Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-05 Thread Tonmaus
Hi, > > In your case, there are two other aspects: > > - if you pool small devices as JBODS below a vdev > > member, no superordinate parity will help you when > > you loose a member of the underlying JBOD. The > whole > > pool will just be broken, and you will loose a > good > > part of your data

Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-05 Thread Tonmaus
Hi, > > In your case, there are two other aspects: > > - if you pool small devices as JBODS below a vdev > > member, no superordinate parity will help you when > > you loose a member of the underlying JBOD. The > whole > > pool will just be broken, and you will loose a > good > > part of your data

Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-04 Thread Daniel Smedegaard Buus
> Hi, > Hi tonmaus :) (btw, isn't that German for Audio Mouse?) > the corners I am basing my previous idea on you can > find here: > http://www.solarisinternals.com/wiki/index.php/ZFS_Bes > t_Practices_Guide#RAIDZ_Configuration_Requirements_and > _Recommendations Yep, me too :) > I can confirm

Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-04 Thread Tonmaus
Hi, the corners I am basing my previous idea on you can find here: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#RAIDZ_Configuration_Requirements_and_Recommendations I can confirm some of the recommendations already from personal practise. First and foremost this sentenc

Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-04 Thread Daniel Smedegaard Buus
Hi tonmaus, thanks for your reply :) I do know that this isn't best practice, and I've also considered the approach you're hinting at of distributing each vdev over different disks. However, this yields a massive loss in capacity if I want double-parity RAIDZ2 (which I do ;) ), and I'll be unab

Re: [zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-03 Thread Tonmaus
Hi, following the zfs best practise guide, my understanding is that neither choice is very good. There is maybe a third choice, that is pool --vdev1 --disk --disk . --disk ... --vdev n --disk --disk . --

[zfs-discuss] Question about multiple RAIDZ vdevs using slices on the same disk

2010-03-03 Thread Daniel Smedegaard Buus
Hi all :) I've been wanting to make the switch from XFS over RAID5 to ZFS/RAIDZ2 for some time now, ever since I read about ZFS the first time. Absolutely amazing beast! I've built my own little hobby server at home and have a boatload of disks in different sizes that I've been using together t