CentOS - Jan 2010 - SAN help

My CentOS 5.4 box has a single HBA card with 2 ports connected to my
Storage. 2 Luns are assigned to my HBA card. Under /dev instead of seeing 4
devices I can see 12 devices from sdb to sdm. I am using qlogic driver that
is bulitin to the OS. Has any one seen this kind of situation?

Paras
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Greetings,

On Fri, Jan 8, 2010 at 10:08 AM, Paras pradhan <pradhanparas at gmail.com>
wrote:
> My CentOS 5.4 box has a single HBA card with 2 ports connected to my
> Storage. 2 Luns are assigned to my HBA card. Under /dev instead of seeing 4
> devices I can see 12 devices from sdb to sdm. I am using qlogic driver that
> is bulitin to the OS. Has any one seen this kind of situation?
>
> Paras

A case before multipathing is installed.

Install multipathing device driver from the server vendor's site.

One thing to remember: always prefer rpm as first and second choice.

Regards,

Rajagopal

On 1/8/10 6:38 AM, Paras pradhan wrote:
> My CentOS 5.4 box has a single HBA card with 2 ports connected to my
> Storage. 2 Luns are assigned to my HBA card. Under /dev instead of
> seeing 4 devices I can see 12 devices from sdb to sdm. I am using qlogic
> driver that is bulitin to the OS. Has any one seen this kind of situation?
Sounds like zoning problem ..

--
Eero

I did create the device mapper for multipathing but while testing
failover is not working. So my concern is with the hba driver since I
am seeing more than expected.


Thanks

Paras

On Thursday, January 7, 2010, Rajagopal Swaminathan
<raju.rajsand at gmail.com> wrote:
> Greetings,
>
> On Fri, Jan 8, 2010 at 11:01 AM, Paras pradhan <pradhanparas at
gmail.com> wrote:
>> Hi Rajagopal,
>>
>> Do you mean to say this is typical and is resolved after we use device
>> mapper multipathing?
>>
>
> IIRC, in about 2008.11 I was tasked build a cluster with SAN. The san
> administrator created 3 LUNs and first time around, it showed 12 LUNs.
> I think it was RHEL4. Afer installation of the multipathing software
> from server vendor site, we got the 3 LUNs properly. But at that time
> I did sweat a little.
>
> Of course assuming you have two qlogic, 2 san switches etc etc.
>
> In short, most likely yes.
>
> BTW I am not a storage administrator....
>
> Regards,
>
> Rajagopal
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
>

Greetings,

On Fri, Jan 8, 2010 at 11:31 AM, Paras pradhan <pradhanparas at gmail.com>
wrote:
> I did create the device mapper for multipathing but while testing
> failover is not working. So my concern is with the hba driver since I
> am seeing more than expected.
>
Check for the kernel modules for device mapper. I cant off hand tell
you which one of those are. also re check the zoning config.

Regards

Rajagopal

Hi

Not sure if you have done this already but install multipath as the os
sees multiple presented luns which needs to be tied up to one by
multipath also do not use the rh drivers for you qlogic it's not
recommended at all for any storage solutions.

Per

At Fredag, 08-01-2010 on 6:29 "Paras pradhan"  wrote:

Yes here is th o/p of fdisk -l. Two Luns are assigned. one of 323 G
and another of 359 G as seen blow. sda is my local disk.
So do you think incorrect zoning can lead to this?

Thanks
Paras.

-----------------------------------------------------
[root at prd1 ~]# fdisk -l

Disk /dev/sda: 146.1 GB, 146163105792 bytes
255 heads, 63 sectors/track, 17769 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sda1?? *?????????? 1????????? 33?????
265041?? 83? Linux
/dev/sda2????????????? 34??????? 4210???
33551752+? 82? Linux swap / Solaris
/dev/sda3??????????? 4211??????? 6821???
20972857+? 83? Linux
/dev/sda4??????????? 6822?????? 17769???
87939810??? 5? Extended
/dev/sda5??????????? 6822?????? 17769???
87939778+? 83? Linux

Disk /dev/sdb: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdb1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdb2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdc: 359.3 GB, 359399424000 bytes
255 heads, 63 sectors/track, 43694 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdc1?????????????? 1?????? 43694??
350972023+? 83? Linux

