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Add a swap slice (partition) on a mirror

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Notes for creating swap for a NAS4Free box as a workaround to some form of crash/panic.

The swap space is on a plain set of disks. Not on a ZFS filesystem.

Partitions

Ensure the mirror is clean by deleting any old partion tables

# gpart destroy -F mirror/1TBRedMirror
mirror/1TBRedMirror destroyed

Create a new GUID partition table:

# gpart create -s GPT mirror/1TBRedMirror
mirror/1TBRedMirror created

Add a swap partition

# gpart add -t freebsd-swap -a 4k -s 64G mirror/1TBRedMirror
mirror/1TBRedMirrorp1 added

Use the rest of the disk for a UFS filesystem

# gpart add -t freebsd-ufs -a 4k mirror/1TBRedMirror
mirror/1TBRedMirrorp2 added

Verify what is there:

# gpart show mirror/1TBRedMirror
=>        34  1953525100  mirror/1TBRedMirror  GPT  (931G)
          34           6                       - free -  (3.0k)
          40   134217728                    1  freebsd-swap  (64G)
   134217768  1819307360                    2  freebsd-ufs  (867G)
  1953525128           6                       - free -  (3.0k)

Filesystem

 

Create a UFS filesystem on the second partition:

# newfs -U /dev/mirror/1TBRedMirrorp2
/dev/mirror/1TBRedMirrorp2: 888333.7MB (1819307360 sectors) block size 32768, fragment size 4096
        using 1419 cylinder groups of 626.09MB, 20035 blks, 80256 inodes.
        with soft updates
super-block backups (for fsck_ffs -b #) at:
 192, 1282432, 2564672, 3846912, 5129152, 6411392, 7693632, 8975872, .... lots more ...

Links

Appendicies

gpart partition types

 
From the manual:
     bios-boot		    The	system partition dedicated to second stage of
			    the	boot loader program.  Usually it is used by
			    the	GRUB 2 loader for GPT partitioning schemes.
			    The	scheme-specific	type is
			    "!21686148-6449-6E6F-744E-656564454649".

     efi		    The	system partition for computers that use	the
			    Extensible Firmware	Interface (EFI).  In such
			    cases, the GPT partitioning	scheme is used and the
			    actual partition type for the system partition can
			    also be specified as
			    "!c12a7328-f81f-11d2-ba4b-00a0c93ec93b".

     freebsd		    A FreeBSD partition	subdivided into	filesystems
			    with a BSD disklabel.  This	is a legacy partition
			    type and should not	be used	for the	APM or GPT
			    schemes.  The scheme-specific types	are "!165" for
			    MBR, "!FreeBSD" for	APM, and
			    "!516e7cb4-6ecf-11d6-8ff8-00022d09712b" for	GPT.

     freebsd-boot	    A FreeBSD partition	dedicated to bootstrap code.
			    The	scheme-specific	type is
			    "!83bd6b9d-7f41-11dc-be0b-001560b84f0f" for	GPT.

     freebsd-swap	    A FreeBSD partition	dedicated to swap space.  The
			    scheme-specific types are "!FreeBSD-swap" for APM,
			    "!516e7cb5-6ecf-11d6-8ff8-00022d09712b" for	GPT,
			    and	tag 0x0901 for VTOC8.

     freebsd-ufs	    A FreeBSD partition	that contains a	UFS or UFS2
			    filesystem.	 The scheme-specific types are
			    "!FreeBSD-UFS" for APM,
			    "!516e7cb6-6ecf-11d6-8ff8-00022d09712b" for	GPT,
			    and	tag 0x0902 for VTOC8.

     freebsd-vinum	    A FreeBSD partition	that contains a	Vinum volume.
			    The	scheme-specific	types are "!FreeBSD-Vinum" for
			    APM, "!516e7cb8-6ecf-11d6-8ff8-00022d09712b" for
			    GPT, and tag 0x0903	for VTOC8.

     freebsd-zfs	    A FreeBSD partition	that contains a	ZFS volume.
			    The	scheme-specific	types are "!FreeBSD-ZFS" for
			    APM, "!516e7cba-6ecf-11d6-8ff8-00022d09712b" for
			    GPT, and 0x0904 for	VTOC8.

 

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