Veritas Volume Manager FAQ 1

Note that the first 28 questions have answers related to using the command line. Sun do not normally support this method of bottom up creation of volumes. An explanation of why can be seen in Q97. The questions are designed to give you an idea of what goes on in the background. However, if at all possible, use the GUI.

----

1. How do I create a disk group ?

2. How do I create a a subdisk ?

3. How do I split a subdisk into 2 or more subdisks ?

4. How do I create a concat plex from two subdisks ?

5. How do I create a volume from a plex ?

6. What this volume looks like from a vxprint -Ath output

7. How do I start this volume ?

8. What this volume looks like from a vxprint -Ath output

9. How do I make this a mirrored volume ?

10. What this volume looks like from a vxprint -Ath output during mirror sync ?

11. What this volume looks like from a vxprint -Ath output after mirror ?

12. How do I blow away a mirrored volume ?

13. How do I blow away the subdisks ?

14. How do I attaching a plex to another plex in a volume ?

15. What this volume looks like from a vxprint -Ath output during attach ?

16. What does this volume look like from a vxprint -Ath output after attach ?

17. How do I detach a plex from a volume ?

18. What does this volume look like from a vxprint -Ath output after attach ?

19. How do I disassociate a plex from a volume ?

20. How do I add a disk into my disk group ?

21. How do I create a RAID5 volume ?

22. How does the vxprint -Ath for a RAID 5 volume look during the build ?

23. How does the vxprint -Ath for a RAID 5 volume look after the build ?

24. How do I get information about a RAID5 volume ?

25. How do I build a hot-spare ?

26. How does a hot spare look in vxprint -Ath

27. How do I make this volume a filesystem and mount it ?

28. How does a RAID 5 volume look if we loose a sub-disk ?

----1. How do I create a disk group ?

/usr/sbin/vxdg init disk01=c2t0d0s2

2. How do I create a a subdisk ?

/usr/sbin/vxmake -g sd disk01-01 dm_name=disk01 dm_offset=0 len=4152640

3. How do I split a subdisk into 2 or more subdisks ?

/usr/sbin/vxsd -g -s 152640 split disk02-01 disk02-02

4. How do I create a concat plex from two subdisks ?

/usr/sbin/vxmake -g plex pl-01 sd=disk01-01,disk02-01

5. How do I create a volume from a plex ?

/usr/sbin/vxmake -U fsgen -g vol vol01 read_pol=SELECT user=root group=other mode=0644 log_type=NONE len=4305279 plex=pl-01

6. What this volume looks like from a vxprint -Ath output

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	DISABLED	CLEAN	4305279	SELECT	-
pl	pl-01	vol01	DISABLED	CLEAN	4305279	CONCAT	-	RW
sd	disk01-01	pl-01	disk01	0	4152639	0	c1t5d0	ENA
sd	disk02-01	pl-01	disk02	0	152640	4152639	c1t3d0	ENA

7. How do I start this volume ?

/usr/sbin/vxvol -g -f start vol01

8. What this volume looks like from a vxprint -Ath output

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	4305279	SELECT	-
pl	pl-01	vol01	ENABLED	ACTIVE	4305279	CONCAT	-	RW
sd	disk01-01	pl-01	disk01	0	4152639	0	c1t5d0	ENA
sd	disk02-01	pl-01	disk02	0	152640	4152639	c1t3d0	ENA

9. How do I make this a mirrored volume ?

/usr/sbin/vxassist -g mirror vol01 layout=nostripe

10. What this volume looks like from a vxprint -Ath output during mirror sync ?

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	4305279	SELECT	-
pl	vol01-01	vol01	ENABLED	TEMPRMSD	4306160	CONCAT	-	WO
sd	disk04-01	vol01-01	disk04	0	153520	0	c1t1d0	ENA
sd	disk03-01	vol01-01	disk03	0	4152640	153520	c1t4d0	ENA
pl	pl-01	vol01	ENABLED	ACTIVE	4305279	CONCAT	-	RW
sd	disk01-01	pl-01	disk01	0	4152639	0	c1t5d0	ENA
sd	disk02-01	pl-01	disk02	0	152640	4152639	c1t3d0	ENA

