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How HORCM_LDEVG work

Question asked by Javier Arjona on Oct 2, 2014
Latest reply on May 15, 2015 by Dang Luong

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Hi,

I trying to understand how HORCM_LDEVG work and CCI manual doesn't has a clear example. These are my configuration definition files:

-----------

HORCM_MON

#ip_address service poll(10ms) timeout(10ms)

pacorald1 horcm8 12000 3000

HORCM_CMD

#dev_name #dev_name

/dev/rdsk/c2d88s2 # VSP CCF

HORCM_LDEV

#dev_group dev_name port# TargetID LU# MU#

SI_BARU_NOGAL baru_nogala 65238 03:20 1

SI_BARU_NOGAL baru_nogalb 65238 03:21 1

SI_BARU_NOGAL baru_nogalc 65238 03:23 1

SI_BARU_ROBLE baru_roblea 65238 03:20 0

SI_BARU_ROBLE baru_robleb 65238 03:21 0

SI_BARU_ROBLE baru_roblec 65238 03:23 0

HORCM_LDEVG

#Copy_Group ldev_group Serial#

SI_BARU_NOGAL SIGRP1 65238

HORCM_INST

#dev_group ip_address service

SI_BARU_NOGAL pacorald1 horcm9

SI_BARU_ROBLE pacorald1 horcm9

SIGRP1 pacorald1 horcm9

-----------

HORCM_MON

#ip_address service poll(10ms) timeout(10ms)

pacorald1 horcm9 12000 3000

HORCM_CMD

#dev_name #dev_name

/dev/rdsk/c2d88s2 # VSP CCF

HORCM_LDEV

#dev_group dev_name port# TargetID LU# MU#

SI_BARU_NOGAL baru_nogala 65238 03:36 0

SI_BARU_NOGAL baru_nogalb 65238 03:37 0

SI_BARU_NOGAL baru_nogalc 65238 03:38 0

SI_BARU_ROBLE baru_roblea 65238 03:5B 0

SI_BARU_ROBLE baru_robleb 65238 03:5C 0

SI_BARU_ROBLE baru_roblec 65238 03:5D 0

HORCM_LDEVG

#Copy_Group ldev_group Serial#

SI_BARU_NOGAL SIGRP1 65238

HORCM_INST

#dev_group ip_address service

SI_BARU_NOGAL pacorald1 horcm8

SI_BARU_ROBLE pacorald1 horcm8

SIGRP1 pacorald1 horcm8

-----------

When I try to start instance 8 I got the following message:

# /HORCM/usr/bin/horcmstart.sh 8

starting HORCM inst 8

HORCM inst 8 has failed to start.

# tail -20 /HORCM/log8/curlog/horcm_pacorald1.log

09:51:17-6f935-25503- [HORCREAD]: maxldev = 65280, unitnum = 256

09:51:17-6fba8-25503- [HORCREAD]: maxhorc = 4, maxmrcf = 64, maxlun = 2048, maxctg = 256, maxjnlg = 256, mixport =1, slprflag = 0

09:51:17-6fe11-25503- [HORCREAD]: Number of used instance(s) = 47, Number of attached instance(s) = 2, Number of same instance(s) = 1

09:51:17-70576-25503- [HORCREAD] execute-test read is done.:/dev/rdsk/c2d88s2

09:51:17-707ec-25503- [setldevgrpdata] get ldevgroup(SIGRP1) from DKC(Ser#:65238).

09:51:17-71da1-25503- setldevgrpdata: ERROR: ldevgrpname(SIGRP1) is not found in DKC(Ser#:65238)

09:51:17-7214f-25503- ERROR:horcm_cfg_create

09:51:17-7260d-25503- [HORCRELOWNLBA] floatable LBA(e031) is released.ID:0:/dev/rdsk/c2d88s2

09:51:22-26366-25502- horcmgr:Failed to connect to HORCM.

Can anybody helpme with this error?

Dang Luong

Oct 2, 2014 5:55 PM

Correct Answer

You're on the right track. The overall process would be:

Use raidcom to create a device group
Example: raidcom add device_grp -device_grp_name copy1 dev1 -ldev_id 04:00
raidcom add device_grp -device_grp_name copy1 dev2 -ldev_id 04:01
Use raidcom to create a copy group containing the device group created above
Example: raidcom add copy_grp -copy_grp_name oracle_primary copy1
Modify HORCM to contain:
HORCM_LDEVG
oracle_primary copy1 65238
Create the pair
paircreate -g oracle_primary...

Hope this helps.

