Setup a SVM mirror in Solaris 10

Part Tag Flag Cylinders Size Blocks
0 root wm 70 – 1143 8.23GB (1074/0/0) 17253810
1 swap wu 3 – 69 525.56MB (67/0/0) 1076355
2 backup wm 0 – 1170 8.97GB (1171/0/0) 18812115
3 unassigned wu 0 0 (0/0/0) 0
4 unassigned wu 0 0 (0/0/0) 0
5 unassigned wu 0 0 (0/0/0) 0
6 unassigned wu 0 0 (0/0/0) 0
7 home wm 1144 – 1170 211.79MB (27/0/0) 433755
8 boot wu 0 – 0 7.84MB (1/0/0) 16065
9 alternates wu 1 – 2 15.69MB (2/0/0) 32130

Partition 0 is /
Partition 1 is swap
Partition 8 is /boot
Partition 9 is where metadevice state database

metadb -a -f -c3 /dev/dsk/c0d0s9

# metainit -f d12 1 1 c0d0s0

# metainit -f d12 1 1 c0d0s1

# metainit -f d12 1 1 c0d0s8

# metastat -p

# metainit d10 -m d12

# metaroot d10

# metainit d20 -m d22

# metainit d30 -m d32

# shutdown -y -g0 -i6

Then create the metadevices for the other side of the mirror and attach them

metainit -f d11 1 1 c0d1s0
metainit -f d21 1 1 c0d1s1
metainit -f d31 1 1 c0d1s8

metattach d10 d11
metattach d20 d21
metattach d30 d31

metadb -a -f -c3 /dev/dsk/c0d1s9

Solaris Volume Manager (SVM) x86 How to Replace a Failed, SCSI Disk, Mirrored with SVM

Verify failed disk (in this example, c1t0d0 is the failed disk)

# metastat -c

#format

#tail /var/adm/messages

# metastat -c (We can see that the disk is no longer an active member of the mirror.)

 

Remove failed disk from existing mirror group

# metadetach <mirror> <submirror>

# iostat -iEn c1t0d0

#cfgadm -al

# cfgadm -c unconfigure c1::dsk/c1t0d0

Maybe there is a need to delete the metadb with ‘metadb -d c1t0d0s7’ before ‘cfgadm -c unconfigure …’ can complete.

This command will remove the block and character (raw) device nodes the symbolic links in /dev/[r]dsk point to.

Physically replace the disk. Configure the new disk back into Solaris.

# cfgadm -c configure c1::dsk/c1t0d0

# ls -lL /dev/dsk/c1t0d0s* <— check the device nodes
# ls -lL /dev/rdsk/c1t0d0s*

# format

# iostat -iEn c1t0d0

if boot disk, run below:
# fdisk -b /usr/lib/fs/ufs/mboot /dev/rdsk/c1t0d0p0

if not, run below:
# fdisk /dev/rdsk/c1t0d0p0
# prtvtoc /dev/rdsk/c1t1d0s2 | fmthard -s – /dev/rdsk/c1t0d0s2
# /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c1t0d0s0
# metadb
# metadb -d /dev/dsk/c1t0d0s7 <—-remove old metadb replicas
# metadb -a -c3 /dev/dsk/c1t0d0s7 <—re-add new metadb replicas
# metadb
# metadevadm -u c1t0d0

#metainit -f d11 1 1 c1t0d0s0
#metainit -f d21 1 1 c1t0d0s1
#metainit -f d31 1 1 c1t0d0s3

#metattach d10 d11
#metattach d20 d21
#metattach d30 d31

#metastat -c     (below is the sample output)

d20        m 525MB d22 d21 (resync-19%)
d22 s 525MB c0d0s1
d21 s 525MB c0d1s1
d30        m 211MB d32 d31 (resync-33%)
d32 s 211MB c0d0s7
d31 s 211MB c0d1s7
d10       m 8.2GB d12 d11 (resync-0%)
d12 s 8.2GB c0d0s0
d11 s 8.2GB c0d1s0

Brief of WLAN

1.0)     What Is the Meaning of WLAN?

Wireless Local Area Networks or WLAN have been rapidly growing and getting a lot of interest from numerous people whether it was noticed or not. Basically, WLAN has been initiated by a cellular spectrum technology that being evolve to become friendly network connections. It helps us to minimize the physical wiring in designing the networks and indirectly reduce the cost of development. In spite of that, there were always been a pros and contras in terms of various criteria such as performance, data rates, and so forth need to be elaborate so we will get this things clearer. Therefore, the brief of architecture and along with its challenges faced by utilizing WLAN will be discussed in the next paragraph.

1.1)      When It Was Started?

Officially, IEEE has created a standard approach for wireless technology for the usage of enterprise, home and public on 1997. However, there was some claim said that the research and study of this wireless LAN has been started earlier.

Kevin J. Negus and Al Petrick in “History of Wireless Local Area Networks (WLANs) in the Unlicensed Bands”, George Mason University Law School Conference, Information Economy Project, Arlington, in 2008 have mentioned in that article the first product of WLAN was the Telesystems “ARLAN-SST” (circa 1988) in 1988. [8]

1.2)      How the Term Wi-Fi Get In Place?

There was no solid evidence the term “wifi” is owned by any organization. The only close to truth owner of the term “wifi” was from the WECA that chosen “WI-FI” on 802.11b Direct Sequence in 1999 and patented it as “WI-FI” [1] that including the computer hardware, namely, wireless local area networking products in class A However, Cory Doctorow [2] in his blog boingboing.net has stated that Phil Belanger, a founding member of the Wi-Fi Alliance who presided over the selection of the name “Wi-Fi” writes:

“Wi-Fi doesn’t stand for anything. It is not an acronym. There is no meaning.

Wi-Fi and the ying yang style logo were invented by Interbrand. We (the founding members of the Wireless Ethernet Compatibility Alliance, now called the Wi-Fi Alliance) hired Interbrand to come up with the name and logo that we could use for our interoperability seal and marketing efforts. We needed something that was a little catchier than “IEEE 802.11b Direct Sequence”.