Hi All, Thanks for the recent info on my controller problems. So now I''m taking a different approach but had a more basic question. I have: 2x150GB SATA ii disks 2x500GB SATA ii disks Is it possible/recommended to have something like a pool of two raidz pools. This will hopefully maximize my storage space compared to mirrors, and still give me self healing yes? so something like createing: zpool smallpool raidz 150a 150b zpool mediumpool raidz 500a 500b zpool joinedpool smallpool mediumpool ????possible Or would it me safer/better to have two separate pools rather than trying to combine them? assuming I can get the above into some kinda single pool, I have a few top level data folders that I would then create, ie Music, Video, Images, Pictures. On my test system I was just creating these as folders with NFS shares to each folder. Is there any advantage to using the zfs command rather than just plain folders besides being able to take a snapshot of a specific folder? I also wanted to test a recovery of my pool, so my took two disk raidz pool onto a friends freebsd box. It seems both systems use zfs version 6, but the import failed. I noticed on the boot logs: GEOM: ad6: corrupt or invalid GPT detected. GEOM: ad6: GPT rejected -- may not be recoverable. Is that a solaris or freebsd problem do you think? Thanks in advance for any help! Peter This message posted from opensolaris.org
> I have: > 2x150GB SATA ii disks > 2x500GB SATA ii disks > > Is it possible/recommended to have something like a pool of two raidz pools. This will hopefully maximize my storage space compared to mirrors, and still give me self healing yes?You can''t create a RAID-Z out of two disks. You either have to go with two mirrors (150GB and 500GB) in a pool, or the funkier variation of a RAID-Z and mirror (4x150GB and a 350GB mirror). Both of these configurations should offer full redundancy, though if one of the 500GB disks fail, it''ll affect two vdevs! The mirror pool gives you 650GB, the mixed pool around 800GB. I''d suggest going with the mirror, for better overall read performance. -mg
> Hi, thanks for the tips. I currently using a 2 disk raidz configuration and it seems to work fine, but I''ll probably take your advice and use mirrors because I''m finding the raidz a bit slow.What? How would a two disk RAID-Z work, anyway? A three disk RAID-Z missing a disk? 50% of the total diskspace parity (which would be a crippled mirror)? I''m confused. -mg
On 9/15/07, Mario Goebbels <me at tomservo.cc> wrote:> You can''t create a RAID-Z out of two disks. You either have to go with > two mirrors (150GB and 500GB) in a pool, or the funkier variation of a > RAID-Z and mirror (4x150GB and a 350GB mirror).Actually, you can. It may not make sense but it is possible (1 more than the number of parity according to the man pages). -- Just me, Wire ... Blog: <prstat.blogspot.com>
On 9/15/07, Peter Bridge <peter_bridge at hotmail.com> wrote:> I have: > 2x150GB SATA ii disks > 2x500GB SATA ii disksI will go with a mirror. You need at least 500GB in parity anyway (since you want to survive any disk failure). That means the maximum you can get out of this setup is 800GB. With a mirror, you get 650GB (loss of 150GB) but you gain flexibility and performance (depending on what you do). -- Just me, Wire ... Blog: <prstat.blogspot.com>
Mario Goebbels wrote:>> Hi, thanks for the tips. I currently using a 2 disk raidz configuration and it seems to work fine, but I''ll probably take your advice and use mirrors because I''m finding the raidz a bit slow. > > What? How would a two disk RAID-Z work, anyway? A three disk RAID-Z > missing a disk? 50% of the total diskspace parity (which would be a > crippled mirror)?It works like a 2-way mirror that cannot be expanded to a 3-way mirror. I''m not sure I would consider it crippled, but it is confusing the intention of the sys admin. -- richard
> I also wanted to test a recovery of my pool, so my took two disk raidz pool onto a friends freebsd box. It seems both systems use zfs version 6, but the import failed. I noticed on the boot logs: > > GEOM: ad6: corrupt or invalid GPT detected. > GEOM: ad6: GPT rejected -- may not be recoverable. > > Is that a solaris or freebsd problem do you think?This has to do with the GPT (http://en.wikipedia.org/wiki/GUID_Partition_Table) support rather than ZFS. IIRC the GPT:s written by Solaris are valid, just not recognized properly by FreeBSD (but I am out of date and don''t remember the source of this information). AFAIK the ZFS pools themselves are fully portable. -- / Peter Schuller PGP userID: 0xE9758B7D or ''Peter Schuller <peter.schuller at infidyne.com>'' Key retrieval: Send an E-Mail to getpgpkey at scode.org E-Mail: peter.schuller at infidyne.com Web: http://www.scode.org -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 187 bytes Desc: not available URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20070917/2dbd5563/attachment.bin>