Hi William,
On 06/21/2011 04:50 PM, william L'Heureux wrote:
>
> ./lsdrv
> PCI [sata_mv] 02:01.0 SCSI storage controller: Marvell Technology Group Ltd. MV8 8SX6081 8-port SATA II PCI-X Controller (rev 09)
> ââscsi 0:0:0:0 ATA Hitachi HDS72202 {JK1171YAGA977S}
> â ââsda: [8:0] Partitioned (gpt) 1.82t
> â ââsda1: [8:1] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e-d e81-09a8-d6635b58832d}
> â ââsda2: [8:2] Empty/Unknown 1.00g
> ââscsi 1:0:0:0 ATA WL2000GSA1672 {WOL240094387}
> â ââsdb: [8:16] Partitioned (gpt) 1.82t
> â ââsdb1: [8:17] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf- 7d64-ec26-eec1046592bc}
> â ââsdb2: [8:18] Empty/Unknown 1.00g
> ââscsi 2:x:x:x [Empty]
> ââscsi 3:x:x:x [Empty]
> ââscsi 4:0:0:0 ATA WL2000GSA1672 {WOL240094356}
> â ââsdc: [8:32] Partitioned (gpt) 1.82t
> â ââsdc1: [8:33] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e- de81-09a8-d6635b58832d}
> â ââsdc2: [8:34] Empty/Unknown 1.00g
> ââscsi 5:0:0:0 ATA WL2000GSA3272C {WOL240146377}
> â ââsdd: [8:48] Partitioned (gpt) 1.82t
> â ââsdd1: [8:49] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e- de81-09a8-d6635b58832d}
> â ââsdd2: [8:50] Empty/Unknown 1.00g
> ââscsi 6:x:x:x [Empty]
> ââscsi 7:x:x:x [Empty]
> PCI [sata_mv] 03:02.0 SCSI storage controller: Marvell Technology Group Ltd. MV8 8SX6081 8-port SATA II PCI-X Controller (rev 09)
> ââscsi 8:0:0:0 ATA WL2000GSA3272 {WOL240102099}
> â ââsde: [8:64] Partitioned (gpt) 1.82t
> â ââsde1: [8:65] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf- 7d64-ec26-eec1046592bc}
> â ââsde2: [8:66] Empty/Unknown 1.00g
> ââscsi 9:x:x:x [Empty]
> ââscsi 10:0:0:0 ATA Hitachi HDS72202 {JK1171YAGDDUGS}
> â ââsdf: [8:80] Partitioned (gpt) 1.82t
> â ââsdf1: [8:81] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf- 7d64-ec26-eec1046592bc}
> â ââsdf2: [8:82] Empty/Unknown 1.00g
> ââscsi 11:0:0:0 ATA ST32000542AS {6XW1B8WP}
> â ââsdg: [8:96] Partitioned (gpt) 1.82t
> â ââsdg1: [8:97] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf- 7d64-ec26-eec1046592bc}
> â ââsdg2: [8:98] Empty/Unknown 1.00g
> ââscsi 12:0:0:0 ATA WL2000GSA3272 {WOL240102098}
> â ââsdh: [8:112] Partitioned (gpt) 1.82t
> â ââsdh1: [8:113] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e -de81-09a8-d6635b58832d}
> â ââsdh2: [8:114] Empty/Unknown 1.00g
> ââscsi 13:0:0:0 ATA WDC WD20EADS-00S {WD-WCAVY3323665}
> â ââsdi: [8:128] Partitioned (gpt) 1.82t
> â ââsdi1: [8:129] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e -de81-09a8-d6635b58832d}
> â ââsdi2: [8:130] Empty/Unknown 1.00g
> ââscsi 14:0:0:0 ATA WDC WD20EADS-00S {WD-WCAVY3356471}
