Hello, I would like to be able to access from linux a native windows xp 3-disk raid 0 array, however either there's something that I am missing from documentation or linux ldm support status needs a clarification (attempting to read data fails) root@sysresccd /root % grep -i ldm /var/log/messages Mar 21 17:39:34 sysresccd kernel: [ 3.436624] sda: [LDM] sda1 Mar 21 17:39:34 sysresccd kernel: [ 4.669583] sdb: [LDM] sdb1 Mar 21 17:39:34 sysresccd kernel: [ 6.478531] sdc: [LDM] sdc1 root@sysresccd /root % egrep 'sda|sdb|sdc' /var/log/messages Mar 21 17:39:34 sysresccd kernel: [ 3.435539] sd 0:0:0:0: [sda] 488397168 512-byte logical blocks: (250 GB/232 GiB) Mar 21 17:39:34 sysresccd kernel: [ 3.436025] sd 0:0:0:0: [sda] Write Protect is off Mar 21 17:39:34 sysresccd kernel: [ 3.436187] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00 Mar 21 17:39:34 sysresccd kernel: [ 3.436207] sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Mar 21 17:39:34 sysresccd kernel: [ 3.436624] sda: [LDM] sda1 Mar 21 17:39:34 sysresccd kernel: [ 3.492877] sd 0:0:0:0: [sda] Attached SCSI disk Mar 21 17:39:34 sysresccd kernel: [ 4.668474] sd 2:0:0:0: [sdb] 488397168 512-byte logical blocks: (250 GB/232 GiB) Mar 21 17:39:34 sysresccd kernel: [ 4.668969] sd 2:0:0:0: [sdb] Write Protect is off Mar 21 17:39:34 sysresccd kernel: [ 4.669123] sd 2:0:0:0: [sdb] Mode Sense: 00 3a 00 00 Mar 21 17:39:34 sysresccd kernel: [ 4.669152] sd 2:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Mar 21 17:39:34 sysresccd kernel: [ 4.669583] sdb: [LDM] sdb1 Mar 21 17:39:34 sysresccd kernel: [ 4.758469] sd 2:0:0:0: [sdb] Attached SCSI disk Mar 21 17:39:34 sysresccd kernel: [ 6.477459] sd 4:0:0:0: [sdc] 488397168 512-byte logical blocks: (250 GB/232 GiB) Mar 21 17:39:34 sysresccd kernel: [ 6.477949] sd 4:0:0:0: [sdc] Write Protect is off Mar 21 17:39:34 sysresccd kernel: [ 6.478103] sd 4:0:0:0: [sdc] Mode Sense: 00 3a 00 00 Mar 21 17:39:34 sysresccd kernel: [ 6.478129] sd 4:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Mar 21 17:39:34 sysresccd kernel: [ 6.478531] sdc: [LDM] sdc1 Mar 21 17:39:34 sysresccd kernel: [ 6.569781] sd 4:0:0:0: [sdc] Attached SCSI disk root@sysresccd /root % cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] unused devices: <none> root@sysresccd /root % mdadm --build -l 0 -n 3 /dev/md0 /dev/sda1 /dev/sdb1 /dev/sdc1 mdadm: array /dev/md0 built and started. root@sysresccd /root % parted /dev/md0 print Error: /dev/md0: unrecognised disk label root@sysresccd /root % mdadm --build -l 0 -n 3 /dev/md0 /dev/sda /dev/sdb /dev/sdc mdadm: array /dev/md0 built and started. root@sysresccd /root % parted /dev/md0 print Model: Linux Software RAID Array (md) Disk /dev/md0: 750GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 250GB 250GB primary ntfs-3g obviously will fail reading data which is only a third of what it needs: root@sysresccd /root % ntfs-3g -o ro /dev/md0p1 /mnt/windows NTFS signature is missing. Failed to mount '/dev/md0p1': Invalid argument The device '/dev/md0p1' doesn't seem to have a valid NTFS. Maybe the wrong device is used? Or the whole disk instead of a partition (e.g. /dev/sda, not /dev/sda1)? Or the other way around? root@sysresccd /root % grep md /var/log/messages Mar 21 17:39:34 sysresccd kernel: [ 23.044505] md: linear personality registered for level -1 Mar 21 17:39:34 sysresccd kernel: [ 23.046248] md: multipath personality registered for level -4 Mar 21 17:39:34 sysresccd kernel: [ 23.047733] md: raid0 personality registered for level 0 Mar 21 17:39:34 sysresccd kernel: [ 23.050262] md: raid1 personality registered for level 1 Mar 21 17:39:34 sysresccd kernel: [ 23.233140] md: raid6 personality registered for level 6 Mar 21 17:39:34 sysresccd kernel: [ 23.233142] md: raid5 personality registered for level 5 Mar 21 17:39:34 sysresccd kernel: [ 23.233143] md: raid4 personality registered for level 4 Mar 21 17:39:34 sysresccd kernel: [ 23.237839] md: raid10 personality registered for level 10 Mar 21 17:39:38 sysresccd kernel: [ 173.559060] md: Autodetecting RAID arrays. Mar 21 17:39:38 sysresccd kernel: [ 173.559062] md: Scanned 0 and added 0 devices. Mar 21 17:39:38 sysresccd kernel: [ 173.559064] md: autorun ... Mar 21 17:39:38 sysresccd kernel: [ 173.559065] md: ... autorun DONE. Mar 22 14:52:19 sysresccd kernel: [76534.599922] md: nonpersistent superblock ... Mar 22 14:52:19 sysresccd kernel: [76534.599925] md: bind<sda> Mar 22 14:52:19 sysresccd kernel: [76534.599948] md: nonpersistent superblock ... Mar 22 14:52:19 sysresccd kernel: [76534.599949] md: bind<sdb> Mar 22 14:52:19 sysresccd kernel: [76534.600272] md: nonpersistent superblock ... Mar 22 14:52:19 sysresccd kernel: [76534.600275] md: bind<sdc> Mar 22 14:52:19 sysresccd kernel: [76534.607604] md/raid0:md0: looking at sdc Mar 22 14:52:19 sysresccd kernel: [76534.607607] md/raid0:md0: comparing sdc(488397056) with sdc(488397056) Mar 22 14:52:19 sysresccd kernel: [76534.607609] md/raid0:md0: END Mar 22 14:52:19 sysresccd kernel: [76534.607611] md/raid0:md0: ==> UNIQUE Mar 22 14:52:19 sysresccd kernel: [76534.607612] md/raid0:md0: 1 zones Mar 22 14:52:19 sysresccd kernel: [76534.607614] md/raid0:md0: looking at sdb Mar 22 14:52:19 sysresccd kernel: [76534.607616] md/raid0:md0: comparing sdb(488397056) with sdc(488397056) Mar 22 14:52:19 sysresccd kernel: [76534.607618] md/raid0:md0: EQUAL Mar 22 14:52:19 sysresccd kernel: [76534.607620] md/raid0:md0: looking at sda Mar 22 14:52:19 sysresccd kernel: [76534.607621] md/raid0:md0: comparing sda(488397056) with sdc(488397056) Mar 22 14:52:19 sysresccd kernel: [76534.607624] md/raid0:md0: EQUAL Mar 22 14:52:19 sysresccd kernel: [76534.607625] md/raid0:md0: FINAL 1 zones Mar 22 14:52:19 sysresccd kernel: [76534.607628] md/raid0:md0: done. Mar 22 14:52:19 sysresccd kernel: [76534.607630] md/raid0:md0: md_size is 1465191168 sectors. Mar 22 14:52:19 sysresccd kernel: [76534.607632] ******* md0 configuration ********* Mar 22 14:52:19 sysresccd kernel: [76534.607648] md0: detected capacity change