Re: can Disk Utility be used to create RAID10?
On Mon, Sep 1, 2014 at 12:34 AM, LuKreme krem...@kreme.com wrote: On 30 Aug 2014, at 12:01 , Dinse, Gregg (NIH/NIEHS) [C] di...@niehs.nih.gov wrote: Hi, I have a 2012 Mac Pro tower (with 4 drive bays), running MacOSX 10.9.4 (the latest version of Mavericks). Can I use Apple's Disk Utility to create a RAID10 disk array? That is, could I put 4 equal-sized hard drives in the Mac Pro tower and then use Disk Utility to create a RAID10 setup, which is a stripe of mirrors? I don't think so. If I recall correctly, DU does either Raid0 or Raid1, but not Raid10. However, since a RAID10 is just a RAID1 of a RAID0 out's quite possible that you can first create the RAID0 and then create the RAID1 You will need 5 drives total (4 for the RAID and a boot drive). Erase the 4 drives, pair two of them into a raid0 (Pretty sure OS X calls it a Mirror and doesn't use RAID0), then create the striped array. If it lets you create the striped array, then you are good to go. btw, RAID 10 is not usually raid 0 + raid 1 as suggested above but is (much) better arranged as a stripe across mirrored pairs, i.e. disk 1 + disk 2 = RAID1 mirror = Array A disk 3 + disk 4 = RAID1 mirror = Array B Array A + Array B = RAID 0 = Array C (RAID10) although on re-reading I think you did mean that and just typo-ed the raid level as you do talk about a mirror and then a strip. ___ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
Re: can Disk Utility be used to create RAID10?
On 30 Aug 2014, at 12:01 , Dinse, Gregg (NIH/NIEHS) [C] di...@niehs.nih.gov wrote: Hi, I have a 2012 Mac Pro tower (with 4 drive bays), running MacOSX 10.9.4 (the latest version of Mavericks). Can I use Apple's Disk Utility to create a RAID10 disk array? That is, could I put 4 equal-sized hard drives in the Mac Pro tower and then use Disk Utility to create a RAID10 setup, which is a stripe of mirrors? I don't think so. If I recall correctly, DU does either Raid0 or Raid1, but not Raid10. However, since a RAID10 is just a RAID1 of a RAID0 out's quite possible that you can first create the RAID0 and then create the RAID1 You will need 5 drives total (4 for the RAID and a boot drive). Erase the 4 drives, pair two of them into a raid0 (Pretty sure OS X calls it a Mirror and doesn't use RAID0), then create the striped array. If it lets you create the striped array, then you are good to go. If this is possible, should it be nearly as good as a commercial software RAID solution, as long as I am happy with RAID10 and do not care about RAID5 or RAID6? I've never had an issue with the OS X softRAID, but I've only used it off and on since I got my firs MacPro1,1. I know that Disk Utility does RAID0 and RAID1, but I do not know whether it can be used to combine those software RAIDs. For example, suppose my 4 hard drives are named Disk1, Disk2, Disk3, and Disk4. I was wondering if I could use Disk Utility to combine Disk1 and Disk2 (via RAID1) into Mirror1, and likewise combine Disk3 and Disk4 (via RAID1) into Mirror2, and then combine Mirror1 and Mirror2 (via RAID0) into StripedDisk. In particular, if all disks are 3 TB, then I was hoping to end up with a 6-TB RAID10 disk array, which would be a stripe of two 3-TB mirrors. The drives have to be identical in size. This means same model and manufacturer, probably. If this is possible, would you trust it? I don't know why not, but I would never sacrifice that much disk space just for redundancy. I figure all disks must be the same size, but do they have to be identical? In my case, they would all be Seagates and all have the same nominal sizes and speeds, but the exact models (and therefore exact sizes to the byte) might differ. If I am remembering correctly, I could not create a RAID with drive that differed in size by less that 100MB, but that was a long time ago. -- Be careful what you wish for. You never know who will be listening. Or what, for that matter. ___ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
Re: can Disk Utility be used to create RAID10?
