Re install MSA30

[Fabian Crea]

I have a MSA30 with 5 disk of 146G each one, this is in first array

I have a MSA30 connected to a server RP3410, the storage has 5 disk of 146GB each one in the first 5 bays, the server has two controllers scsii connected to storage, all the discs seen by a single channel, the idea is to optimize the reading and to move two discs so that takes the other controller from storage, since I do this new reoganizacion, somebody can help me, please, thank you very much.

[Torsten.]

Hi,

which connector module is installed in the MSA30? 1, 2 or 4 connectors?

Are you using mirroring (LVM) or a smart array card?

Please post an "ioscan -fn" if possible.

[Fabian Crea]

Hi,

only 2 connectors,
I have LVM

The attach is ioscan.

thanks
FC

[Fabian Crea]

Sorry, I have 4 connectors. Only 2 used.
THZ

[Torsten.]

Looks like a rp3440 to me.

You have several options.
(Be aware that modifications will impact your LVM configuration).

First option is to connect the same bus in the MSA30 to the other SCSI HBA (slot 2) in your server.

In this case you have to modify the initiator ID before connecting the cable.

mptconfig -i 6 /dev/mpt6
mptconfig -i 6 /dev/mpt7

(for the "spare" card in slot 2)

Now you have redundant pathes to the disks and may add the "new" pathes to your volume group config.


The other option is to move 2 disks from the left to the right half of the chassis, cable the same way and mirror across the busses.
This will bring more performance, because 2 seperate busses are used.

[Guillermo Rossney]

Thanks Torsten!
It seeams as my partner and I tried to solve our problem in the same way!

I'll continue on this. Sorry by the double effort.

Our primary target is performance.

As i said on the other thread (thanks and sorry, again), our idea was move 2 disks to the other half of the chasis. But

- Our provider said that is not possible.
- We need to know the impact of that change on data already transferred to disks and actual LVM configuration.


Thanks a lot!

[Fabian Crea]

Thank very much for all, we will working in this case.

[Torsten.]

Please post the output of "vgdisplay -v", this will help to know about the impact on changing the disk locations.

(Please close the other thread)

[Fabian Crea]

Thanks
the output:

# vgdisplay -v
--- Volume groups ---
VG Name /dev/vg00
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 10
Open LV 10
Max PV 16
Cur PV 3
Act PV 3
Max PE per PV 4384
VGDA 6
PE Size (Mbytes) 32
Total PE 8748
Alloc PE 3096
Free PE 5652
Total PVG 0
Total Spare PVs 1
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/vg00/lvol1
LV Status available/syncd
LV Size (Mbytes) 320
Current LE 10
Allocated PE 20
Used PV 2

LV Name /dev/vg00/lvol2
LV Status available/syncd
LV Size (Mbytes) 4096
Current LE 128
Allocated PE 256
Used PV 2

LV Name /dev/vg00/lvol3
LV Status available/syncd
LV Size (Mbytes) 256
Current LE 8
Allocated PE 16
Used PV 2

LV Name /dev/vg00/lvol4
LV Status available/syncd
LV Size (Mbytes) 2048
Current LE 64
Allocated PE 128
Used PV 2

LV Name /dev/vg00/lvol5
LV Status available/syncd
LV Size (Mbytes) 2048
Current LE 64
Allocated PE 128
Used PV 2

LV Name /dev/vg00/lvol6
LV Status available/syncd
LV Size (Mbytes) 3424
Current LE 107
Allocated PE 214
Used PV 2

LV Name /dev/vg00/lvol7
LV Status available/syncd
LV Size (Mbytes) 2496
Current LE 78
Allocated PE 156
Used PV 2

LV Name /dev/vg00/lvol8
LV Status available/syncd
LV Size (Mbytes) 4608
Current LE 144
Allocated PE 288
Used PV 2

LV Name /dev/vg00/lvu11
LV Status available/syncd
LV Size (Mbytes) 30016
Current LE 938
Allocated PE 1876
Used PV 2

