hello, folks !
as follow , it's our product enviroment a server that include many of disk, raid and storage, who can explain what's mean of disk information ?


[root@server ~]#fdisk -l

Disk /dev/sda: 1090 MB, 1090519040 bytes
34 heads, 62 sectors/track, 1010 cylinders
Units = cylinders of 2108 * 512 = 1079296 bytes

Disk /dev/sda doesn't contain a valid partition table

Disk /dev/sdb: 544.6 GB, 544680706048 bytes
255 heads, 63 sectors/track, 66220 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdb doesn't contain a valid partition table

Disk /dev/sdc: 1090 MB, 1090519040 bytes
34 heads, 62 sectors/track, 1010 cylinders
Units = cylinders of 2108 * 512 = 1079296 bytes

Disk /dev/sdc doesn't contain a valid partition table

Disk /dev/sdd: 544.6 GB, 544680706048 bytes
255 heads, 63 sectors/track, 66220 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/sdd doesn't contain a valid partition table

Disk /dev/cciss/c0d0: 146.7 GB, 146778685440 bytes
255 heads, 63 sectors/track, 17844 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/cciss/c0d0p1 * 1 13 104391 83 Linux
/dev/cciss/c0d0p2 14 1057 8385930 82 Linux swap / Solaris
/dev/cciss/c0d0p3 1058 17844 134841577+ 83 Linux

Disk /dev/dm-0: 1090 MB, 1090519040 bytes
255 heads, 63 sectors/track, 132 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-0 doesn't contain a valid partition table

Disk /dev/dm-1: 544.6 GB, 544680706048 bytes
255 heads, 63 sectors/track, 66220 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/dm-1 doesn't contain a valid partition table


[root@server ~]#mount -l
/dev/cciss/c0d0p3 on / type ext3 (rw) [/]
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/cciss/c0d0p1 on /boot type ext3 (rw) [/boot]
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
/dev/mapper/mpath1 on /mysql type ext3 (rw)

I think you are asking a software RAID question that would be answered well only by a software RAID expert.

You might get the attention of a software RAID expert more easily if you edited the thread title to say "Software RAID question" (edit first post of thread and press the ADVANCED button).

We can see four physical drives, each of which can be looked at individually by fdisk, but they are not partitioned individually (they are part of a software RAID) so fdisk cannot see the partitioning.

I think we see two different kinds of RAID running making three devices:
cciss/c0d0
dm-0
dm-1

Only cciss/c0d0 appears to contain valid partitions and it seems to be a small part of your total disk space.

Beyond that, I don't have nearly the software RAID expertise needed to give useful info. I would guess that what you have has been set up quite incorrectly, but I'm not even certain of that.

I'm pretty sure dm-0 and dm-1 are software RAID and they might be RAID-1 using up all the drives sda through sdd. That may mean cciss/c0d0 is hardware RAID and we can't see the underlying raw drives through fdisk. Then dm-0 and dm-1 (which represent the four physical drives we see) haven't been partitioned nor used.

Do you know what physical drives you have in the system? I can't be sure that dm-0 and dm-1 aren't incorrect views of drives that are in use some other way (some or all of them may be the drives underlying cciss/c0d0).

I'm also wondering what sda and sdc might be other than useless obsolete garbage. I assume the MB where one would expect GB is not a typo.