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這次干活，服務(wù)器硬盤26T，但是發(fā)現(xiàn)無論是Ubuntu11.04還是Centos5.6，都是無法直接分配一個分區(qū)超過16T. 沒想到，linux還有這個局限。改天好好研究一下這個。 2011年03月19日 星期六 17:18本次操作環(huán)境： Ubuntu Server 10.10 SCSI Harddisk：/dev/sda 500GB U盤：/dev/sdb 8GB（模擬成USB Harddisk，安裝OS）
介紹2種分區(qū)表：
MBR分區(qū)表：（MBR含義：主引導(dǎo)記錄）
所支持的最大卷：2T （T; terabytes,1TB=1024GB）
對分區(qū)的設(shè)限：最多4個主分區(qū)或3個主分區(qū)加一個擴展分區(qū)。
GPT分區(qū)表：（GPT含義：GUID分區(qū)表）
支持最大卷：18EB，（E：exabytes,1EB=1024TB）
每個磁盤最多支持128個分區(qū) 所以如果要大于2TB的卷或分區(qū)就必須得用GPT分區(qū)表。 Linux下fdisk工具不支持GPT，得使用另一個GNU發(fā)布的強大分區(qū)工具parted。 fdisk工具用的話，會有下面的警告信息： WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted. 下面是用parted工具對/dev/sda做GPT分區(qū)的過程： root@node01:/mnt# parted /dev/sda
GNU Parted 2.3
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) mklabel gpt
Warning: The existing disk label on /dev/sda will be destroyed and all data on this disk
will be lost. Do you want to continue?
Yes/No? yes (parted) print
Model: DELL PERC 6/i Adapter (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags (parted)mkpart primary 0KB 500GB
Warning: You requested a partition from 0.00B to 500GB.
The closest location we can manage is 17.4kB to 500GB.
Is this still acceptable to you?
Yes/No? yes
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? Ignore (parted) print
Model: DELL PERC 6/i Adapter (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 17.4kB 500GB 500GB primary (parted)quit
Information: You may need to update /etc/fstab.
root@node01:/#fdisk -l
WARNING: GPT (GUID Partition Table) detected on '/dev/sda'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/sda: 499.6 GB, 499558383616 bytes
255 heads, 63 sectors/track, 60734 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sda1 1 60735 487849983+ ee GPT
root@node01:/#mkfs.ext4 /dev/sda1
mke2fs 1.41.12 (17-May-2010)
文件系統(tǒng)標(biāo)簽=
操作系統(tǒng):Linux
塊大小=4096 (log=2)
分塊大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
30490624 inodes, 121962487 blocks
6098124 blocks (5.00%) reserved for the super user
第一個數(shù)據(jù)塊=0
Maximum filesystem blocks=4294967296
3722 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968,
102400000
正在寫入inode表: 完成
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成
This filesystem will be automatically checked every 24 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override. root@node01:/#mount /dev/sda1 /export/glusterfs01/
root@node01:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/node01-root
6.8G 987M 5.5G 16% /
none 7.9G 208K 7.9G 1% /dev
none 7.9G 0 7.9G 0% /dev/shm
none 7.9G 32K 7.9G 1% /var/run
none 7.9G 0 7.9G 0% /var/lock
/dev/sdb1 228M 21M 196M 10% /boot
/dev/sda1 458G 198M 435G 1% /export/glusterfs01
root@node01:/#vi /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid -o value -s UUID' to print the universally unique identifier
# for a device; this may be used with UUID= as a more robust way to name
# devices that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
/dev/mapper/node01-root / ext4 errors=remount-ro 0 1
# /boot was on /dev/sdb1 during installation
UUID=c21707ff-ba0f-43ee-819a-8e72fa0f8500 /boot ext2 defaults 0 2
/dev/mapper/node01-swap_1 none swap sw 0 0
/dev/sda1 /export/glusterfs01 ext4 defaults 0 2
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