* Creating an md with 3TB drives. @ 2011-09-28 8:05 Marcin M. Jessa 2011-09-28 8:23 ` NeilBrown 2011-10-05 22:25 ` Sebastian Muniz 0 siblings, 2 replies; 10+ messages in thread From: Marcin M. Jessa @ 2011-09-28 8:05 UTC (permalink / raw) To: linux-raid Hi guys. I have two 3TB drives and I want to set them up as RAID0. The problem is I can't use all of the space on them. I only get 4TB of the 6 in total. What I tried was: # parted /dev/sde GNU Parted 2.3 Using /dev/sde Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) mklabel gpt Warning: The existing disk label on /dev/sde will be destroyed and all data on this disk will be lost. Do you want to continue? Yes/No? yes (parted) mkpart primary 0 -0 Warning: The resulting partition is not properly aligned for best performance. Ignore/Cancel? ignore (parted) print Model: ATA Hitachi HDS72303 (scsi) Disk /dev/sde: 3001GB Sector size (logical/physical): 512B/512B Partition Table: gpt Number Start End Size File system Name Flags 1 17.4kB 3001GB 3001GB primary (parted) quit Then I used fdisk to change the partition type to Linux raid auto Finally I ran mdadm --create /dev/md2 --level=0 --raid-devices=2 /dev/sdd1 /dev/sde1 but mdadm -QD /dev/md2 shows 2TBs are gone. Array Size : 4294964224 (4096.00 GiB 4398.04 GB) What to do in this case? How can I a 6TB raid array ? -- Marcin M. Jessa ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 8:05 Creating an md with 3TB drives Marcin M. Jessa @ 2011-09-28 8:23 ` NeilBrown 2011-09-28 8:31 ` Marcin M. Jessa 2011-10-05 22:25 ` Sebastian Muniz 1 sibling, 1 reply; 10+ messages in thread From: NeilBrown @ 2011-09-28 8:23 UTC (permalink / raw) To: lists; +Cc: linux-raid [-- Attachment #1: Type: text/plain, Size: 1845 bytes --] On Wed, 28 Sep 2011 10:05:19 +0200 "Marcin M. Jessa" <lists@yazzy.org> wrote: > Hi guys. > > > I have two 3TB drives and I want to set them up as RAID0. > The problem is I can't use all of the space on them. > I only get 4TB of the 6 in total. > > What I tried was: > # parted /dev/sde > GNU Parted 2.3 > Using /dev/sde > Welcome to GNU Parted! Type 'help' to view a list of commands. > (parted) mklabel gpt > Warning: The existing disk label on /dev/sde will be destroyed and all > data on this disk will be lost. Do you want > to continue? > Yes/No? yes > (parted) mkpart primary 0 -0 > Warning: The resulting partition is not properly aligned for best > performance. > Ignore/Cancel? ignore > (parted) print > Model: ATA Hitachi HDS72303 (scsi) > Disk /dev/sde: 3001GB > Sector size (logical/physical): 512B/512B > Partition Table: gpt > > Number Start End Size File system Name Flags > 1 17.4kB 3001GB 3001GB primary I wouldn't bother with a partition table - just use the whole device. But partition tables should work if you want that. > > (parted) quit > > Then I used fdisk to change the partition type to Linux raid auto You can do that if you like but it will have no effect. The "raid auto" partition type only means anything on MBR partitions. You don't need to, so don't bother. > > Finally I ran > mdadm --create /dev/md2 --level=0 --raid-devices=2 /dev/sdd1 /dev/sde1 > > but mdadm -QD /dev/md2 shows 2TBs are gone. > Array Size : 4294964224 (4096.00 GiB 4398.04 GB) > > What to do in this case? How can I a 6TB raid array ? > Hmm... maybe you have an old version of mdadm. Or maybe mdadm is broken. Please report: mdadm -E /dev/sdd1 /dev/sde1 blockdev --getsz /dev/md2 cat /proc/mdstat NeilBrown > [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 190 bytes --] ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 8:23 ` NeilBrown @ 2011-09-28 8:31 ` Marcin M. Jessa 2011-09-28 8:43 ` David Brown 0 siblings, 1 reply; 10+ messages in thread From: Marcin M. Jessa @ 2011-09-28 8:31 UTC (permalink / raw) To: NeilBrown; +Cc: linux-raid On 9/28/11 10:23 AM, NeilBrown wrote: [...] >> >> Then I used fdisk to change the partition type to Linux raid auto > > You can do that