ais storage command supports the following subcommands:

$ ais storage <TAB-TAB>
cleanup     disk        mountpath   summary     validate

Alternatively (or in addition), run with --help to view subcommands and short descriptions, both:

$ ais storage --help
   ais storage - monitor and manage clustered storage

   ais storage command [command options] [arguments...]

   show       show storage usage and utilization, disks and mountpaths
   summary    show bucket sizes and %% of used capacity on a per-bucket basis
   validate   check buckets for misplaced objects and objects that have insufficient numbers of copies or EC slices
   mountpath  show and attach/detach target mountpaths
   disk       show disk utilization and read/write statistics
   cleanup    perform storage cleanup: remove deleted objects and old/obsolete workfiles

   --help, -h  show help

As always, each subcommand (above) will have its own help and usage examples - the latter possibly spread across multiple markdowns.

You can easily look up examples and descriptions of any keyword via a simple find, for instance:

$ find . -type f -name "*.md" | xargs grep "ais.*mountpath"

Table of Contents

Storage cleanup

As all other supported batch operations (aka xactions), cleanup runs asynchronously and can be monitored during its run, e.g.:

# ais storage cleanup
Started storage cleanup "BlpmlObF8", use 'ais job show xaction BlpmlObF8' to monitor the progress

Further references:

Show capacity usage

For command line options and usage examples, please refer to:

Validate buckets

ais storage validate [BUCKET | PROVIDER]

Checks all objects of the bucket BUCKET and show the number of found issues: the number of misplaced objects, the number of objects that have insufficient number of copies etc. Non-zero number of misplaced objects may mean a bucket needs rebalancing.

If the optional argument is omitted, show information about all buckets.

Because the command checks every object, it may take a lot of time for big buckets. It is recommended to set bucket name or provider name to decrease execution time.


Validate only AIS buckets

$ ais storage validate  ais://
ais://bck1        2               0               0
ais://bck2        3               1               0

The bucket ais://bck2 has 3 objects and one of them is misplaced, i.e. it is inaccessible by a client. It results in ais ls ais://bck2 returns only 2 objects.

Mountpath (and disk) management

There are two related commands:

  • ais storage disk
  • ais storage mountpath

where mountpath is a higher-level abstraction that typically “utilizes” a single undivided disk. More exactly:

A mountpath is a single disk or a volume (a RAID) formatted with a local filesystem of choice, and a local directory that AIS utilizes to store user data and AIS metadata. A mountpath can be disabled and (re)enabled, automatically or administratively, at any point during runtime. In a given cluster, a total number of mountpaths would normally compute as a direct product of (number of storage targets) x (number of disks in each target).

You can manage and monitor (i.e., show) disks and mountpaths using ais storage command.

For strictly monitoring purposes, you can universally use ais show command, e.g.: ais show storage disk, etc.

Show disks

ais storage disk show [TARGET_ID]

or, same:

ais show storage disk [TARGET_ID]

Show mountpaths

As the name implies, the syntax:

ais show storage mountpath [TARGET_ID]

for example:

$ ais show storage mountpath t[TqPtghbiRw]

        Used Capacity (all disks): avg 15% max 18%
                                                /ais/mp1/2 /dev/nvme0n1(xfs)
                                                /ais/mp2/2 /dev/nvme1n1(xfs)
                                                /ais/mp3/2 /dev/nvme2n1(xfs)
                                                /ais/mp4/2 /dev/nvme3n1(xfs)

As always, --help will also list supported options. Note in particular the option to run continuously and periodically:

$ ais show storage mountpath --help
   ais show storage mountpath - show target mountpaths

   ais show storage mountpath [command options] [TARGET_ID]

   --refresh value  interval for continuous monitoring;
                    valid time units: ns, us (or µs), ms, s (default), m, h
   --count value    used together with '--refresh' to limit the number of generated reports (default: 0)
   --json, -j       json input/output
   --help, -h       show help

Show mountpaths for a given target or all targets.

Ease of Usage notice: like all other ais show commands, ais show storage mountpath is an alias (or a shortcut) - in this specific case - for ais storage mountpath show.

Examples (slightly outdated)

$ ais storage mountpath show 12356t8085

$ ais storage mountpath show
	No mountpaths

Attach mountpath

ais storage mountpath attach TARGET_ID=MOUNTPATH [DAEMONID=MOUNTPATH...]

Attach a mountpath on a specified target to AIS storage.


$ ais storage mountpath attach 12367t8080=/data/dir

Detach mountpath

ais storage mountpath detach TARGET_ID=MOUNTPATH [DAEMONID=MOUNTPATH...]

Detach a mountpath on a specified target from AIS storage.


$ ais storage mountpath detach 12367t8080=/data/dir