Breaking into our short OEM work I find I have to move it to some faster disk as a single Azure BLOB has a 500 IOPS limit. So we need to stripe a bunch of disks together.
To do this we first have to create them in Azure Control Panel ( I hate Powershell )
Click Attach Empty Disk at the bottom. We will do 15x10G disks
]
Repeat till 10 done !
now lets' install mdadm
[root@ebscloud ~]# yum install mdadm
Loaded plugins: refresh-packagekit
public_ol6_addons | 1.2 kB 00:00
public_ol6_addons/primary | 77 kB 00:00
public_ol6_addons 264/264
public_ol6_latest | 1.4 kB 00:00
public_ol6_latest/primary | 45 MB 00:03
public_ol6_latest 29084/29084
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package mdadm.x86_64 0:3.2.6-7.el6_5.2 will be updated
---> Package mdadm.x86_64 0:3.3-6.el6_6.1 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
=================================================================================================================================================================================
Package Arch Version Repository Size
=================================================================================================================================================================================
Updating:
mdadm x86_64 3.3-6.el6_6.1 public_ol6_latest 341 k
Transaction Summary
=================================================================================================================================================================================
Upgrade 1 Package(s)
Total download size: 341 k
Is this ok [y/N]: y
Downloading Packages:
mdadm-3.3-6.el6_6.1.x86_64.rpm | 341 kB 00:00
Running rpm_check_debug
Running Transaction Test
Transaction Test Succeeded
Running Transaction
Updating : mdadm-3.3-6.el6_6.1.x86_64 1/2
Cleanup : mdadm-3.2.6-7.el6_5.2.x86_64 2/2
Verifying : mdadm-3.3-6.el6_6.1.x86_64 1/2
Verifying : mdadm-3.2.6-7.el6_5.2.x86_64 2/2
Updated:
mdadm.x86_64 0:3.3-6.el6_6.1
Complete!
[root@ebscloud ~]#
[root@ebscloud ~]# fdisk -l|grep 10
Disk /dev/sda: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 26108 cylinders
/dev/sdc1 1 26108 209712478+ 83 Linux
Disk /dev/sdd: 10.7 GB, 10737418240 bytes
Disk /dev/sde: 10.7 GB, 10737418240 bytes
Disk /dev/sdg: 10.7 GB, 10737418240 bytes
Disk /dev/sdf: 10.7 GB, 10737418240 bytes
Disk /dev/sdj: 10.7 GB, 10737418240 bytes
Disk /dev/sdi: 10.7 GB, 10737418240 bytes
Disk /dev/sdl: 10.7 GB, 10737418240 bytes
Disk /dev/sdm: 10.7 GB, 10737418240 bytes
Disk /dev/sdk: 10.7 GB, 10737418240 bytes
Disk /dev/sdh: 10.7 GB, 10737418240 bytes
Disk /dev/sdn: 10.7 GB, 10737418240 bytes
[root@ebscloud ~]#
so those are the disks. Repeat for all 10
[root@ebscloud ~]# fdisk /dev/sdd
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe1519968.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305):
Using default value 1305
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ebscloud ~]#
etc
Now run mdadm --create /dev/md0 --verbose --level 0 --raid-devices 15 /dev/sdd1 /dev/sde1 /dev/sdg1 /dev/sdf1 /dev/sdj1 /dev/sdi1 /dev/sdl1 /dev/sdm1 /dev/sdk1 /dev/sdh1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe1519968.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content won't be recoverable.
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1305, default 1):
Using default value 1
Last cylinder, +cylinders or +size{K,M,G} (1-1305, default 1305):
Using default value 1305
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@ebscloud ~]#
etc
Now run mdadm --create /dev/md0 --verbose --level 0 --raid-devices 15 /dev/sdd1 /dev/sde1 /dev/sdg1 /dev/sdf1 /dev/sdj1 /dev/sdi1 /dev/sdl1 /dev/sdm1 /dev/sdk1 /dev/sdh1 /dev/sdn1 /dev/sdo1 /dev/sdp1 /dev/sdq1 /dev/sdr1
this will give you a Linux device /dev/md0
then do mkfs.ext4 on it and mount it in fstab .
Et Voila now you have a drive. ( if you've messed up and built Grid Control on a slow disk we will now give you several hours to push it all across to the new drive and then remap drives etc )
.. all done.. several Azure features were bumped into like no more than 16 attached disks etc