if you like but it will have no effect. The "raid auto" > partition type only means anything on MBR partitions. You don't need to, so > don't bother. Thanks Neil. Not using fdisk worked like a charm. # mdadm -QD /dev/md2 mdadm: bad uuid: UUID=aaa23fb6:a7bce189:b5293030:df5c4a2 /dev/md2: Version : 1.2 Creation Time : Wed Sep 28 10:27:31 2011 Raid Level : raid0 Array Size : 5860530176 (5589.04 GiB 6001.18 GB) Raid Devices : 2 Total Devices : 2 Persistence : Superblock is persistent Update Time : Wed Sep 28 10:27:31 2011 State : clean Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Chunk Size : 512K Name : odin:2 (local to host odin) UUID : 5577bbc0:8ec6a7ff:07aff1ed:5610061c Events : 0 Number Major Minor RaidDevice State 0 8 49 0 active sync /dev/sdd1 1 8 65 1 active sync /dev/sde1 -- Marcin M. Jessa ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 8:31 ` Marcin M. Jessa @ 2011-09-28 8:43 ` David Brown 2011-09-28 15:09 ` Marcin M. Jessa 0 siblings, 1 reply; 10+ messages in thread From: David Brown @ 2011-09-28 8:43 UTC (permalink / raw) To: linux-raid On 28/09/2011 10:31, Marcin M. Jessa wrote: > On 9/28/11 10:23 AM, NeilBrown wrote: > [...] > >>> >>> Then I used fdisk to change the partition type to Linux raid auto >> >> You can do that if you like but it will have no effect. The "raid auto" >> partition type only means anything on MBR partitions. You don't need >> to, so >> don't bother. > > Thanks Neil. > Not using fdisk worked like a charm. > Using fdisk probably resulted in the disks going over to MBR rather than GPT, and thus you have a 2TB limit. By the way, you should probably try the parted again and fix the alignment issue (rather than just "ignoring" it) - it will make a /big/ difference. ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 8:43 ` David Brown @ 2011-09-28 15:09 ` Marcin M. Jessa 2011-09-29 9:09 ` David Brown 0 siblings, 1 reply; 10+ messages in thread From: Marcin M. Jessa @ 2011-09-28 15:09 UTC (permalink / raw) To: David Brown; +Cc: linux-raid On 9/28/11 10:43 AM, David Brown wrote: > On 28/09/2011 10:31, Marcin M. Jessa wrote: >> On 9/28/11 10:23 AM, NeilBrown wrote: >> [...] >> >>>> >>>> Then I used fdisk to change the partition type to Linux raid auto >>> >>> You can do that if you like but it will have no effect. The "raid auto" >>> partition type only means anything on MBR partitions. You don't need >>> to, so >>> don't bother. >> >> Thanks Neil. >> Not using fdisk worked like a charm. >> > > Using fdisk probably resulted in the disks going over to MBR rather than > GPT, and thus you have a 2TB limit. > > By the way, you should probably try the parted again and fix the > alignment issue (rather than just "ignoring" it) - it will make a /big/ > difference. In terms of speed? This RAID array is temporarily just so I can back up/restore my broken 5x2TB RAID6 but it would be interesting to know what to do. I was running # parted -a optimal /dev/sdd which was suppose to fix that warning but it didn't. -- Marcin M. Jessa ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 15:09 ` Marcin M. Jessa @ 2011-09-29 9:09 ` David Brown 2011-09-29 9:23 ` Marcin M. Jessa 0 siblings, 1 reply; 10+ messages in thread From: David Brown @ 2011-09-29 9:09 UTC (permalink / raw) To: linux-raid On 28/09/2011 17:09, Marcin M. Jessa wrote: > On 9/28/11 10:43 AM, David Brown wrote: >> On 28/09/2011 10:31, Marcin M. Jessa wrote: >>> On 9/28/11 10:23 AM, NeilBrown wrote: >>> [...] >>> >>>>> >>>>> Then I used fdisk to change the partition type to Linux raid auto >>>> >>>> You can do that if you like but it will have no effect. The "raid auto" >>>> partition type only means anything on MBR partitions. You don't need >>>> to, so >>>> don't bother. >>> >>> Thanks Neil. >>> Not using fdisk worked like a charm. >>> >> >> Using fdisk probably resulted in the disks going over to MBR rather than >> GPT, and thus you have a 2TB limit. >> >> By the way, you