from 0 to 750177878016 Mar 22 14:52:19 sysresccd kernel: [76534.609770] md0: detected capacity change from 0 to 750177878016 Mar 22 14:52:19 sysresccd kernel: [76534.609778] md0: Mar 22 15:26:22 sysresccd kernel: [78577.652324] md0: detected capacity change from 750177878016 to 0 Mar 22 15:26:22 sysresccd kernel: [78577.652329] md: md0 stopped. Mar 22 15:26:22 sysresccd kernel: [78577.652333] md: unbind<sdc> Mar 22 15:26:22 sysresccd kernel: [78577.655069] md: export_rdev(sdc) Mar 22 15:26:22 sysresccd kernel: [78577.655081] md: unbind<sdb> Mar 22 15:26:22 sysresccd kernel: [78577.655096] md: export_rdev(sdb) Mar 22 15:26:22 sysresccd kernel: [78577.655107] md: unbind<sda> Mar 22 15:26:22 sysresccd kernel: [78577.657053] md: export_rdev(sda) Mar 22 15:27:17 sysresccd kernel: [78632.225970] md: nonpersistent superblock ... Mar 22 15:27:17 sysresccd kernel: [78632.225974] md: bind<sda1> Mar 22 15:27:17 sysresccd kernel: [78632.225999] md: nonpersistent superblock ... Mar 22 15:27:17 sysresccd kernel: [78632.226001] md: bind<sdb1> Mar 22 15:27:17 sysresccd kernel: [78632.226023] md: nonpersistent superblock ... Mar 22 15:27:17 sysresccd kernel: [78632.226025] md: bind<sdc1> Mar 22 15:27:17 sysresccd kernel: [78632.228219] md/raid0:md0: looking at sdc1 Mar 22 15:27:17 sysresccd kernel: [78632.228221] md/raid0:md0: comparing sdc1(488391936) with sdc1(488391936) Mar 22 15:27:17 sysresccd kernel: [78632.228224] md/raid0:md0: END Mar 22 15:27:17 sysresccd kernel: [78632.228225] md/raid0:md0: ==> UNIQUE Mar 22 15:27:17 sysresccd kernel: [78632.228227] md/raid0:md0: 1 zones Mar 22 15:27:17 sysresccd kernel: [78632.228229] md/raid0:md0: looking at sdb1 Mar 22 15:27:17 sysresccd kernel: [78632.228231] md/raid0:md0: comparing sdb1(488391936) with sdc1(488391936) Mar 22 15:27:17 sysresccd kernel: [78632.228233] md/raid0:md0: EQUAL Mar 22 15:27:17 sysresccd kernel: [78632.228235] md/raid0:md0: looking at sda1 Mar 22 15:27:17 sysresccd kernel: [78632.228237] md/raid0:md0: comparing sda1(488391936) with sdc1(488391936) Mar 22 15:27:17 sysresccd kernel: [78632.228239] md/raid0:md0: EQUAL Mar 22 15:27:17 sysresccd kernel: [78632.228241] md/raid0:md0: FINAL 1 zones Mar 22 15:27:17 sysresccd kernel: [78632.228244] md/raid0:md0: done. Mar 22 15:27:17 sysresccd kernel: [78632.228246] md/raid0:md0: md_size is 1465175808 sectors. Mar 22 15:27:17 sysresccd kernel: [78632.228248] ******* md0 configuration ********* Mar 22 15:27:17 sysresccd kernel: [78632.228264] md0: detected capacity change from 0 to 750170013696 Mar 22 15:27:17 sysresccd kernel: [78632.229357] md0: detected capacity change from 0 to 750170013696 Mar 22 15:27:17 sysresccd kernel: [78632.229364] md0: unknown partition table Mar 22 15:29:21 sysresccd kernel: [78756.740476] md0: detected capacity change from 750170013696 to 0 Mar 22 15:29:21 sysresccd kernel: [78756.740481] md: md0 stopped. Mar 22 15:29:21 sysresccd kernel: [78756.740485] md: unbind<sdc1> Mar 22 15:29:21 sysresccd kernel: [78756.740503] md: export_rdev(sdc1) Mar 22 15:29:21 sysresccd kernel: [78756.740515] md: unbind<sdb1> Mar 22 15:29:21 sysresccd kernel: [78756.743149] md: export_rdev(sdb1) Mar 22 15:29:21 sysresccd kernel: [78756.743161] md: unbind<sda1> Mar 22 15:29:21 sysresccd kernel: [78756.743175] md: export_rdev(sda1) Mar 22 16:02:04 sysresccd kernel: [80719.752982] md: nonpersistent superblock ... Mar 22 16:02:04 sysresccd kernel: [80719.752986] md: bind<sda1> Mar 22 16:02:04 sysresccd kernel: [80719.753011] md: nonpersistent superblock ... Mar 22 16:02:04 sysresccd kernel: [80719.753013] md: bind<sdb1> Mar 22 16:02:04 sysresccd kernel: [80719.753034] md: nonpersistent superblock ... Mar 22 16:02:04 sysresccd kernel: [80719.753036] md: bind<sdc1> Mar 22 16:02:04 sysresccd kernel: [80719.755405] md/raid0:md0: looking at sdc1 Mar 22 16:02:04 sysresccd kernel: [80719.755408] md/raid0:md0: comparing sdc1(488391936) with sdc1(488391936) Mar 22 16:02:04 sysresccd kernel: [80719.755410] md/raid0:md0: END Mar 22 16:02:04 sysresccd kernel: [80719.755412] md/raid0:md0: ==> UNIQUE Mar 22 16:02:04 sysresccd kernel: [80719.755413] md/raid0:md0: 1 zones Mar 22 16:02:04 sysresccd kernel: [80719.755415] md/raid0:md0: looking at sdb1 Mar 22 16:02:04 sysresccd kernel: [80719.755417] md/raid0:md0: comparing sdb1(488391936) with sdc1(488391936) Mar 22 16:02:04 sysresccd kernel: [80719.755419] md/raid0:md0: EQUAL Mar 22 16:02:04 sysresccd kernel: [80719.755421] md/raid0:md0: looking at sda1 Mar 22 16:02:04 sysresccd kernel: [80719.755423] md/raid0:md0: comparing sda1(488391936) with sdc1(488391936) Mar 22 16:02:04 sysresccd kernel: [80719.755426] md/raid0:md0: EQUAL Mar 22 16:02:04 sysresccd kernel: [80719.755427] md/raid0:md0: FINAL 1 zones Mar 22 16:02:04 sysresccd kernel: [80719.755430] md/raid0:md0: done. Mar 22 16:02:04 sysresccd kernel: [80719.755432] md/raid0:md0: md_size is 1465175808 sectors. Mar 22 16:02:04 sysresccd kernel: [80719.755434] ******* md0 configuration ********* Mar 22 16:02:04 sysresccd kernel: [80719.755451] md0: detected capacity change from 0 to 750170013696 Mar 22 16:02:04 sysresccd kernel: [80719.757166] md0: detected capacity change from 0 to 750170013696 Mar 22 16:02:04 sysresccd kernel: [80719.757173] md0: unknown partition table Mar 22 16:06:58 sysresccd kernel: [81013.212365] md0: detected capacity change from 750170013696 to 0 Mar 22 16:06:58 sysresccd kernel: [81013.212370] md: md0 stopped. Mar 22 16:06:58 sysresccd kernel: [81013.212375] md: unbind<sdc1> Mar 22 16:06:58 sysresccd kernel: [81013.219008] md: export_rdev(sdc1) Mar 22 16:06:58 sysresccd kernel: [81013.219020] md: unbind<sdb1> Mar 22 16:06:58 sysresccd kernel: [81013.222008] md: export_rdev(sdb1) Mar 22 16:06:58 sysresccd kernel: [81013.222018] md: unbind<sda1> Mar 22 16:06:58 sysresccd kernel: [81013.226647] md: export_rdev(sda1) Mar 22 16:07:28 sysresccd kernel: [81043.831869] md: nonpersistent superblock ... Mar 22 16:07:28 sysresccd kernel: [81043.831873] md: bind<sda1> Mar 22 16:07:28 sysresccd kernel: [81043.832175] md: nonpersistent superblock ... Mar 22 16:07:28 sysresccd kernel: [81043.832177] md: bind<sdb1> Mar 22 16:07:28 sysresccd kernel: [81043.832200] md: nonpersistent superblock ... Mar 22 16:07:28 sysresccd kernel: [81043.832202] md: bind<sdc1> Mar 22 16:07:28 sysresccd kernel: [81043.833778] md/raid0:md0: looking at sdc1 Mar 22 16:07:28 sysresccd kernel: [81043.833781] md/raid0:md0: comparing sdc1(488391936) with sdc1(488391936) Mar 22 16:07:28 sysresccd kernel: [81043.833784] md/raid0:md0: END Mar 22 16:07:28 sysresccd kernel: [81043.833785] md/raid0:md0: ==> UNIQUE Mar 22 16:07:28 sysresccd kernel: [81043.833787] md/raid0:md0: 1 zones Mar 22 16:07:28 sysresccd kernel: [81043.833788] md/raid0:md0: looking at sdb1 Mar 22 16:07:28 sysresccd kernel: [81043.833790] md/raid0:md0: comparing sdb1(488391936) with sdc1(488391936) Mar 22 16:07:28 sysresccd kernel: [81043.833793] md/raid0:md0: EQUAL Mar 22 16:07:28 sysresccd kernel: [81043.833794] md/raid0:md0: looking at sda1 Mar 22 16:07:28 sysresccd kernel: [81043.833796] md/raid0:md0: comparing sda1(488391936) with sdc1(488391936) Mar 22 16:07:28 sysresccd kernel: [81043.833799] md/raid0:md0: EQUAL Mar 22 16:07:28 sysresccd kernel: [81043.833800] md/raid0:md0: FINAL 1 zones Mar 22 16:07:28 sysresccd kernel: [81043.833803] md/raid0:md0: done. Mar 22 16:07:28 sysresccd kernel: [81043.833805] md/raid0:md0: md_size is 1465175808 sectors. Mar 22 16:07:28 sysresccd kernel: [81043.833807] ******* md0 configuration ********* Mar 22 16:07:28 sysresccd kernel: [81043.833823] md0: detected capacity change from 0 to 750170013696 Mar 22 16:07:28 sysresccd kernel: [81043.835806] md0: detected capacity change from 0 to 750170013696 Mar 22 16:07:28 sysresccd kernel: [81043.835813] md0: unknown partition table Mar 22 16:08:07 sysresccd kernel: [81082.737453] md0: detected capacity change from 750170013696 to 0 Mar 22 16:08:07 sysresccd kernel: [81082.737457] md: md0 stopped. Mar 22 16:08:07 sysresccd kernel: [81082.737461] md: unbind<sdc1> Mar 22 16:08:07 sysresccd kernel: [81082.737479] md: export_rdev(sdc1) Mar 22 16:08:07 sysresccd kernel: [81082.737491] md: unbind<sdb1> Mar 22 16:08:07 sysresccd kernel: [81082.740149] md: export_rdev(sdb1) Mar 22 16:08:07 sysresccd kernel: [81082.740160] md: unbind<sda1> Mar 22 16:08:07 sysresccd kernel: [81082.740175] md: export_rdev(sda1) Various sources indicate the following syntax to build a windows raid array: "mdadm --build -l 0 -n <number of devices> -c 64 <md name> <space-separated device list>" with one source¹ mentioning a successful build from scratch (which unfortunately I cannot do right now) in the linux source tree, Documentation/ldm.txt looks quite old and also some aging files are present in linux-ntfs sourceforge download area. What is the official ldm status under current linux kernel? And if raid 0 is supported, what am I doing wrong? Thank you. ___ ¹ http://kubuntuforums.net/forums/index.php?topic=3103856.0 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
