{
    "content": [
        {
            "type": "text",
            "text": "# blkmapd (man)\n\n## NAME\n\nblkmapd - pNFS block layout mapping daemon\n\n## DESCRIPTION\n\nThe  blkmapd  daemon  performs device discovery and mapping for the parallel NFS (pNFS) block\nlayout client [RFC5663].\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS** (1 subsections)\n- **DESCRIPTION**\n- **OPTIONS** (3 subsections)\n- **CONFIGURATION FILE** (1 subsections)\n- **SEE ALSO**\n- **AUTHORS**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n"
        }
    ],
    "structuredContent": {
        "command": "blkmapd",
        "section": "",
        "mode": "man",
        "summary": "blkmapd - pNFS block layout mapping daemon",
        "synopsis": "",
        "tldr_summary": null,
        "tldr_examples": [],
        "tldr_source": null,
        "flags": [
            {
                "flag": "-h",
                "long": null,
                "arg": null,
                "description": ""
            },
            {
                "flag": "-d",
                "long": null,
                "arg": null,
                "description": ""
            },
            {
                "flag": "-f",
                "long": null,
                "arg": null,
                "description": ""
            }
        ],
        "examples": [],
        "see_also": [
            {
                "name": "nfs",
                "section": "5",
                "url": "https://www.chedong.com/phpMan.php/man/nfs/5/json"
            },
            {
                "name": "dmsetup",
                "section": "8",
                "url": "https://www.chedong.com/phpMan.php/man/dmsetup/8/json"
            },
            {
                "name": "nfs.conf",
                "section": "5",
                "url": "https://www.chedong.com/phpMan.php/man/nfs.conf/5/json"
            }
        ],
        "section_outline": [
            {
                "name": "NAME",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "SYNOPSIS",
                "lines": 1,
                "subsections": [
                    {
                        "name": "blkmapd [-h] [-d] [-f]",
                        "lines": 1
                    }
                ]
            },
            {
                "name": "DESCRIPTION",
                "lines": 13,
                "subsections": []
            },
            {
                "name": "OPTIONS",
                "lines": 1,
                "subsections": [
                    {
                        "name": "-h",
                        "lines": 1,
                        "flag": "-h"
                    },
                    {
                        "name": "-d",
                        "lines": 1,
                        "flag": "-d"
                    },
                    {
                        "name": "-f",
                        "lines": 1,
                        "flag": "-f"
                    }
                ]
            },
            {
                "name": "CONFIGURATION FILE",
                "lines": 3,
                "subsections": [
                    {
                        "name": "pipefs-directory",
                        "lines": 3
                    }
                ]
            },
            {
                "name": "SEE ALSO",
                "lines": 5,
                "subsections": []
            },
            {
                "name": "AUTHORS",
                "lines": 6,
                "subsections": []
            }
        ],
        "sections": {
            "NAME": {
                "content": "blkmapd - pNFS block layout mapping daemon\n",
                "subsections": []
            },
            "SYNOPSIS": {
                "content": "",
                "subsections": [
                    {
                        "name": "blkmapd [-h] [-d] [-f]",
                        "content": ""
                    }
                ]
            },
            "DESCRIPTION": {
                "content": "The  blkmapd  daemon  performs device discovery and mapping for the parallel NFS (pNFS) block\nlayout client [RFC5663].\n\nThe pNFS block layout protocol builds a complex storage hierarchy from a set of  simple  vol‐\numes.   These  simple  volumes  are  addressed by content, using a signature on the volume to\nuniquely name each one.  The daemon locates a volume by examining each block  device  in  the\nsystem for the given signature.\n\nThe  topology  typically  consists  of a hierarchy of volumes built by striping, slicing, and\nconcatenating the simple volumes.  The blkmapd daemon uses the device-mapper driver  to  con‐\nstruct logical devices that reflect the server topology, and passes these devices to the ker‐\nnel for use by the pNFS block layout client.\n",
                "subsections": []
            },
            "OPTIONS": {
                "content": "",
                "subsections": [
                    {
                        "name": "-h",
                        "content": "",
                        "flag": "-h"
                    },
                    {
                        "name": "-d",
                        "content": "",
                        "flag": "-d"
                    },
                    {
                        "name": "-f",
                        "content": "",
                        "flag": "-f"
                    }
                ]
            },
            "CONFIGURATION FILE": {
                "content": "The blkmapd daemon  recognizes  the  following  value  from  the  [general]  section  of  the\n/etc/nfs.conf configuration file:\n",
                "subsections": [
                    {
                        "name": "pipefs-directory",
                        "content": "Tells  blkmapd  where  to  look  for  the rpcpipefs filesystem.  The default value is\n/var/lib/nfs/rpcpipefs.\n"
                    }
                ]
            },
            "SEE ALSO": {
                "content": "nfs(5), dmsetup(8), nfs.conf(5)\n\nRFC 5661 for the NFS version 4.1 specification.\nRFC 5663 for the pNFS block layout specification.\n",
                "subsections": []
            },
            "AUTHORS": {
                "content": "Haiying Tang <TangHaiying@emc.com>\nJim Rees <rees@umich.edu>\n\n\n\n11 August 2011                                 blkmapd(8)",
                "subsections": []
            }
        }
    }
}