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@@ -139,7 +139,7 @@ For example, if you have 2,400 concurrent users, you'd need 2,400 handles on the
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If you're using [MSIX App attach or App attach](../../virtual-desktop/app-attach-overview.md) to dynamically attach applications, you can use Composite Image File System (CimFS) or VHD/VHDX files for [disk images](../../virtual-desktop/app-attach-overview.md#application-images). Either way, the scale limits are per VM mounting the image, not per user. The number of users is irrelevant when calculating scale limits. When a VM is booted, it mounts the disk image, even if there are zero users.
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If you're using App attach with CimFS, the disk images only consume handles on the disk image files. They don't consume handles on the root directory or the directory containing the disk image. However, because a CimFS image is a combination of the .cim file and at least two other files, for every VM mounting the disk image, you'll need one handle each for three files in the directory. So if you have 100 VMs, you'll need 300 file handles.
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If you're using App attach with CimFS, the disk images only consume handles on the disk image files. They don't consume handles on the root directory or the directory containing the disk image. However, because a CimFS image is a combination of the .cim file and at least two other files, for every VM mounting the disk image, you need one handle each for three files in the directory. So if you have 100 VMs, you need 300 file handles.
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You might run out of file handles if the number of VMs per app exceeds 2,000. In this case, use an additional Azure file share.
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In this scenario, you could hit the per file/directory limit with 2,000 mounts of a single VHD/VHDX. Or, if the share contains multiple VHD/VHDX files, you could hit the root directory limit first. For example, 100 VMs mounting 100 shared VHDX files will hit the 10,000 handle root directory limit.
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In another example, 100 VMs accessing 20 apps will require 2,000 root directory handles (100 x 20 = 2,000), which is well within the 10,000 limit for root directory handles. You'll also need a file handle and a directory/folder handle for every VM mounting the VHD(X) image, so 200 handles in this case (100 file handles + 100 directory handles), which is comfortably below the 2,000 handle limit per file/directory.
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In another example, 100 VMs accessing 20 apps require 2,000 root directory handles (100 x 20 = 2,000), which is well within the 10,000 limit for root directory handles. You'll also need a file handle and a directory/folder handle for every VM mounting the VHD(X) image, so 200 handles in this case (100 file handles + 100 directory handles), which is comfortably below the 2,000 handle limit per file/directory.
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If you're hitting the limits on maximum concurrent handles for the root directory or per file/directory, use an additional Azure file share.
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