Hi,
everything seems to work fine, but what do think of the confusing
output below (Sorry for the length of it!)? I tried fdisk and sfdisk,
and both yield different results. Cfdisk even refused to write
partition tables to sde and sdf, giving only 'Illegal command' as an
error message.
The disks sda to sdd are real SCSI disks, sde and sdf are SATA
disks.
Do I have to worry about loosing data?
BTW, the performance is questionable. Running Quake4 from a RAID1
partition appears to be less fluent than running it from a non-RAID
SCSI disk. Percieved speed when reading and writing data from a SATA
RAID1 is the same as when reading from a single SCSI disk. I would
have expected a RAID1 on modern disks to be noticeably faster than a
single non-RAID, about 6 or 7 years old SCSI disk at least when
reading, though. But it seems that SATA is still too much like IDE
... So SATA is something I won't recommend unless a hardware RAID
controller is being used. Disks really become a bottleneck.
yun:/home/lee# fdisk -l
Disk /dev/sda: 36.7 GB, 36703918080 bytes
255 heads, 63 sectors/track, 4462 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 62 497983+ 83 Linux
/dev/sda2 63 125 506047+ 82 Linux swap / Solaris
/dev/sda3 126 1462 10739452+ 83 Linux
/dev/sda4 1463 4462 24097500 5 Extended
/dev/sda5 1463 2678 9767488+ 83 Linux
/dev/sda6 2679 3894 9767488+ 83 Linux
/dev/sda7 3895 4462 4562428+ 83 Linux
Disk /dev/sdb: 18.3 GB, 18360785920 bytes
64 heads, 32 sectors/track, 17510 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 513 525296 82 Linux swap / Solaris
/dev/sdb2 514 17510 17404928 83 Linux
Disk /dev/sdc: 18.3 GB, 18351959040 bytes
64 heads, 32 sectors/track, 17501 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 513 525296 82 Linux swap / Solaris
/dev/sdc2 514 17501 17395712 83 Linux
Disk /dev/sdd: 36.7 GB, 36748945408 bytes
64 heads, 32 sectors/track, 35046 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 1 1025 1049584 82 Linux swap / Solaris
/dev/sdd2 1026 4098 3146752 83 Linux
/dev/sdd3 4099 4611 525312 83 Linux
/dev/sdd4 4612 35046 31165424+ 5 Extended
/dev/sdd5 4612 14852 10486768 83 Linux
/dev/sdd6 14853 35046 20678640 83 Linux
Disk /dev/sde: 300.0 GB, 300090728448 bytes
255 heads, 63 sectors/track, 36483 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sde1 1 9119 73248336 fd Linux raid autodetect
/dev/sde2 9120 29788 166023742+ fd Linux raid autodetect
/dev/sde3 29789 36483 53777587+ fd Linux raid autodetect
Disk /dev/sdf: 300.0 GB, 300090728448 bytes
255 heads, 63 sectors/track, 36483 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdf1 1 9119 73248336 fd Linux raid autodetect
/dev/sdf2 9120 29788 166023742+ fd Linux raid autodetect
/dev/sdf3 29789 36483 53777587+ fd Linux raid autodetect
Disk /dev/md0: 75.0 GB, 75006214144 bytes
2 heads, 4 sectors/track, 18312064 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md2: 55.0 GB, 55068131328 bytes
2 heads, 4 sectors/track, 13444368 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md2 doesn't contain a valid partition table
Disk /dev/md1: 170.0 GB, 170008182784 bytes
2 heads, 4 sectors/track, 41505904 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
Disk /dev/md1 doesn't contain a valid partition table
yun:/home/lee#
yun:/home/lee# sfdisk -l
Disk /dev/sda: 4462 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sda1 * 0+ 61 62- 497983+ 83 Linux
/dev/sda2 62 124 63 506047+ 82 Linux swap / Solaris
/dev/sda3 125 1461 1337 10739452+ 83 Linux
/dev/sda4 1462 4461 3000 24097500 5 Extended
/dev/sda5 1462+ 2677 1216- 9767488+ 83 Linux
/dev/sda6 2678+ 3893 1216- 9767488+ 83 Linux
/dev/sda7 3894+ 4461 568- 4562428+ 83 Linux
Disk /dev/sdb: 17510 cylinders, 64 heads, 32 sectors/track
Units = cylinders of 1048576 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sdb1 0+ 512 513- 525296 82 Linux swap / Solaris
/dev/sdb2 513 17509 16997 17404928 83 Linux
/dev/sdb3 0 - 0 0 0 Empty
/dev/sdb4 0 - 0 0 0 Empty
Disk /dev/sdc: 17501 cylinders, 64 heads, 32 sectors/track
Units = cylinders of 1048576 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sdc1 0+ 512 513- 525296 82 Linux swap / Solaris
/dev/sdc2 513 17500 16988 17395712 83 Linux
/dev/sdc3 0 - 0 0 0 Empty
/dev/sdc4 0 - 0 0 0 Empty
Disk /dev/sdd: 35046 cylinders, 64 heads, 32 sectors/track
Warning: extended partition does not start at a cylinder boundary.
DOS and Linux will interpret the contents differently.
Units = cylinders of 1048576 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sdd1 0+ 1024 1025- 1049584 82 Linux swap / Solaris
/dev/sdd2 1025 4097 3073 3146752 83 Linux
/dev/sdd3 4098 4610 513 525312 83 Linux
/dev/sdd4 4611+ 35045 30435- 31165424+ 5 Extended
start: (c,h,s) expected (1023,63,32) found (587,209,38)
/dev/sdd5 4611+ 14851 10241- 10486768 83 Linux
/dev/sdd6 14852+ 35045 20194- 20678640 83 Linux
Disk /dev/sde: 36483 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sde1 0+ 9118 9119- 73248336 fd Linux raid autodetect
/dev/sde2 9119 29787 20669 166023742+ fd Linux raid autodetect
/dev/sde3 29788 36482 6695 53777587+ fd Linux raid autodetect
/dev/sde4 0 - 0 0 0 Empty
Disk /dev/sdf: 36483 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sdf1 0+ 9118 9119- 73248336 fd Linux raid autodetect
/dev/sdf2 9119 29787 20669 166023742+ fd Linux raid autodetect
/dev/sdf3 29788 36482 6695 53777587+ fd Linux raid autodetect
/dev/sdf4 0 - 0 0 0 Empty
Disk /dev/md0: 18312064 cylinders, 2 heads, 4 sectors/track
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/md0: unrecognized partition table type
No partitions found
Disk /dev/md2: 13444368 cylinders, 2 heads, 4 sectors/track
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/md2: unrecognized partition table type
No partitions found
Disk /dev/md1: 41505904 cylinders, 2 heads, 4 sectors/track
sfdisk: ERROR: sector 0 does not have an msdos signature
/dev/md1: unrecognized partition table type
No partitions found
yun:/home/lee#
yun:/home/lee# cat /proc/mdstat
Personalities : [raid1] [multipath]
md1 : active raid1 sdf2[1] sde2[0]
166023616 blocks [2/2] [UU]
md2 : active raid1 sdf3[1] sde3[0]
53777472 blocks [2/2] [UU]
md0 : active raid1 sdf1[1] sde1[0]
73248256 blocks [2/2] [UU]
unused devices: <none>
yun:/home/lee#
GH
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