11. What this volume looks like from a vxprint -Ath output after mirror ?

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	4305279	SELECT	-
pl	vol01-01	vol01	ENABLED	ACTIVE	4306160	CONCAT	-	RW
sd	disk04-01	vol01-01	disk04	0	153520	0	c1t1d0	ENA
sd	disk03-01	vol01-01	disk03	0	4152640	153520	c1t4d0	ENA
pl	pl-01	vol01	ENABLED	ACTIVE	4305279	CONCAT	-	RW
sd	disk01-01	pl-01	disk01	0	4152639	0	c1t5d0	ENA
sd	disk02-01	pl-01	disk02	0	152640	4152639	c1t3d0	ENA

12. How do I blow away a mirrored volume ?

/usr/sbin/vxedit -g -fr rm vol01

13. How do I blow away the subdisks ?

/usr/sbin/vxedit -g rm disk02-02 disk01-02

14. How do I attaching a plex to another plex in a volume ?

/usr/sbin/vxplex -g att vol01 Cor-Plex-2

15. What this volume looks like from a vxprint -Ath output during attach ?

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	2000000	SELECT	-
pl	Cor-Plex	vol01	ENABLED	ACTIVE	2000000	CONCAT	-	RW
sd	disk-01	Cor-Plex	disk01	0	1000000	0	c1t5d0	ENA
sd	disk-02	Cor-Plex	disk02	0	1000000	1000000	c1t3d0	ENA
pl	Cor-Plex-2	vol01	ENABLED	TEMP	2000000	CONCAT	-	WO
sd	disk-01-2	Cor-Plex-2	disk01	1000000	1000000	0	c1t5d0	ENA
sd	disk-02-2	Cor-Plex-2	disk02	1000000	1000000	1000000	c1t3d0	ENA

16. What does this volume look like from a vxprint -Ath output after attach ?

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	2000000	SELECT	-
pl	Cor-Plex	vol01	ENABLED	ACTIVE	2000000	CONCAT	-	RW
sd	disk-01	Cor-Plex	disk01	0	1000000	0	c1t5d0	ENA
sd	disk-02	Cor-Plex	disk02	0	1000000	1000000	c1t3d0	ENA
pl	Cor-Plex-2	vol01	ENABLED	ACTIVE	2000000	CONCAT	-	RW
sd	disk-01-2	Cor-Plex-2	disk01	1000000	1000000	0	c1t5d0	ENA
sd	disk-02-2	Cor-Plex-2	disk02	1000000	1000000	1000000	c1t3d0	ENA

17. How do I detach a plex from a volume ?

usr/sbin/vxplex -g det Cor-Plex-2

18. What does this volume look like from a vxprint -Ath output after attach ?

V	NAME	USETYPE	KSTATE	STATE	LENGTH	READPOL	PREFPLEX
PL	NAME	VOLUME	KSTATE	STATE	LENGTH	LAYOUT	NCOL/WID	MODE
SD	NAME	PLEX	DISK	DISKOFFS	LENGTH	[COL/]OFF	DEVICE	MODE
v	vol01	fsgen	ENABLED	ACTIVE	2000000	SELECT	-
pl	Cor-Plex	vol01	ENABLED	ACTIVE	2000000	CONCAT	-	RW
sd	disk-01	Cor-Plex	disk01	0	1000000	0	c1t5d0	ENA
sd	disk-02	Cor-Plex	disk02	0	1000000	1000000	c1t3d0	ENA
pl	Cor-Plex-2	vol01	DETACHED	STALE	2000000	CONCAT	-	RW
sd	disk-01-2	Cor-Plex-2	disk01	1000000	1000000	0	c1t5d0	ENA
sd	disk-02-2	Cor-Plex-2	disk02	1000000	1000000	1000000	c1t3d0	ENA

19. How do I disassociate a plex from a volume ?

usr/sbin/vxplex -g dis Cor-Plex-2| pl | Cor-Plex-2 | - | DISABLED | - | 2000000 | CONCAT | - | RW |

sd	disk-01-2	Cor-Plex-2	disk01	1000000	1000000	0	c1t5d0	ENA
sd	disk-02-2	Cor-Plex-2	disk02	1000000	1000000	1000000	c1t3d0	ENA

20. How do I add a disk into my disk group ?

/usr/sbin/vxdg -g adddisk disk05=c1t5d2s2

21. How do I create a RAID5 volume ?

/usr/sbin/vxassist -g -p maxsize layout=raid5,log nstripe=3 stripeunit=32 disk01 disk02 disk03 disk04

This returns the maximum size (8304640) of the volume which can be used in the following command.

