1. Windows Admins
K: човек, windows админите са
като сектанти
K: разказват ни какво ново в
exchange 2013 и споменават, че
вече management consola-та e
доста oрязана, и всичко се прави
през PowerShell... и залата
изпадна в потрес

2. 4 – Storage
LVM/SW RAID
Marian Marinov Borislav Varadinov
CEO of 1H Ltd. System Administrator
mm@1h.com bobi [ at ] itp.bg

3. Lame Vertical Move – LVM
Logical Volume Manager...
and why to complicate things?

4. LVM
Ицо
Радо
Лили
Роси
Митко
Светльо
Иван
Петко
Тишо

5. LVM
Ицо
Лили
Митко
Роси
Иван
Петко
Тишо

6. LVM

7. LVM

8. LVM Structure
➢ UUIDs
➢ Physical Extent (PE)
➢ Volume Groups (VG)
➢ max logical partitions
➢ max physical volumes
➢ PE size
➢ Logical Volume (LV)

9. Logical Volume
➢ Size (PEs or KB/MB/GB/TB)
➢ Stripe (2 < PE size)
N
➢ Mirror (multiple copies)
➢ Snapshot (typically around 15%-20% of
the original) chunk size (64KB –
1GB)
➢ Thin Provisioning
➢ RAID 1/4/5/6

10. LVM Commands
➢ pvcreate/display/remove
➢
vgcreate/display/remove/change
➢ lvcreate/display/remove
➢ Activate the LVM partitions
vgchange -a y

11. Linux Software RAID
➢ MD device
➢ Single command to rule them
all -
mdadm

12. Linux Software RAID
[root@beast ~]# cat /proc/mdstat
Personalities : [raid1]
md1 : active raid1 sdc3[1] sda3[0]
58605056 blocks [2/2] [UU]
md0 : active raid1 sde1[1]
976759936 blocks [2/1] [U_]
unused devices: <none>

13. Units Size
HDD – Sectors 512Bytes
HW RAID – Blocks 512B – 8MB
Partitions – Sectors 512B
(depending on the partition type)
n
SW RAID – Chunks 64KB – 1KB*2
PV – Physical Extents 8KB – 16GB
VG – Physical Extents n * PE
LV – Chunks 64KB – 1GB
FS – Blocks 1KB, 2KB, 4KB
(depending on the FS type)
Only the HDD is with static size,
everything else is with variable size.

14. Ext3 Ext4 Ext4 Ext4
LV-boot LV-main LV-usr LV-home
Volume 0 PV2 Volume 1
SW RAID
PV0 PV1 PV3
sda1 sda2 sda3 sdb1 sdb2
HW RAID
HDD HDD HDD

15. Ext4 Ext4
Ext3 Ext4 SW RAID
LV-boot LV-main LV-home0 LV-home1
Volume 0 Volume 1
PV0 PV1 PV2 PV3 PV4
sda1 sda2 sda3 sdb1 sdb2
HW RAID
HDD HDD HDD

16. Recovery?
➢ CGSecurity's TestDisk
➢ Download

17. DEMO

18. Links
LVM
http://www.linux-mag.com/id/7454/
SW RAID 0 vs LVM Striping
http://www.linux-mag.com/id/7582/
SW RAID HowTo
http://www.howtoforge.com/redundant-array-of-inexpe
LVM HowTo
http://www.howtoforge.com/linux_lvm

19. Storage – LVM/SW RAID
http://academy.telerik.com/student-courses/software-technologies/os-windows-linux/

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