Install_on_Software_RAID#Data_Scrubbing > > "Warning: Be aware that the combination of RAID5 and loop-devices will most > likely cause severe filesystem damage, especially when using ext3 and > ReiserFS. Some users suggest that XFS is not affected by this, but this has > not been entirely confirmed. See kernel bug 6242 for updates on this bug. > > Note: There are also reports that Journaled Filesystems are problematic on all > Software-RAID levels. No kernel bugs have been submitted regarding this bug > as of yet. A number of the reports involve using cryptoloops which are known > to cause corruption. See http://forums.gentoo.org/viewtopic-t-412467.html for > more information. This thread should be taken with a grain of salt." > > Can someone shed some light on this? I have XFS on my raid and *had* problems > when unpacking large archives with many small files. > Bugs that get mentioned on wiki's but never reported to maintainers are unlikely to get fixed...... Back in 2.2 days ext3 over md/raid had problems if the raid was rebuilding, but that was fixed in 2.4. More recently there was an incompatibility between raid5 and dm-crypt that could cause corruption, but that has been fixed on both sides (there are two ways to report errors for a block-device request. raid5 was setting only one of them and dm-crypt was listening only to the other - there were "I don't have resources at the moment" errors for read-ahead requests). If you have problems with XFS on raid, I suggest you report it to the XFS and RAID mailing lists - see the MAINTAINERS file for both. NeilBrown - 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