LV Name /dev/vg00/lvsql
LV Status available/syncd
LV Size (Mbytes) 224
Current LE 7
Allocated PE 14
Used PV 2


--- Physical volumes ---
PV Name /dev/dsk/c2t0d0
PV Status available
Total PE 4374
Free PE 2826
Autoswitch On

PV Name /dev/dsk/c2t1d0
PV Status available
Total PE 4374
Free PE 2826
Autoswitch On

PV Name /dev/dsk/c3t2d0
PV Status available/standby spare
Total PE 4374
Free PE 4374
Autoswitch On


VG Name /dev/vgprd
VG Write Access read/write
VG Status available
Max LV 255
Cur LV 7
Open LV 7
Max PV 16
Cur PV 5
Act PV 5
Max PE per PV 4375
VGDA 10
PE Size (Mbytes) 32
Total PE 21870
Alloc PE 20160
Free PE 1710
Total PVG 0
Total Spare PVs 0
Total Spare PVs in use 0

--- Logical volumes ---
LV Name /dev/vgprd/lvsql
LV Status available/syncd
LV Size (Mbytes) 1024
Current LE 32
Allocated PE 64
Used PV 2

LV Name /dev/vgprd/lvu12
LV Status available/syncd
LV Size (Mbytes) 133120
Current LE 4160
Allocated PE 8320
Used PV 2

LV Name /dev/vgprd/lvu13
LV Status available/syncd
LV Size (Mbytes) 92160
Current LE 2880
Allocated PE 5760
Used PV 3

LV Name /dev/vgprd/lvu14
LV Status available/syncd
LV Size (Mbytes) 15360
Current LE 480
Allocated PE 960
Used PV 2

LV Name /dev/vgprd/lvu151
LV Status available/syncd
LV Size (Mbytes) 2048
Current LE 64
Allocated PE 128
Used PV 2

LV Name /dev/vgprd/lvu152
LV Status available/syncd
LV Size (Mbytes) 2048
Current LE 64
Allocated PE 128
Used PV 2

LV Name /dev/vgprd/lvbkp
LV Status available/syncd
LV Size (Mbytes) 153600
Current LE 4800
Allocated PE 4800
Used PV 2


--- Physical volumes ---
PV Name /dev/dsk/c4t0d0
PV Status available
Total PE 4374
Free PE 0
Autoswitch On

PV Name /dev/dsk/c4t1d0
PV Status available
Total PE 4374
Free PE 0
Autoswitch On

PV Name /dev/dsk/c4t2d0
PV Status available
Total PE 4374
Free PE 610
Autoswitch On

PV Name /dev/dsk/c4t3d0
PV Status available
Total PE 4374
Free PE 150
Autoswitch On

PV Name /dev/dsk/c4t4d0
PV Status available
Total PE 4374
Free PE 950
Autoswitch On


#

[Torsten.]

OK, now we know all 5 external disks are used by the volume group /dev/vgprd.

Do you know how the disks are mirrored?

This is the plan:

- reconfigure 1 HBA(#2) to initiator ID 6
(using mptutil)

- connect each bus with 2 cables to your host (better to shut the host down for this)
e.g.
HBA1 connector1 -> A1 : A2 HBA2 connector1
HBA1 connector2 -> B1 : B1 HBA2 connector2

- now you have 2 device files for each disk

- split the LVM mirror

- remove the device files for the disks to be re-located

- re-locate the disks to the other bus

- create device files

- include the disks to the VG

-include the alternate pathes to the VG

- mirror the lvols


After this, the "vgdisplay -v" would look very similar to this:

--- Physical volumes ---
PV Name /dev/dsk/c2t0d7s2
PV Name /dev/dsk/c4t0d7s2 Alternate Link
PV Status available
Total PE 44940
Free PE 4
Autoswitch On

PV Name /dev/dsk/c8t0d7s2
PV Name /dev/dsk/c6t0d7s2 Alternate Link

PV Status available
Total PE 44940
Free PE 4
Autoswitch On