A disk's page

Click a disk in the window’s sidebar, in the Overview’s table or in the quick menu to open its page. The title is the disk’s name, with its server and LUN under it, such as storage.local · LUN 0.

The state, as a pill (Connected, Reconnecting…). Hover over it for what it means and since when.
The time range for the charts: 5 min, 1 h, 24 h or 7 d, while the disk is connected.
Show in Finder, which opens the disk’s volume.
Eject, or Attach for a disk that isn’t attached.
Options (…): Try Again (for a disk that isn’t connected), Remount, Reclaim Free Space (APFS disks), Test Speed…, Erase and Reformat…, Connect at Login, and Remove…, which needs the disk ejected first.
Settings and Add Disk.

When something needs you

If the disk’s state has something to say, a banner at the top says it, with since when (for a problem) and the one thing to do: Remount, Eject, Format…, Try Again, Take Over…, Attach Again, Use the New Space… or Attach. What a disk’s state means lists them all.

Now

A strip across the top shows what the disk is doing, with Live beside the title while the numbers update:

Figure	What it is
Throughput	Reads plus writes over the last second, with Read and Write beside it.
IOPS	Reads and writes per second, over the last second.
Latency p50	Half of the reads and writes in the last 5 seconds finished faster than this. Reads and writes are shown apart below it.
Latency p99	All but 1 in 100 of the reads and writes in the last 5 seconds finished faster than this.
Errors	Reads and writes that failed and were reported to apps, over the chart’s time range. Anything above 0 shows in red.
Flushes	Requests to the server to save what it has received so far, per second, with the average over the time range. Apps and macOS send them to make data safe.

History

The chart shows one figure at a time over the time range: Throughput, IOPS or Latency (with p50 or p99), reads and writes as two lines. Its legend shows the latest values; move the pointer over the chart to read any moment. Each point is a second at 5 min, and an average over 12 seconds, 5 minutes or 30 minutes at the longer ranges. History is kept for 7 days on this Mac.

Latency distribution shows how long the disk’s reads and writes took over the time range, as the share of them in each band from under 64 µs to a second or more: reads above the axis, writes below it, with the p50 and p99 marked. Its title counts the reads and writes it covers. A disk whose reads cluster far to the right is waiting on its server or network: see Get the most from your network.

Connection

Row	Shows
Server	The server it’s on. Click it for the server’s page.
Target	The target’s full name, with a button that copies it.
LUN	The disk’s number on the target.
Session	How long it has been logged in to the server, and how many times it has reconnected since BeamDisk connected it (Up 7 h 15 min · 1 reconnect). Disks on one target share its session: then the row names the others (Up 6 d 4 h · shared with Scratch).
Authentication	CHAP or None.
Digests	Whether CRC32C checksums are in use: CRC32C header + data, CRC32C header, CRC32C data or None.
New settings	Only when a setting waits for the disk’s next login to the server. Reconnect and Apply Now applies it now, and reconnects the disks that share its session too; if the server refuses it, the row says why, and the previous settings stay in use.
Last event	The last thing the server or the connection reported, when, and how long ago, such as The server reported a reset or restart.

Under them:

Connect at login: connect and attach this disk whenever BeamDisk opens; with Open at Login on, that’s when you log in.
Power-loss protection: Automatic, On or Off, with a note on what it’s doing and why. See Power-loss protection.

At the bottom, a line repeats how long writes are held if the server stops responding.

Disk

Row	Shows
Capacity	Its size, as Finder counts it.
Sector size	512 B or 4 KiB.
Contents	What’s on it: APFS, Empty, Formatting…, or another file system.
Access	Read-write; Read-only, or Read-only (4 KiB sectors) for a disk opened read-only for that reason; or Not shown for a disk macOS can’t read.
Mounted at	Where its volume is, while it’s mounted.