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1. LVM 简单构架:
sda sdb sdc ...
PE01 PE02 PE03 PE04
VG01 ..
lv01 lv02 lv03 lv04 ..
DISK-->PE-->VG-->LV
2. LVM非常有用之处:
可以通过增加硬盘(PE)来增加VG,LV的容量。可以增加单个分区的容量,不受单颗硬盘容量限制。无需通硬件RAID来扩展容量。
3. LVM1.0 LVM2.0 差别(参考REDHAT DOC)
Features
LVM1
LVM2
RHEL AS 2.1 support
No
No
RHEL 3 support
Yes
No
RHEL 4 support
No
Yes
Transactional metadata for fast recovery
No
Yes
Shared volume mounts with GFS
No
Yes
Cluster Suite failover supported
Yes
Yes
Striped volume expansion
No
Yes
Max number PVs, LVs
256 PVs, 256 LVs
2**32 PVs, 2**32 LVs
Max device size
2 Terabytes
8 Exabytes (64-bit CPUs)
Volume mirroring support
No
Yes, in Fall 2005
Table 1. A comparison of LVM 1 and LVM 2
4. LVM 创建
例如本机有三块DISK ,sda sdb sdc.
本文来自ChinaUnix博客,如果查看原文请点:http://blog.chinaunix.net/u/18586/showart_2156478.html |
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