1. Windows Azure Drive
Pavlo Revenkov
EPAM Cloud Computing Competency Center
Email: pavlo_revenkov@epam.com
Skype: rp_risingstar
Habrahabr: habrahabr.ru/users/risingstar/

2. Data management services
2
Web-role Worker-role
Worker-role
Worker-role
Web-role
Drive
SQL Azure
Blobs
Tables
Queues

3. Example: CMS
3
Publishers
Instance 1
Author
Instance 2
Instance 3
Mount
30 minutes
Snapshot
Repository
Instance 4

4. Windows Azure Drive
4
Subscription
Storage Account
(100 ТВ)
Storage Account
(100 ТВ)
Container
Block Blob (200 GB)
Container
Page Blob (1 ТВ)
Storage Account
(100 ТВ)
Storage Account
(100 ТВ)
…
Container
…
Azure Drive (1 ТВ)
…

5. Blob content upload
var storageAccount = CloudStorageAccount.Parse(
ConfigurationManager
.ConnectionStrings[ConnectionStringSetting]
.ConnectionString);
var blobClient = storageAccount.CreateCloudBlobClient();
var container = blobClient.GetContainerReference(containerName);
var pageBlob = container.GetPageBlobReference(blobName);
using (var fileStream = new FileStream(filePath, FileMode.Open)) {
pageBlob.Create(fileStream.Length);
var buffer = new byte[partSize];
while (offset < fileStream.Length) {
var bytesRead = fileStream.Read(buffer, 0, partSize);
pageBlob.WritePages(new MemoryStream(buffer, 0, bytesRead), offset);
offset += bytesRead;
}
}
5

6. 1. public static void UploadVHDFile(string filePath, string containerName, string blobName)
2. {
3.
const int partSize = 1024 * 1024;
4.
5.
var storageAccount = CloudStorageAccount.Parse(
6.
ConfigurationManager.ConnectionStrings[ConnectionStringSetting].ConnectionString);
7.
8.
var blobClient = storageAccount.CreateCloudBlobClient();
9.
var container = blobClient.GetContainerReference(containerName);
10.
container.CreateIfNotExist();
11.
12.
var pageBlob = container.GetPageBlobReference(blobName);
13.
pageBlob.DeleteIfExists();
14.
pageBlob.Properties.ContentType = "binary/octet-stream";
15.
16.
using (var fileStream = new FileStream(filePath, FileMode.Open))
17.
{
18.
int offset = 0;
19.
20.
pageBlob.Create(fileStream.Length);
21.
22.
var buffer = new byte[partSize];
23.
while (offset < fileStream.Length)
24.
{
25.
var bytesRead = fileStream.Read(buffer, 0, partSize);
26.
27.
pageBlob.WritePages(new MemoryStream(buffer, 0, bytesRead), offset);
28.
29.
offset += bytesRead;
30.
31.
Console.Write('.');
32.
}
33.
}
34. }
6

7. Modes
7
CloudDrive
client
Snapshot
URL
Mount
Exception
Mount
Yes
Author
Lease mode
Snapshot mode
read
write
read
Windows Azure
Drive
Publisher

8. Workflow
var account = CloudStorageAccount.Parse(
ConfigurationManager.AppSettings["ConnectionString“]);
var drive = new CloudDrive(blobUri, account.Credentials.*);
try
{
drive.Mount(0, DriveMountOptions.None);
...
}
catch (CloudDriveException e)
{
drive = new CloudDrive(new Uri(drive.Snapshot().AbsoluteUri), ...);
drive.Mount(0, DriveMountOptions.None);
}
finally
{
drive.Unmount();
}
8

9. Demo
9

10. References
Differences Between the Storage Emulator and
Windows Azure Storage Services
 http://msdn.microsoft.com/en-us/gg433135
Windows Azure Drive whitepaper
 http://go.microsoft.com/?linkid=9710117
10

11. Questions?
11