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To create a new cache or writecache LV with a single command:
lvcreate --type cache|writecache
-n Name -L Size --cachedevice PVfast VG [PVslow ...]
- A new main linear|striped LV is created as usual, using the
specified -n Name and -L Size, and using the optionally
specified PVslow devices.
- Then, a new cachevol LV is created internally, using PVfast
specified by the cachedevice option.
- Then, the cachevol is attached to the main LV, converting the
main LV to type cache|writecache.
Include --cachesize Size to specify the size of cache|writecache
to create from the specified --cachedevice PVs, otherwise the
entire cachedevice PV is used. The --cachedevice option can be
repeated to create the cache from multiple devices, or the
cachedevice option can contain a tag name specifying a set of PVs
to allocate the cache from.
To create a new cache or writecache LV with a single command
using an existing cachevol LV:
lvcreate --type cache|writecache
-n Name -L Size --cachevol LVfast VG [PVslow ...]
- A new main linear|striped LV is created as usual, using the
specified -n Name and -L Size, and using the optionally
specified PVslow devices.
- Then, the cachevol LVfast is attached to the main LV, converting
the main LV to type cache|writecache.
In cases where more advanced types (for the main LV or cachevol LV)
are needed, they should be created independently and then combined
with lvconvert.
Example
-------
user creates a new VG with one slow device and one fast device:
$ vgcreate vg /dev/slow1 /dev/fast1
user creates a new 8G main LV on /dev/slow1 that uses all of
/dev/fast1 as a writecache:
$ lvcreate --type writecache --cachedevice /dev/fast1
-n main -L 8G vg /dev/slow1
Example
-------
user creates a new VG with two slow devs and two fast devs:
$ vgcreate vg /dev/slow1 /dev/slow2 /dev/fast1 /dev/fast2
user creates a new 8G main LV on /dev/slow1 and /dev/slow2
that uses all of /dev/fast1 and /dev/fast2 as a writecache:
$ lvcreate --type writecache --cachedevice /dev/fast1 --cachedevice /dev/fast2
-n main -L 8G vg /dev/slow1 /dev/slow2
Example
-------
A user has several slow devices and several fast devices in their VG,
the slow devs have tag @slow, the fast devs have tag @fast.
user creates a new 8G main LV on the slow devs with a
2G writecache on the fast devs:
$ lvcreate --type writecache -n main -L 8G
--cachedevice @fast --cachesize 2G vg @slow
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| .. | ||
| .exported_symbols | ||
| .gitignore | ||
| args.h | ||
| cmdnames.h | ||
| command-lines.in | ||
| command.c | ||
| command.h | ||
| commands.h | ||
| dumpconfig.c | ||
| errors.h | ||
| formats.c | ||
| license.inc | ||
| lv_props.h | ||
| lv_types.h | ||
| lvchange.c | ||
| lvconvert_poll.c | ||
| lvconvert_poll.h | ||
| lvconvert.c | ||
| lvcreate.c | ||
| lvdisplay.c | ||
| lvextend.c | ||
| lvm2cmd-static.c | ||
| lvm2cmd.c | ||
| lvm2cmd.h | ||
| lvm2cmdline.h | ||
| lvm-static.c | ||
| lvm.c | ||
| lvmcmdlib.c | ||
| lvmcmdline.c | ||
| lvmdiskscan.c | ||
| lvpoll.c | ||
| lvreduce.c | ||
| lvremove.c | ||
| lvrename.c | ||
| lvresize.c | ||
| lvscan.c | ||
| Makefile.in | ||
| polldaemon.c | ||
| pvchange.c | ||
| pvck.c | ||
| pvcreate.c | ||
| pvdisplay.c | ||
| pvmove_poll.c | ||
| pvmove_poll.h | ||
| pvmove.c | ||
| pvremove.c | ||
| pvresize.c | ||
| pvscan.c | ||
| reporter.c | ||
| segtypes.c | ||
| stub.h | ||
| tags.c | ||
| tool.h | ||
| toollib.c | ||
| toollib.h | ||
| tools.h | ||
| vals.h | ||
| vgcfgbackup.c | ||
| vgcfgrestore.c | ||
| vgchange.c | ||
| vgck.c | ||
| vgcreate.c | ||
| vgdisplay.c | ||
| vgexport.c | ||
| vgextend.c | ||
| vgimport.c | ||
| vgimportclone.c | ||
| vgmerge.c | ||
| vgmknodes.c | ||
| vgreduce.c | ||
| vgremove.c | ||
| vgrename.c | ||
| vgscan.c | ||
| vgsplit.c | ||