> â ââsdj: [8:144] Partitioned (gpt) 1.82t
> â ââsdj1: [8:145] MD raid6 (6) 1.82t inactive 'BILLSSHACK:0' {3bcf45ef-da3e -de81-09a8-d6635b58832d}
> â ââsdj2: [8:146] Empty/Unknown 1.00g
> ââscsi 15:x:x:x [Empty]
> PCI [ahci] 00:1f.2 SATA controller: Intel Corporation 82801IR/IO/IH (ICH9R/DO/DH ) 6 port SATA AHCI Controller (rev 02)
> ââscsi 16:x:x:x [Empty]
> ââscsi 17:x:x:x [Empty]
> ââscsi 18:0:0:0 ATA WDC WD20EADS-00S {WD-WCAVY3286477}
> â ââsdk: [8:160] Partitioned (gpt) 1.82t
> â ââsdk1: [8:161] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf -7d64-ec26-eec1046592bc}
> â ââsdk2: [8:162] Empty/Unknown 1.00g
> ââscsi 19:0:0:0 ATA WDC WD400BD-60LT {WD-WMAME1857443}
> â ââsdl: [8:176] Partitioned (dos) 37.27g
> â ââsdl1: [8:177] Partitioned (dos) 133.32m {617e6b03-6cc1-4974-8acc-19a742 cd06f4}
> â â ââMounted as /dev/sdl1 @ /boot
> â ââsdl2: [8:178] PV LVM2_member 22.00g/37.14g VG vgDeb 37.14g {0ecAby-vT4R -IHpt-5kEK-v1W0-u6AL-bUcFDG}
> â ââVolume Group vgDeb (sdl2) 15.14g free {a6nM6t-LPKY-gMdi-9YP4-t2tv-H qjv-aMgmEa}
> â ââdm-1: [251:1] LV 'root' (reiserfs) 10.00g {f497b9bd-e24f-4d20-9f6 b-282b6493f341}
> â â ââMounted as /dev/mapper/vgDeb-root @ /mnt/debian
> â ââdm-2: [251:2] LV 'rootu' (reiserfs) 10.00g {bc0f350c-4af7-4192-b1 ea-4528101db28e}
> â â ââMounted as /dev/mapper/vgDeb-rootu @ /
> â ââdm-0: [251:0] LV 'swap' (swap) 2.00g {13264e60-a1d1-4bf3-af9f-edd 948212a63}
> ââscsi 20:0:0:0 ATA WDC WD20EADS-00S {WD-WCAVY3271728}
> â ââsdm: [8:192] MD raid6 (4) 1.82t inactive {b52df561-301f-043c-b5a7-b1ab9d93 4878}
> â ââsdm1: [8:193] MD raid6 (6) 1.82t inactive 'billsshack:3' {751fd632-4baf -7d64-ec26-eec1046592bc}
> â ââsdm2: [8:194] MD raid6 (6) 1.00g inactive 'billsshack:2' {cf2450e4-bc7a -9cea-cb5c-cda96f3ec87c}
> ââscsi 21:x:x:x [Empty]
> Other Block Devices
> ââram0: [1:0] Empty/Unknown 64.00m
> ââram1: [1:1] Empty/Unknown 64.00m
> ââram2: [1:2] Empty/Unknown 64.00m
> ââram3: [1:3] Empty/Unknown 64.00m
> ââram4: [1:4] Empty/Unknown 64.00m
> ââram5: [1:5] Empty/Unknown 64.00m
> ââram6: [1:6] Empty/Unknown 64.00m
> ââram7: [1:7] Empty/Unknown 64.00m
> ââram8: [1:8] Empty/Unknown 64.00m
> ââram9: [1:9] Empty/Unknown 64.00m
> ââram10: [1:10] Empty/Unknown 64.00m
> ââram11: [1:11] Empty/Unknown 64.00m
> ââram12: [1:12] Empty/Unknown 64.00m
> ââram13: [1:13] Empty/Unknown 64.00m
> ââram14: [1:14] Empty/Unknown 64.00m
> ââram15: [1:15] Empty/Unknown 64.00m
OK. We know the basic layout. (I think I'm going to have to give up the fancy line-drawing characters. Very few emails get them right...)