should probably try the parted again and fix the >> alignment issue (rather than just "ignoring" it) - it will make a /big/ >> difference. > > In terms of speed? > This RAID array is temporarily just so I can back up/restore my broken > 5x2TB RAID6 but it would be interesting to know what to do. > I was running > # parted -a optimal /dev/sdd > which was suppose to fix that warning but it didn't. > Yes, I was thinking in terms of speed. I haven't gone beyond 2 TB disks with MBR myself, so I can't comment on whether your partitions really are misaligned, or if it is just an incorrect warning. But if these disks are like most 2 TB disks with 4K sectors but which lie and claim to have 512 byte sectors (for compatibility with ancient and inferior OS'es), then partition misalignment will be major performance hit. It's worth double-checking that you've got it right here, before you go to far with the array. ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-29 9:09 ` David Brown @ 2011-09-29 9:23 ` Marcin M. Jessa 2011-09-29 11:18 ` David Brown 0 siblings, 1 reply; 10+ messages in thread From: Marcin M. Jessa @ 2011-09-29 9:23 UTC (permalink / raw) To: David Brown; +Cc: linux-raid On 9/29/11 11:09 AM, David Brown wrote: > On 28/09/2011 17:09, Marcin M. Jessa wrote: >> On 9/28/11 10:43 AM, David Brown wrote: >>> On 28/09/2011 10:31, Marcin M. Jessa wrote: >>>> On 9/28/11 10:23 AM, NeilBrown wrote: >>>> [...] >>>> >>>>>> >>>>>> Then I used fdisk to change the partition type to Linux raid auto >>>>> >>>>> You can do that if you like but it will have no effect. The "raid >>>>> auto" >>>>> partition type only means anything on MBR partitions. You don't need >>>>> to, so >>>>> don't bother. >>>> >>>> Thanks Neil. >>>> Not using fdisk worked like a charm. >>>> >>> >>> Using fdisk probably resulted in the disks going over to MBR rather than >>> GPT, and thus you have a 2TB limit. >>> >>> By the way, you should probably try the parted again and fix the >>> alignment issue (rather than just "ignoring" it) - it will make a /big/ >>> difference. >> >> In terms of speed? >> This RAID array is temporarily just so I can back up/restore my broken >> 5x2TB RAID6 but it would be interesting to know what to do. >> I was running >> # parted -a optimal /dev/sdd >> which was suppose to fix that warning but it didn't. >> > > Yes, I was thinking in terms of speed. I haven't gone beyond 2 TB disks > with MBR myself, so I can't comment on whether your partitions really > are misaligned, or if it is just an incorrect warning. But if these > disks are like most 2 TB disks with 4K sectors but which lie and claim > to have 512 byte sectors (for compatibility with ancient and inferior > OS'es), then partition misalignment will be major performance hit. It's > worth double-checking that you've got it right here, before you go to > far with the array. These are 3TB Hitachi drives and Hitachi kept 512 byte sectors: http://www.hitachigst.com/internal-drives/desktop/deskstar/deskstar-7k3000 -- Marcin M. Jessa ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-29 9:23 ` Marcin M. Jessa @ 2011-09-29 11:18 ` David Brown 0 siblings, 0 replies; 10+ messages in thread From: David Brown @ 2011-09-29 11:18 UTC (permalink / raw) To: linux-raid On 29/09/2011 11:23, Marcin M. Jessa wrote: > On 9/29/11 11:09 AM, David Brown wrote: >> On 28/09/2011 17:09, Marcin M. Jessa wrote: >>> On 9/28/11 10:43 AM, David Brown wrote: >>>> On 28/09/2011 10:31, Marcin M. Jessa wrote: >>>>> On 9/28/11 10:23 AM, NeilBrown wrote: >>>>> [...] >>>>> >>>>>>> >>>>>>> Then I used fdisk to change the partition type to Linux raid auto >>>>>> >>>>>> You can do that if you like but it will have no effect. The "raid >>>>>> auto" >>>>>> partition type only means anything on MBR partitions. You don't need >>>>>> to, so >>>>>> don't bother. >>>>> >>>>> Thanks Neil. >>>>> Not using fdisk worked like a charm. >>>>> >>>> >>>> Using fdisk