On Fri, 30 Sep 2011, Adam Goryachev wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 30/09/11 04:11, Mike Dresser wrote: > > Just finishing up moving one of my backuppc servers to new larger disks, > > and figured I'd submit a success story with backuppc_tarpccopy... I > > wanted to create a new xfs filesystem rather than my usual dd and > > xfsgrowfs, as this thing has been in use since backuppc 2.1 or similar. > > Old disks were 10 x 1TB in raid10, new is 6 x 3TB's in raid6 (which in > > itself has been upgraded many times).. the new raid6 is FAR faster in > > both iops and STR than the old one. > > Hi, > > I'm curious that you say you are getting better performance from the new > RAID6 compared to the old RAID10. > > Can I assume this is because the new HDD's perform better than the old? > In other words, would it be safe to assume you would get even better > performance using RAID10 with the new HDD's than you are getting with RAID6? > > I'm just curious, I'm fairly confident that RAID10 always performs > better than RAID5 or RAID6. Just want to make sure I'm not making a mess > of things by using RAID10 over RAID6. > > Can anyone suggest any advantage of RAID6 over RAID10 (aside from the > obvious additional storage capacity/reduced wastage of space)?
Worst case, if you lose one disk, then rebuild, and during rebuild, suffer the likely consequence of losing another disk when rebuilding raid6, you still have a valid array. Worse case, fairly likely occurence with raid10, lose that second disk and lose all your data. Care for your data ==> don't use raid10. -- Tim Connors ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
