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32 lines
1.8 KiB
Markdown
32 lines
1.8 KiB
Markdown
---
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slug: /en/operations/system-tables/disks
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---
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# disks
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Contains information about disks defined in the [server configuration](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-multiple-volumes_configure).
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Columns:
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- `name` ([String](../../sql-reference/data-types/string.md)) — Name of a disk in the server configuration.
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- `path` ([String](../../sql-reference/data-types/string.md)) — Path to the mount point in the file system.
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- `free_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Free space on disk in bytes.
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- `total_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Disk volume in bytes.
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- `unreserved_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Free space which is not taken by reservations (`free_space` minus the size of reservations taken by merges, inserts, and other disk write operations currently running).
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- `keep_free_space` ([UInt64](../../sql-reference/data-types/int-uint.md)) — Amount of disk space that should stay free on disk in bytes. Defined in the `keep_free_space_bytes` parameter of disk configuration.
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**Example**
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```sql
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:) SELECT * FROM system.disks;
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```
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```text
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┌─name────┬─path─────────────────┬───free_space─┬──total_space─┬─keep_free_space─┐
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│ default │ /var/lib/clickhouse/ │ 276392587264 │ 490652508160 │ 0 │
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└─────────┴──────────────────────┴──────────────┴──────────────┴─────────────────┘
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1 rows in set. Elapsed: 0.001 sec.
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```
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[Original article](https://clickhouse.com/docs/en/operations/system-tables/disks) <!--hide-->
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