> mdadm --detail /dev/md0 /dev/md1
> /dev/md0:
> Version : 1.2
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Array Size : 7809854976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 1952463744 (1862.01 GiB 1999.32 GB)
> Raid Devices : 6
> Total Devices : 6
> Persistence : Superblock is persistent
>
> Update Time : Tue Jun 21 11:23:46 2011
> State : clean
> Active Devices : 6
> Working Devices : 6
> Failed Devices : 0
> Spare Devices : 0
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Events : 0
>
> Number Major Minor RaidDevice State
> 0 8 1 0 active sync /dev/sda1
> 1 8 33 1 active sync /dev/sdc1
> 2 8 49 2 active sync /dev/sdd1
> 3 8 113 3 active sync /dev/sdh1
> 4 8 129 4 active sync /dev/sdi1
> 5 8 145 5 active sync /dev/sdj1
> /dev/md1:
> Version : 1.2
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Array Size : 7809855488 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 1952463872 (1862.01 GiB 1999.32 GB)
> Raid Devices : 6
> Total Devices : 6
> Persistence : Superblock is persistent
>
> Intent Bitmap : Internal
>
> Update Time : Tue Jun 14 20:58:11 2011
> State : active
> Active Devices : 6
> Working Devices : 6
> Failed Devices : 0
> Spare Devices : 0
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Name : billsshack:3
> UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Events : 235082
>
> Number Major Minor RaidDevice State
> 0 8 161 0 active sync /dev/sdk1
> 1 8 17 1 active sync /dev/sdb1
> 8 8 193 2 active sync /dev/sdm1
> 5 8 81 3 active sync /dev/sdf1
> 6 8 65 4 active sync /dev/sde1
> 7 8 97 5 active sync /dev/sdg1
It is not immediately clear from this, or from your first email, which of your two raid6 arrays is messed up.
> mdadm --examine /dev/sd[abcdefghijkm]1
> /dev/sda1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : b6569293:759c2fbe:d52f346f:2ea85306
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 9d90c200 - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 0
> Array State : AAAAAA ('A' == active, '.' == missing)
2048 sectors offset. This is important.
> /dev/sdb1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 0b6a5d24:bff1c401:259c054b:ca7ccc7f
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : bed09424 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 1
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdc1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 298ee23a:4968978c:0557d189:1c45ff55
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 7d918966 - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 1
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdd1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 2b8ef61c:d3d59200:659d4367:573a992d
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 88ad328d - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 2
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sde1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 1de7b73d:73ff1f80:c0903159:87fc8287
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 6c689348 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 4
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdf1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 3247b37b:aa741693:0d58ccb6:b814a5d1
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 65174812 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 3
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdg1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 8483b8f7:8c3302c6:9403a3e9:3c3a094c
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : c1431453 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 5
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdh1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 1abe5069:570c484e:2199572d:cd0d641f
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : da9b6833 - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 3
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdi1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 083fa0cc:798c09bb:febe5adf:f99eb7b8
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : f603204f - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 4
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdj1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x0
> Array UUID : 3bcf45ef:da3ede81:09a8d663:5b58832d
> Name : BILLSSHACK:0 (local to host BILLSSHACK)
> Creation Time : Tue Jun 21 11:23:46 2011
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619709952 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927488 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : b91a18a4:8aba8cf8:bf046c8f:f683cf16
>
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 192754d0 - correct
> Events : 2
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 5
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdk1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 77b91aac:68eed1cc:e2404d60:f5962abc
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 63409f22 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 0
> Array State : AAAAAA ('A' == active, '.' == missing)
> /dev/sdm1:
> Magic : a92b4efc
> Version : 1.2
> Feature Map : 0x1
> Array UUID : 751fd632:4baf7d64:ec26eec1:046592bc
> Name : billsshack:3
> Creation Time : Tue Jun 15 09:59:08 2010
> Raid Level : raid6
> Raid Devices : 6
>
> Avail Dev Size : 3904927887 (1862.01 GiB 1999.32 GB)
> Array Size : 15619710976 (7448.06 GiB 7997.29 GB)
> Used Dev Size : 3904927744 (1862.01 GiB 1999.32 GB)
> Data Offset : 2048 sectors
> Super Offset : 8 sectors
> State : clean
> Device UUID : 9b5a6d24:38202032:c40fc666:1f2570d7
>
> Internal Bitmap : 2 sectors from superblock
> Update Time : Tue Jun 21 16:35:23 2011
> Checksum : 629fcf29 - correct
> Events : 235082
>
> Layout : left-symmetric
> Chunk Size : 128K
>
> Device Role : Active device 2
> Array State : AAAAAA ('A' == active, '.' == missing)
They all have a 2048 sector offset. This is good. It means your good array and your bad array were both created with a fairly recent copy of mdadm.