/usr/sbin/vxassist -g make vol01 8304640 layout=raid5,log nstripe=3 stripeunit=32 disk01 disk02 disk03 disk04

22. How does the vxprint -Ath for a RAID 5 volume look during the build ?

v	vol-r5	raid5	DETACHED	EMPTY	12456192	RAID	-
pl	vol-r5-01	vol-r5	ENABLED	EMPTY	12457728	RAID	4/128	RW
sd	disk04-01	vol-r5-01	disk04	0	4152640	0/0	c1t1d0	ENA
sd	disk02-01	vol-r5-01	disk02	0	4152640	1/0	c1t3d0	ENA
sd	disk03-01	vol-r5-01	disk03	0	4152640	2/0	c1t4d0	ENA
sd	disk01-01	vol-r5-01	disk01	0	4152640	3/0	c1t5d0	ENA
pl	vol-r5-02	vol-r5	ENABLED	EMPTY	5600	CONCAT	-	RW
sd	disk05-01	vol-r5-02	disk05	0	5600	0	c1t2d2	ENA

23. How does the vxprint -Ath for a RAID 5 volume look after the build ?

v	vol-r5	raid5	ENABLED	ACTIVE	12456192	RAID	-
pl	vol-r5-01	vol-r5	ENABLED	ACTIVE	12457728	RAID	4/128	RW
sd	disk04-01	vol-r5-01	disk04	0	4152640	0/0	c1t1d0	ENA
sd	disk02-01	vol-r5-01	disk02	0	4152640	1/0	c1t3d0	ENA
sd	disk03-01	vol-r5-01	disk03	0	4152640	2/0	c1t4d0	ENA
sd	disk01-01	vol-r5-01	disk01	0	4152640	3/0	c1t5d0	ENA
pl	vol-r5-02	vol-r5	ENABLED	LOG	5600	CONCAT	-	RW
sd	disk05-01	vol-r5-02	disk05	0	5600	0	c1t2d2	ENA

24. How do I get information about a RAID5 volume ?

/usr/sbin/vxinfo -U raid5 -g vol-r5

25. How do I build a hot-spare ?

/usr/sbin/vxedit -g set spare=on subdisk

26. How does a hot spare look in vxprint -Ath

DM NAME DEVICE TYPE PRIVLEN PUBLEN STATE

dm disk06 c1t5d1s2 sliced 66079 978880 SPARE

27. How do I make this volume a filesystem and mount it ?

/usr/sbin/mkfs /dev/vx/rdsk//vol-01 12456192

/usr/sbin/mount /dev/vx/dsk//vol-01 /mnt

28. How does a RAID 5 volume look if we loose a sub-disk ?

v	vol-r5	raid5	ENABLED	ACTIVE	12456192	RAID	-
pl	vol-r5-01	vol-r5	ENABLED	ACTIVE	12457728	RAID	4/128	RW
sd	disk04-01	vol-r5-01	disk04	0	4152640	0/0	c1t1d0	ENA
sd	disk02-01	vol-r5-01	disk02	0	4152640	1/0	-	NDEV
sd	disk03-01	vol-r5-01	disk03	0	4152640	2/0	c1t4d0	ENA
sd	disk01-01	vol-r5-01	disk01	0	4152640	3/0	c1t5d0	ENA
pl	vol-r5-02	vol-r5	ENABLED	LOG	5600	CONCAT	-	RW
sd	disk05-01	vol-r5-02	disk05	0	5600	0	c1t2d2	ENA