HP-UX mirror disks

[cheesytime]

Hello,

From SAM I see two unused disks, see below:

0.4.0 1 Unused 286102 COMPAQ BF3008AFEC

0.5.0 1 Unused 286102 COMPAQ BF3008AFEC


disk 7 0/4/1/0.4.0 sdisk CLAIMED DEVICE COMPAQ BF3008AFEC
/dev/dsk/c4t4d0 /dev/rdsk/c4t4d0

disk 8 0/4/1/0.5.0 sdisk CLAIMED DEVICE COMPAQ BF3008AFEC
/dev/dsk/c4t5d0 /dev/rdsk/c4t5d0

I would like to know how to make a RAID1 with thouse two disks and then create a filesystem with that RAID1 called /test (with the largefiles option on it)

Thanks a lot

[Pete Randall · Accepted solution]

Unless these two disks are part of some RAID unit that is capable of mirroring, you will need the MirrorDisk product, which is a purchaseable extension of LVM. You can check to see if you have it by running swlist:

# swlist |grep -i mirror
B2491BA B.11.11 MirrorDisk/UX

Assuming you have the MirrorDisk product, it works by mirroring logical volumes, not whole disks. Check the lvextend man page and you will see the information concerning the "-m mirror copies" option.


Pete

[Steven E. Protter]

Shalom,

Your server or disk unit may have hardware raid, negating the need to purchase Mirror/UX

SEP

[Mel Burslan]

provided you have mirrorUX software:

pvcreate /dev/rdsk/c4t4d0
pvcreate /dev/rdsk/c4t5d0

# eplace vg00 if you want to put them under a different vg below
vgextend vg00 /dev/dsk/c4t4d0
vgextend vg00 /dev/dsk/c4t5d0

lvcreate -s -n myNEWlvolNAME vg00
lvextend -L /dev/vg00/myNEWlvolNAME /dev/dsk/c4t4d0
lvextend -m 1 /dev/vg00/myNEWlvolNAME /dev/dsk/c4t5d0

newfs -F vxfs /dev/vg00/myNEWlvolNAME

One thing to consider: since this seems like a large disk drive (~290 GB) you may need to create a new volume group with larger PE-per-PV number or with larger PE sizes to accommodate these drives.

[Mel Burslan]

Too bad forums do not have an edit feature:

please correct the last command in my response as:

newfs -F vxfs -o largefiles /dev/vg00/myNEWlvolNAME

[unix adm]

If you have mirror disk software available


re-verify if these disks are not the part of any volume group already

strings /etc/lvmtab |grep -i c4t4d0
strings /etc/lvmtab |grep -i c4t5d0


Steps to create new vg and mirror using raid 1


pvcreate -f /dev/rdsk/c4t4d0
pvcreate -f /dev/rdsk/c4t5d0
mkdir /dev/vgtest
mknod group c64 0X020000

(minor number 0X020000 (make sure it is unused if used just use successive number 0X030000)

vgcreate vgtest /dev/dsk/c4t4d0
lvcreate -L M /dev/vgtest -n lvoltest
newfs -f vxfs -o largefiles /dev/vgtest/rlvoltest
mkdir /test
mount /dev/vgtest/lvoltest /test


vgextend /dev/vgtest /dev/dsk/c4t5d0

lvextend -m 1 /dev/vgtest/lvoltest /dev/dsk/c4t5d0

Once completes u can check using , look for mirror copy details.

lvdisplay /dev/vgtest/lvoltest



Thanks and Regards
Rajeev

[cheesytime]

Rajeev:

Amazing response!

>mknod group c64 0X030000

>(minor number 0X020000 (make sure it is >unused if used just use successive number >0X030000)

How do I find out wether its being used or not?

[cheesytime]

I tried:

root@host:/dev # ll /dev/*/group
cr--r--r-- 1 root sys 64 0x010000 May 9 2005 /dev/test/group
cr--r--r-- 1 root sys 64 0x020000 Sep 14 2005 /dev/test/group
crw-r----- 1 root sys 64 0x000000 Feb 26 2005 /dev/vg00/group

root@host:/dev # mknod group c64 0X030000
mknod: arg count
usage: mknod name b|c major minor
mknod name p

why mknod aint working?

[Patrick Wallek]

Assuming all of your VG names start with 'vg' do:

# ll /dev/vg*/group

or, to just search all of /dev:

# ll /dev/*/group

[Mel Burslan]

There needs to be a space between c and 64. That must be what the complaint is about

[Mel Burslan]

Also, please yake some time to assign points to the answers you have received here and in the past. You have not assigned any points to any of the answers given to your questions, until today. Here is the list of questions you asked:

https://forums11.itrc.hp.com/service/forums/pageList.do?userId=WW168242&listType=unassigned&forumId=1

[cheesytime]

sounds good, going step by step!

root@host:/dev/vg01 # vgcreate vg01 /dev/dsk/c4t4d0
Warning: Max_PE_per_PV for the volume group (65535) too small for this PV (71525).
Using only 65535 PEs from this physical volume.
Increased the number of physical extents per physical volume to 65535.
vgcreate: Volume group "/dev/vg01" could not be created:
VGRA for the disk is too big for the specified parameters. Increase the
extent size or decrease max_PVs/max_LVs and try again.

How do I fix that?

[cheesytime]

Mel:

I wasnt aware of that sumit points thing, i started submiting points with this thread in particular and will do so with the rest during the day.

Thanks.

[cheesytime]

Patric:

Thanks, mknod group c 64 0X030000 worked like charm, a space was needed between c and 64.