Disk /dev/sdd: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdd1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdd2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sde: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sde1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sde2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdf: 359.3 GB, 359399424000 bytes
255 heads, 63 sectors/track, 43694 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdf1?????????????? 1?????? 43694??
350972023+? 83? Linux

Disk /dev/sdg: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdg1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdg2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdh: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdh1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdh2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdi: 359.3 GB, 359399424000 bytes
255 heads, 63 sectors/track, 43694 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdi1?????????????? 1?????? 43694??
350972023+? 83? Linux

Disk /dev/sdj: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdj1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdj2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdk: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdk1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdk2?????????????? 3?????? 39325??
315861997+? 83? Linux

Disk /dev/sdl: 359.3 GB, 359399424000 bytes
255 heads, 63 sectors/track, 43694 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdl1?????????????? 1?????? 43694??
350972023+? 83? Linux

Disk /dev/sdm: 323.4 GB, 323459481600 bytes
255 heads, 63 sectors/track, 39325 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

?? Device Boot????? Start???????? End?????
Blocks?? Id? System
/dev/sdm1?????????????? 1??????????
2?????? 16033+? 83? Linux
/dev/sdm2?????????????? 3?????? 39325??
315861997+? 83? Linux

On Thu, Jan 7, 2010 at 11:26 PM, Eero Volotinen  wrote:

 On 1/8/10 7:21 AM, Paras pradhan wrote:
>
>
> On Thu, Jan 7, 2010 at 11:08 PM, Eero Volotinen  > wrote:
>
> ? ? On 1/8/10 6:38 AM, Paras pradhan wrote:
> ? ? ?> My CentOS 5.4 box has a single HBA card with 2 ports
connected to my
> ? ? ?> Storage. 2 Luns are assigned to my HBA card. Under /dev
instead of
> ? ? ?> seeing 4 devices I can see 12 devices from sdb to sdm. I
am using
> ? ? qlogic
> ? ? ?> driver that is bulitin to the OS. Has any one seen this
kind of
> ? ? situation?
>
> ? ? Sounds like zoning problem ..
>
>
> Storage is HDS and the LUN type created was of type netware. I don't
> know why this type but my storage administrator said its correct.
This
> might be an issue?
>
> Or if you can ellaborate how this is zoning problem it wud be great
help.

Are you sure that you can see correct luns? check the size ?

--
Eero
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> Hi
>
> Not sure if you have done this already but install multipath as the os
> sees multiple presented luns which needs to be tied up to one by
> multipath also do not use the rh drivers for you qlogic it's not
> recommended at all for any storage solutions.
>
> Per
Dear Per,

can you please elaborate why the QLogic kernel module shipping with CentOS
5 / RHEL 5 is not recommended? It for sure is documented to be used at
least in the NetApp host utilities guide, without any warning to prefer
the driver package provided on the QLogic site. And I do not see any
problem using it with CentOS / RHEL 5 device-mapper-multipath on a lot of
systems.

Regards

Alexander

Hi

For sure no problems, I see this about everyday, the major reason is
that the rh driver is not certified for use with Dell,HP or IBM for
that matter, if we get a support request where I work and the RH
driver is used for the qlogic card then?customer must install the
certified driver from the?vendor, this has a?lot to do with
compabillity with the bios etc, I am not saying that the RH driver is
bad it is just unsupported by most vendors.

Regards
Per?

At Fredag, 08-01-2010 on 11:06 "Alexander Dalloz"  wrote:
> Hi
>
> Not sure if you have done this already but install multipath as the
os
> sees multiple presented luns which needs to be tied up to one by
> multipath also do not use the rh drivers for you qlogic it's not
> recommended at all for any storage solutions.
>
> Per
Dear Per,

can you please elaborate why the QLogic kernel module shipping with
CentOS
5 / RHEL 5 is not recommended? It for sure is documented to be used at
least in the NetApp host utilities guide, without any warning to
prefer
the driver package provided on the QLogic site. And I do not see any
problem using it with CentOS / RHEL 5 device-mapper-multipath on a lot
of
systems.

Regards

Alexander

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