Am 19.02.2013 20:24, schrieb Gordan Bobic:
On 19/02/2013 19:05, Reindl Harald wrote:
>
>
> Am 19.02.2013 20:02, schrieb Gordan Bobic:
>>> what exactly do you need to align on the partitions?
>>
>> For a start, making sure your RAID implementation puts the metadata
>> at the end of the disk, rather than the beginning.
>
> "my RAID implementation"?
> LINUX SOFTWARE RAID
>
> and this is how the raid-partitions are looking
> no problem since years
>
> Disk /dev/sda: 2000.4 GB, 2000398934016 bytes, 3907029168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x0000ae2c
> Device Boot Start End Blocks Id System
> /dev/sda1 * 2048 1026047 512000 fd Linux raid autodetect
> /dev/sda2 1026048 31746047 15360000 fd Linux raid autodetect
> /dev/sda3 31746048 3906971647 1937612800 fd Linux raid autodetect
>
> [root@srv-rhsoft:/downloads]$ sfdisk -d /dev/sda
> # partition table of /dev/sda
> unit: sectors
> /dev/sda1 : start= 2048, size= 1024000, Id=fd, bootable
> /dev/sda2 : start= 1026048, size= 30720000, Id=fd
> /dev/sda3 : start= 31746048, size=3875225600, Id=fd
> /dev/sda4 : start= 0, size= 0, Id= 0
That's the MD partition alignment, not the alignment of the FS space within the MD
device. The two are not the same.
maybe you should read older posts in the thread
[root@srv-rhsoft:/downloads]$ tune2fs -l /dev/md1
tune2fs 1.42.5 (29-Jul-2012)
Filesystem volume name: system
Last mounted on: /
Filesystem UUID: b935b5db-0051-4f7f-83ac-6a6651fe0988
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype
needs_recovery extent flex_bg
sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: journal_data_writeback user_xattr acl nobarrier
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 1921360
Block count: 7679232
Reserved block count: 0
Free blocks: 5785905
Free inodes: 1728014
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 1022
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8176
Inode blocks per group: 511
RAID stride: 128
RAID stripe width: 256
Flex block group size: 16
Filesystem created: Wed Jun 8 13:10:52 2011
Last mount time: Fri Feb 15 20:27:01 2013
Last write time: Fri Feb 15 20:26:59 2013
Mount count: 7
Maximum mount count: -1
Last checked: Tue Feb 5 10:23:45 2013
Check interval: 31104000 (12 months)
Next check after: Fri Jan 31 10:23:45 2014
Lifetime writes: 1279 GB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 1308180
Default directory hash: half_md4
Directory Hash Seed: d48fdbd1-5e0c-4dc8-8d0b-7e3c0d6c1e18
Journal backup: inode blocks
[root@srv-rhsoft:/downloads]$ tune2fs -l /dev/md2
tune2fs 1.42.5 (29-Jul-2012)
Filesystem volume name: data
Last mounted on: /tmp
Filesystem UUID: 1abf071b-0c78-4b82-bb21-b3dfb269afa8
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal ext_attr resize_inode dir_index filetype
needs_recovery extent flex_bg
sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags: signed_directory_hash
Default mount options: journal_data_writeback user_xattr acl nobarrier
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 242204672
Block count: 968805632
Reserved block count: 0
Free blocks: 524215841
Free inodes: 241237943
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 793
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 8192
Inode blocks per group: 512
RAID stride: 128
RAID stripe width: 256
Flex block group size: 16
Filesystem created: Wed Jun 8 13:10:56 2011
Last mount time: Fri Feb 15 20:27:03 2013
Last write time: Fri Feb 15 20:27:03 2013
Mount count: 7
Maximum mount count: -1
Last checked: Tue Feb 5 10:23:53 2013
Check interval: 31104000 (12 months)
Next check after: Fri Jan 31 10:23:53 2014
Lifetime writes: 44 TB
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 256
Required extra isize: 28
Desired extra isize: 28
Journal inode: 8
First orphan inode: 52691565
Default directory hash: half_md4
Directory Hash Seed: 656f345f-ec1f-4281-82fb-58809a18dad2
Journal backup: inode blocks