Now I get the following message when i run vgcreate

Warning: Max_PE_per_PV for the volume group (65535) too small for this PV (71525).
Using only 65535 PEs from this physical volume.
Increased the number of physical extents per physical volume to 65535.
vgcreate: Volume group "/dev/vg01" could not be created:
VGRA for the disk is too big for the specified parameters. Increase the
extent size or decrease max_PVs/max_LVs and try again.

Help me, im about to get tehre!

[unix adm]

vgcreate -l 255 -p 255 -e 5000 -s 64 /dev/vgtest /dev/dsk/c4t4d0


Its just that max PE per PV is limited to the 65535 value and with this big disk
you can just try increasing the PV size.


Good luck!

Rajeev

[unix adm]

srry I mean PE size instead of PV size, in the above command i have give PE size as 64 MB instead of default 4 mb.

Try the above command and it should work.


Thanks and Regards
Rajeev

[cheesytime]

Ra:

Worked like charm:

root@host:/dev/vg01 # vgcreate -l 255 -p 255 -e 5000 -s 64 /dev/vg01 /dev/dsk/c4t4d0
Volume group "/dev/vg01" has been successfully created.
Volume Group configuration for /dev/vg01 has been saved in /etc/lvmconf/vg01.conf

root@host:/dev/vg01 # lvcreate -L 10240M /dev/vg01 -n orau8

Usage: lvcreate
[-A Autobackup]
[-d Schedule]
[-i Stripes -I StripeSize]
{-l LogicalExtentsNumber |
-L LogicalVolumeSize}
[-m MirrorCopies]
[-n LogicalVolumeName]
[-p Permission]
[-r Relocate]
[-s Strict]
[-C Contiguous]
[-D Distributed]
[-M MirrorWriteCache]
[-c MirrorConsistency]
VolumeGroupName
"-n": Too many arguments


I get that error now

[Mel Burslan]

you need to specify the volume group as the last entry on the line. Your command needs to be like this :

lvcreate -L 10240M -n orau8 /dev/vg01

[Sharma Sanjeev]

Hi

Use

lvcreate -L 10240 -n orau8 /dev/vg01

than

Regards
Sanjeev

[cheesytime]

Mel:

amazing

root@host:/dev/vg01 # lvcreate -L 10240M -n orau8 /dev/vg01
Logical volume "/dev/vg01/orau8" has been successfully created with
character device "/dev/vg01/rorau8".
Logical volume "/dev/vg01/orau8" has been successfully extended.
Volume Group configuration for /dev/vg01 has been saved in /etc/lvmconf/vg01.conf

now in order to create a vxfs should I run

newfs -f vxfs -o largefiles /dev/vg01/orau8 ?

[Sharma Sanjeev]

Hi Again

You need to use

newfs -f vxfs -o largefiles /dev/vgtest/rlvoltest


rlvoltest not lvoltest

Regards
Sanjeev

[Sharma Sanjeev]

Hi Again

Sorry for last post it should be

newfs -F vxfs -o largefiles /dev/vg01/rlvoltest

Regards
Sanjeev

[Mel Burslan]

newfs requires the raw device file, so you will use

newfs -f vxfs -o largefiles /dev/vg01/rorau8

[Sharma Sanjeev]

You need to use ( upper case ) -F with newfs not -f

Regards
Sanjeev

[unix adm]

Hi Andrew,

I am sure you would have done with this by now, sorry about the small silly mistakes in the command syntax, allow me to type it all over again to make sure you have got correct procedure for this in one shot.

Considering following info

Volume Group Name - vgtest
Logical Volume name - lvoltest
Logical volume size - 20480 MB (20 GB)
Disk 1 - /dev/dsk/c4t4d0
Disk 2 - /dev/dsk/c4t5d0


Steps to create new vg
###################

#Verify if these disks are not the part of any volume group already


strings /etc/lvmtab |grep -i c4t4d0
strings /etc/lvmtab |grep -i c4t5d0

(above commands should come out without any output, if it is coming with the disk name means this disk is already being used for some other VG, in this case verify and use another disk which is free on the system)

pvcreate -f /dev/rdsk/c4t4d0
mkdir /dev/vgtest
mknod group c 64 0X020000
(minor number 0X020000 make sure it is unused, if used just use successive number 0X030000)

you can check it by running below command

ls -al /dev/*/group

crw------- 1 root sys 64 0x010000 May 28 17:39 /dev/vg01/group
crw-r----- 1 root sys 64 0x000000 Feb 26 11:06 /dev/vg00/group


vgcreate -l 255 -p 255 -e 5000 -s 64 /dev/vgtest /dev/dsk/c4t4d0
lvcreate -L 20480M -n lvoltest /dev/vgtest
newfs -F vxfs -o largefiles /dev/vgtest/rlvoltest
mkdir /test
mount /dev/vgtest/lvoltest /test

#take backup of /etc/fstab
cp /etc/fstab /etc/fstab_backup

# Appen below entry in fstab to be able to mount this file system after reboot.

/dev/vgtest/lvoltest /test vxfs delaylog,largefiles 0 2

run command confirm any syntax error in the entry you have added in /etc/fstab

#mountall

#vgcfgbackup vgtest
(To create/update LVM volume group configuration backup file, this you may need if there is any corruption of vginfo on any disk)

Mirroring (RAID 1)
####################

pvcreate -f /dev/rdsk/c4t5d0
vgextend /dev/vgtest /dev/dsk/c4t5d0
lvextend -m 1 /dev/vgtest/lvoltest /dev/dsk/c4t5d0
Once completes u can check using , look for mirror copy details.
lvdisplay /dev/vgtest/lvoltest

Thanks
Rajeev