public const int BackupBufferSizeLBA = 128; // there are about 180 contiguous free sectors in a private region
/// <summary>
/// Move extent to another disk
/// </summary>
public static void MoveExtentToAnotherDisk(List<DynamicDisk> disks, DynamicVolume volume, DynamicDiskExtent sourceExtent, DiskExtent relocatedExtent, ref long bytesCopied)
{
DiskGroupDatabase database = DiskGroupDatabase.ReadFromDisks(disks, volume.DiskGroupGuid);
if (database == null)
{
throw new DatabaseNotFoundException();
}
// copy the data
long transferSizeLBA = Settings.MaximumTransferSizeLBA;
for (long sectorIndex = 0; sectorIndex < relocatedExtent.TotalSectors; sectorIndex += transferSizeLBA)
{
long sectorsLeft = relocatedExtent.TotalSectors - sectorIndex;
int sectorsToRead = (int)Math.Min(transferSizeLBA, sectorsLeft);
byte[] data = sourceExtent.ReadSectors(sectorIndex, sectorsToRead);
relocatedExtent.WriteSectors(sectorIndex, data);
bytesCopied += sectorsToRead * sourceExtent.BytesPerSector;
}
// Update the database to point to the relocated extent
DynamicDisk targetDisk = DynamicDisk.ReadFromDisk(relocatedExtent.Disk);
DynamicDiskExtent dynamicRelocatedExtent = new DynamicDiskExtent(relocatedExtent, sourceExtent.ExtentID);
dynamicRelocatedExtent.Name = sourceExtent.Name;
dynamicRelocatedExtent.DiskGuid = targetDisk.DiskGuid;
VolumeManagerDatabaseHelper.UpdateExtentLocation(database, volume, dynamicRelocatedExtent);
}
public byte[] ReadSectors(long sectorIndex, int sectorCount)
{
List <ArrayPosition> readPositions = TranslateSectors(sectorIndex, sectorCount);
byte[] result = new byte[sectorCount * BytesPerSector];
int bytesRead = 0;
foreach (ArrayPosition readPosition in readPositions)
{
DynamicDiskExtent extent = m_extents[readPosition.DiskIndex];
byte[] extentBytes = extent.ReadSectors(readPosition.SectorIndex, readPosition.SectorCount);
Array.Copy(extentBytes, 0, result, bytesRead, extentBytes.Length);
bytesRead += extentBytes.Length;
}
return(result);
}
public override byte[] ReadSectors(long sectorIndex, int sectorCount)
{
return(m_extent.ReadSectors(sectorIndex, sectorCount));
}
