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Compatibility

Mac Apple Silicon (M1 or later)
macOS macOS 27 or later
Network Wired Ethernet recommended. Tested on 10 GbE, at MTU 1500 and 9000.
Storage An iSCSI target: see What a target needs
Target Status
TrueNAS Tested: SSD pools and hard-drive pools (RAIDZ1); 512-byte extents (recommended) and 4 KiB; with and without CHAP, one-way and mutual; MTU 1500 and 9000. Setup guide
Linux LIO / targetcli Tested: Debian 13; persistent reservations, including ones kept across a target restart; MTU 9000. The benchmarks ran on it.
Others Not tested yet. BeamDisk uses standard iSCSI; tell us how yours does
Discovery SendTargets, by the server’s address
Authentication None, CHAP, mutual CHAP (MD5)
Integrity CRC32C header and data digests (optional)
Exclusive access SCSI persistent reservations (SPC-3)
Outages Writes held for 15 to 300 seconds (60 by default), with automatic reconnects
File systems APFS and Mac OS Extended (Journaled): read and write. exFAT, FAT and NTFS: read-only. Details
Free space Given back to thin-provisioned targets (SCSI UNMAP), on APFS disks
Time Machine Supported, after a one-time profile. Set it up

Intel Macs, multipath (MPIO), one disk on two Macs at once, managed configuration through MDM profiles, encryption of iSCSI traffic, and disks that connect before a user logs in.