> cat /etc/lvm/backup/*
> # Generated by LVM2 version 2.02.66(2) (2010-05-20): Sat May 21 09:40:02 2011
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing 'vgcfgbackup'"
>
> creation_host = "BILLSSHACK" # Linux BILLSSHACK 2.6.35-28-generic-pae #49-Ubuntu SMP Tue Mar 1 14:58:06 UTC 2011 i686
> creation_time = 1305985202 # Sat May 21 09:40:02 2011
>
> vgDeb {
> id = "a6nM6t-LPKY-gMdi-9YP4-t2tv-Hqjv-aMgmEa"
> seqno = 10
> status = ["RESIZEABLE", "READ", "WRITE"]
> flags = []
> extent_size = 8192 # 4 Megabytes
> max_lv = 0
> max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "0ecAby-vT4R-IHpt-5kEK-v1W0-u6AL-bUcFDG"
> device = "/dev/sdl2" # Hint only
>
> status = ["ALLOCATABLE"]
> flags = []
> dev_size = 77883120 # 37.1376 Gigabytes
> pe_start = 384
> pe_count = 9507 # 37.1367 Gigabytes
> }
> }
>
> logical_volumes {
>
> swap {
> id = "ywPLVh-84xx-UvPV-fUaI-PPgU-ZiTw-j6rs07"
> status = ["READ", "WRITE", "VISIBLE"]
> flags = []
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 512 # 2 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
> ]
> }
> }
>
> root {
> id = "x0wMox-eWu2-EmDh-V0Ix-47Zl-iqVc-fTYjVB"
> status = ["READ", "WRITE", "VISIBLE"]
> flags = []
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 2560 # 10 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 512
> ]
> }
> }
>
> rootu {
> id = "IFNTXp-4DBN-jjtc-PrCE-Mxs5-68FH-vY5QWK"
> status = ["READ", "WRITE", "VISIBLE"]
> flags = []
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 2560 # 10 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 5632
> ]
> }
> }
> }
> }
We won't need the above. That's your system group.
> # Generated by LVM2 version 2.02.66(2) (2010-05-20): Sat May 21 09:40:02 2011
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing 'vgcfgbackup'"
>
> creation_host = "BILLSSHACK" # Linux BILLSSHACK 2.6.35-28-generic-pae #49-Ubuntu SMP Tue Mar 1 14:58:06 UTC 2011 i686
> creation_time = 1305985202 # Sat May 21 09:40:02 2011
>
> vgRAID60 {
> id = "RUodpI-jXin-DEjs-fS3R-4hjA-hQ4l-41dAaJ"
> seqno = 58
> status = ["RESIZEABLE", "READ", "WRITE"]
> flags = []
> extent_size = 8192 # 4 Megabytes
> max_lv = 0
> max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "V5c1yI-XD3D-FXlB-VDYd-tUfo-eIUC-hXQfVW"
> device = "/dev/md0" # Hint only
>
> status = ["ALLOCATABLE"]
> flags = []
> dev_size = 15619710464 # 7.27349 Terabytes
> pe_start = 512
> pe_count = 1906702 # 7.27349 Terabytes
> }
>
> pv1 {
> id = "XRg0sr-C21F-4v2f-9FzZ-JSQr-JZe2-Tbexqf"
> device = "/dev/md1" # Hint only
>
> status = ["ALLOCATABLE"]
> flags = []
> dev_size = 15619710464 # 7.27349 Terabytes
> pe_start = 512
> pe_count = 1906702 # 7.27349 Terabytes
> }
> }
We can go hunting for these ids. They'll certainly show up on the first disk in each raid. They might also show up in the 5th disk in each raid, if by chance the other data chunks in the stripe are zeros. Please show:
for x in /dev/sd[abcdefghijkm] ; do echo "**** $x ****" ; dd if=$x skip=2056 count=2 2>/dev/null |strings ; done
> logical_volumes {
>
> data0 {
> id = "Odw7bi-10cB-8SSX-Y4BL-wqs6-4qWT-3AHaYL"
> status = ["READ", "WRITE", "VISIBLE"]
> flags = []
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 3670016 # 14 Terabytes
>
> type = "striped"
> stripe_count = 2
> stripe_size = 128 # 64 Kilobytes
>
> stripes = [
> "pv0", 0,
> "pv1", 0
> ]
> }
> }
> }
> }
Hmmm. Striped LVM on top of raid6. Trying to get better performance? With this striping, getting the data back requires 100% success. You won't get half of your data. You might get all of it, or you might get none of it.
> Again, i am not a raid pro. those commands i can understand, if anywhere i make a mistake about a mdadm concept, please tell me.
>
> Nevertheless, thanks for you help
You are welcome.
Phil
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