ADD iscsi Storage on w2025

kaismbarki Lv1Posted Mar-25-2026 00:36


The storage of this type is non-ATS and not recommended for use because it is not stable when there are too many SCSI reservations in some scenarios.

this is message when we try to add datastore from iscsci storage on windows 2025

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Your storage is non-ATS (Windows iSCSI limitation)
HCI warns because it uses old SCSI reservation
It will work, but not stable for production
Best solution → use ATS-supported storage or HCI local storage
Is this answer helpful?
Abdul Rahman Lv2Posted Mar-25-2026 11:45
  
Hi mate,
That message is not from Sangfor, but from your Windows Server 2025 when adding an iSCSI as a shared datastore

If your Windows Server is a VM in the Sangfor HCI environment, you can attach an iSCSI LUN directly to that VM, but it is not recommended and comes with important limitations from the HCI feature.

For example, when a VM migrates to another host, iSCSI will drop for a while, and your VM may miss data or experience corrupted data during active sessions due to performance IOPS failures.

My suggestion is just to map and attach your VM to aSAN as a local disk for best performance and Sangfor HCI feature
Muhammad Abid Lv2Posted Mar-25-2026 12:05
  
This message appears because the iSCSI storage you are trying to add does not support ATS (Atomic Test & Set) or proper SCSI-3 Persistent Reservations.

In environments where multiple hosts or cluster nodes access the same LUN/datastore, non-ATS storage can cause:

Storage instability
Datastore disconnects
VM or cluster performance issues
SCSI reservation conflicts

Recommended Actions

Check with the storage vendor for firmware updates or confirmation of ATS / SCSI-3 PR support.
If ATS is not supported, avoid using the same LUN on multiple hosts (use single-host access only as a temporary workaround).
For production or clustered environments, use enterprise storage that supports ATS / SCSI-3 Persistent Reservations.

Humayun Ahmed Lv3Posted Apr-08-2026 14:58
  
Your storage is non-ATS (Windows iSCSI limitation)
HCI warns because it uses old SCSI reservation
It will work, but not stable for production
Best solution → use ATS-supported storage or HCI local storage

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