Yes, you can do RAID 10 just using Disk Utility. Sent from my iPhone On Aug 31, 2014, at 6:34 PM, LuKreme krem...@kreme.com wrote: On 30 Aug 2014, at 12:01 , Dinse, Gregg (NIH/NIEHS) [C] di...@niehs.nih.gov wrote: Hi, I have a 2012 Mac Pro tower (with 4 drive bays), running MacOSX 10.9.4 (the latest version of Mavericks). Can I use Apple's Disk Utility to create a RAID10 disk array? That is, could I put 4 equal-sized hard drives in the Mac Pro tower and then use Disk Utility to create a RAID10 setup, which is a stripe of mirrors? I don't think so. If I recall correctly, DU does either Raid0 or Raid1, but not Raid10. However, since a RAID10 is just a RAID1 of a RAID0 out's quite possible that you can first create the RAID0 and then create the RAID1 You will need 5 drives total (4 for the RAID and a boot drive). Erase the 4 drives, pair two of them into a raid0 (Pretty sure OS X calls it a Mirror and doesn't use RAID0), then create the striped array. If it lets you create the striped array, then you are good to go. If this is possible, should it be nearly as good as a commercial software RAID solution, as long as I am happy with RAID10 and do not care about RAID5 or RAID6? I've never had an issue with the OS X softRAID, but I've only used it off and on since I got my firs MacPro1,1. I know that Disk Utility does RAID0 and RAID1, but I do not know whether it can be used to combine those software RAIDs. For example, suppose my 4 hard drives are named Disk1, Disk2, Disk3, and Disk4. I was wondering if I could use Disk Utility to combine Disk1 and Disk2 (via RAID1) into Mirror1, and likewise combine Disk3 and Disk4 (via RAID1) into Mirror2, and then combine Mirror1 and Mirror2 (via RAID0) into StripedDisk. In particular, if all disks are 3 TB, then I was hoping to end up with a 6-TB RAID10 disk array, which would be a stripe of two 3-TB mirrors. The drives have to be identical in size. This means same model and manufacturer, probably. If this is possible, would you trust it? I don't know why not, but I would never sacrifice that much disk space just for redundancy. I figure all disks must be the same size, but do they have to be identical? In my case, they would all be Seagates and all have the same nominal sizes and speeds, but the exact models (and therefore exact sizes to the byte) might differ. If I am remembering correctly, I could not create a RAID with drive that differed in size by less that 100MB, but that was a long time ago. -- Be careful what you wish for. You never know who will be listening. Or what, for that matter. ___ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk ___ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
can Disk Utility be used to create RAID10?
Hi, I have a 2012 Mac Pro tower (with 4 drive bays), running MacOSX 10.9.4 (the latest version of Mavericks). Can I use Apple's Disk Utility to create a RAID10 disk array? That is, could I put 4 equal-sized hard drives in the Mac Pro tower and then use Disk Utility to create a RAID10 setup, which is a stripe of mirrors? If this is possible, should it be nearly as good as a commercial software RAID solution, as long as I am happy with RAID10 and do not care about RAID5 or RAID6? I know that Disk Utility does RAID0 and RAID1, but I do not know whether it can be used to combine those software RAIDs. For example, suppose my 4 hard drives are named Disk1, Disk2, Disk3, and Disk4. I was wondering if I could use Disk Utility to combine Disk1 and Disk2 (via RAID1) into Mirror1, and likewise combine Disk3 and Disk4 (via RAID1) into Mirror2, and then combine Mirror1 and Mirror2 (via RAID0) into StripedDisk. In particular, if all disks are 3 TB, then I was hoping to end up with a 6-TB RAID10 disk array, which would be a stripe of two 3-TB mirrors. If this is possible, would you trust it? I figure all disks must be the same size, but do they have to be identical? In my case, they would all be Seagates and all have the same nominal sizes and speeds, but the exact models (and therefore exact sizes to the byte) might differ. Thanks in advance for any help you can provide. Gregg ___ MacOSX-talk mailing list MacOSX-talk@omnigroup.com http://www.omnigroup.com/mailman/listinfo/macosx-talk
