// Need to find 3 values, Total drive size, Root drive used, actual used by path
// Need to be aware of UNC paths
// Need to be aware of Junctions
private static void FindAndAddDisplaySizes(string path, ref UInt64 min, ref UInt64 max)
{
ulong freeBytesAvailable;
ulong pathUsedBytes;
ulong rootBytesNotCoveredByPath;
DriveSpaceDisplay.FreeBytesAvailable(out freeBytesAvailable, path, out pathUsedBytes, out rootBytesNotCoveredByPath);
min += pathUsedBytes;
max += pathUsedBytes;
max += freeBytesAvailable;
}
private void btnFileCount_Click(object sender, EventArgs e)
{
if (string.IsNullOrWhiteSpace(txtCoverageMin.Text))
{
btnCoverage_Click(sender, e);
}
try
{
Enabled = false;
using (new WaitCursor(true))
{
ulong freeBytesAvailable;
ulong pathUsedBytes;
ulong rootBytesNotCoveredByPath;
// e.g. 100,000 files @ 256KB/2 block size = 12GB of "extra" space
// So this is alot more tricky.
// 1st get the Minimum space that could be used for the Parity (Ignore the existing parity)
// For each parity target find min space after ignoring "existing" parity file
ulong maxParitySizeAvailable = ulong.MaxValue;
foreach (string raidTarget in RaidTargets)
{
DriveSpaceDisplay.FreeBytesAvailable(out freeBytesAvailable, raidTarget, out pathUsedBytes, out rootBytesNotCoveredByPath);
ulong currentTarget = freeBytesAvailable + pathUsedBytes;
if (maxParitySizeAvailable > currentTarget)
{
maxParitySizeAvailable = currentTarget;
}
}
// 2 - Then for each of the sources, get the number of actual files
// Set Min value to the actual max of the files
// 3 - Then for each source find actual and available coverage
// use the actual files, and project to theoretical possible
// Set Max value to the max of those
ulong minFiles = 0;
// 4 - Find the Max covered,
ulong maxFiles = 1 << 18;
// 5 - Make sure that Parity has enough room times the number of max files,
// and add onto the left over space to find the min and max values.
ulong maxProjectedSource = 0;
foreach (string path in SnapShotSources)
{
DriveSpaceDisplay.FreeBytesAvailable(out freeBytesAvailable, path, out pathUsedBytes, out rootBytesNotCoveredByPath);
ulong currentSource = freeBytesAvailable + pathUsedBytes;
if (maxProjectedSource < currentSource)
{
maxProjectedSource = currentSource;
}
}
ulong minParityNeeded = maxProjectedSource + (minFiles * ulong.Parse(txtCoverageMin.Text)) / 2;
ulong maxParityNeeded = maxProjectedSource + (minFiles * ulong.Parse(txtCoverageMax.Text)) / 2;
if (maxParityNeeded > maxParitySizeAvailable)
{
lblBadNews.Text = "Display badnews about theoretical projected value - maxParityNeeded > maxParitySizeAvailable";
}
if (minParityNeeded > maxParitySizeAvailable)
{
// Display badnews about theoretical projected value;
lblBadNews.Text = "Display badnews about theoretical projected value - minParityNeeded > maxParitySizeAvailable";
}
}
}
finally
{
Enabled = true;
}
}