probably resulted in the disks going over to MBR rather >>>> than >>>> GPT, and thus you have a 2TB limit. >>>> >>>> By the way, you should probably try the parted again and fix the >>>> alignment issue (rather than just "ignoring" it) - it will make a /big/ >>>> difference. >>> >>> In terms of speed? >>> This RAID array is temporarily just so I can back up/restore my broken >>> 5x2TB RAID6 but it would be interesting to know what to do. >>> I was running >>> # parted -a optimal /dev/sdd >>> which was suppose to fix that warning but it didn't. >>> >> >> Yes, I was thinking in terms of speed. I haven't gone beyond 2 TB disks >> with MBR myself, so I can't comment on whether your partitions really >> are misaligned, or if it is just an incorrect warning. But if these >> disks are like most 2 TB disks with 4K sectors but which lie and claim >> to have 512 byte sectors (for compatibility with ancient and inferior >> OS'es), then partition misalignment will be major performance hit. It's >> worth double-checking that you've got it right here, before you go to >> far with the array. > > These are 3TB Hitachi drives and Hitachi kept 512 byte sectors: > http://www.hitachigst.com/internal-drives/desktop/deskstar/deskstar-7k3000 > I did not know such drives existed - I thought all 2TB+ drives were 4K sector size. If these drives really have 512 byte sectors, then alignment will not be an issue. ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-09-28 8:05 Creating an md with 3TB drives Marcin M. Jessa 2011-09-28 8:23 ` NeilBrown @ 2011-10-05 22:25 ` Sebastian Muniz 2011-10-05 23:20 ` Jérôme Poulin 1 sibling, 1 reply; 10+ messages in thread From: Sebastian Muniz @ 2011-10-05 22:25 UTC (permalink / raw) To: lists; +Cc: linux-raid On 9/28/2011 5:05 AM, Marcin M. Jessa wrote: > # parted /dev/sde > GNU Parted 2.3 > Using /dev/sde > Welcome to GNU Parted! Type 'help' to view a list of commands. > (parted) mklabel gpt > Warning: The existing disk label on /dev/sde will be destroyed and all > data on this disk will be lost. Do you want > to continue? > Yes/No? yes > (parted) mkpart primary 0 -0 > Warning: The resulting partition is not properly aligned for best > performance. > Ignore/Cancel? ignore > (parted) print > Model: ATA Hitachi HDS72303 (scsi) > Disk /dev/sde: 3001GB > Sector size (logical/physical): 512B/512B > Partition Table: gpt > > Number Start End Size File system Name Flags > 1 17.4kB 3001GB 3001GB primary > > (parted) quit > I run into something similar working with 2Terabytes disks. I had to use % instead o sizes. Eg: (parted) mkpart Partition name? []? 1 File system type? [ext2]? Start? 0 End? 100% (parted) set 1 Flag to Invert? raid New state? [on]/off? on I think the "primary" concept is for DOS 3.3 partition tables and might not apply here. Please, correct if I am wrong. THanks Sebastian ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Creating an md with 3TB drives. 2011-10-05 22:25 ` Sebastian Muniz @ 2011-10-05 23:20 ` Jérôme Poulin 0 siblings, 0 replies; 10+ messages in thread From: Jérôme Poulin @ 2011-10-05 23:20 UTC (permalink / raw) To: lists; +Cc: Sebastian Muniz, linux-raid > On 9/28/2011 5:05 AM, Marcin M. Jessa wrote: > > # parted /dev/sde > GNU Parted 2.3 > Using /dev/sde > Welcome to GNU Parted! Type 'help' to view a list of commands. Try with gdisk instead, I find it much more command friendly than parted. ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2011-10-05 23:20 UTC | newest] Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2011-09-28 8:05 Creating an md with 3TB drives Marcin M. Jessa 2011-09-28 8:23 ` NeilBrown 2011-09-28 8:31 ` Marcin M. Jessa 2011-09-28 8:43 ` David Brown 2011-09-28 15:09 ` Marcin M. Jessa 2011-09-29 9:09 ` David Brown 2011-09-29 9:23 ` Marcin M. Jessa 2011-09-29 11:18 ` David Brown 2011-10-05 22:25 ` Sebastian Muniz 2011-10-05 23:20 ` Jérôme Poulin
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