Regards,

Dang Luong

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Dang Luong

Oct 2, 2014 9:32 AM

Hi Javier,

HORCM_LDEVG is a group of volumes. You can create agroup and define volumes that belong in the group using raidcom (part of CCI). The definitions are saved on the array. This is different from the groups defined in HORCM_LDEV in that those reside in HORCM files on CCI servers.

Your error sounds like that HORCM_LDEVG hasn't been created on the array. The manual CCI User Reference has a section on defining copy groups that is pretty good. It's called "Define device group".

Regards,

Dang Luong

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Javier Arjona @ Dang Luong on Oct 2, 2014 12:21 PM

Tkanks Dang,

I'm not shure what can I do with HORCM_LDEVG, but I will try to explain that. Let's see the folloing example:

horcm0.conf definition:

HORCM_LDEV

copy1 dev1 65238 04:00 0

copy1 dev2 65238 04:01 0

copy2 dev3 65238 10:00 0

copy2 dev3 65238 10:01 0

HORCM_INST

copy1 localhost horcm1

copy2 localhost horcm1

horcm1.conf definition:

HORCM_LDEV

copy1 dev1 65238 05:10 0

copy1 dev2 65238 05:11 0

copy2 dev3 65238 11:10 0

copy2 dev4 65238 11:11 0

HORCM_INST

copy1 localhost horcm0

copy2 localhost horcm0

With this configuration files I have two groups:

copy1 (04:00 -> 05:10, 04:01 -> 05:11) and copy2 (10:00 -> 11:10, 10:01 -> 11:11)

and I can start to copies:

paircreate -g copy1 -pid 2 -vl

paircreate -g copy2 -pid 2 -vl

Can I create with LDEVG a group that include the device names of copy1 and copy2, referencing to the group-names and not to the devices of the groups. Example:

HORCM_LDEVG

copy1 copyall 65238

copy2 copyall 65238

So I can start paircreate in this way:

paircreate -g copyall -pid 2 -vl

Am I wrong?

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Dang Luong

@ Javier Arjona on Oct 2, 2014 5:55 PM

You're on the right track. The overall process would be:

Use raidcom to create a device group
Example: raidcom add device_grp -device_grp_name copy1 dev1 -ldev_id 04:00
raidcom add device_grp -device_grp_name copy1 dev2 -ldev_id 04:01
Use raidcom to create a copy group containing the device group created above
Example: raidcom add copy_grp -copy_grp_name oracle_primary copy1
Modify HORCM to contain:
HORCM_LDEVG
oracle_primary copy1 65238
Create the pair
paircreate -g oracle_primary...

Hope this helps.

Regards,

Dang Luong

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Nathan Kippen @ Dang Luong on May 14, 2015 10:03 AM

Dang,

I have a question..

In the CCI manual it says:

When grouping LDEVs, if HORCM_LDEVG on the primary side and secondary side is not defined, the read operation of CCI is different depending on the command device settings. (See Table 3-6).

What is this talking about?

Also the manual says:

For Virtual Storage Platform storage systems, CCI can be used to create a group of multiple LDEVs by defining device groups. This is accomplished by defining device groups in either the primary or secondary configuration

definition file, but not both. By defining a device group, LDEV information can be changed or defined in one operation. It is not required to modify LDEV information in both configuration definition files.

(pg 3-24) MK-90RD7010-06

I can create LDEV Groups with a single instance and a command device. I dont need any groups defined in a defintion file.

The manual leads me to believe that under certain conditions I only need to define one HORCM instance for certain operations, .. which operations are those?

If two configuration files (horcm0 & horcm1) are required for pair operations, what's the purpose of creating a copy group if I can specify a group name in the horcm files without creating one (raidcom add copy_grp ...)

Taking the above example, in my own experience I've proven that you don't have to create the "oracle_primary" copy group.

You can simply define your horcm files and reference the device groups under LDEVG parameters without having to run raidcom add copy_grp. You can just make up a group name for your device groups:

whatever_ABC copy1 [serialnum] [MU]

"whatever_ABC" doesn't need to be an existing copy group on the array.

Not sure what the point of creating copy groups are using raidcom.

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Dang Luong

@ Nathan Kippen on May 15, 2015 4:53 PM

Hi Nathan,

I also like to define my copy groups within HORCM like you do. But there are some extra added benefits by defining the copy group in the array. For example, the information is centralized. You can operate the copy group from any server where HORCM is installed. Another benefit is that the copy group information is pretty safe because the array has a lot of redundancy built-in versus a single commodity server running HORCM.

I don't think one method is better than the other. It's just a matter of preference.

Regards,

Dang Luong

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5 Replies

Dang Luong Oct 2, 2014 9:32 AM
Mark Correct
Correct Answer
Hi Javier,

HORCM_LDEVG is a group of volumes. You can create agroup and define volumes that belong in the group using raidcom (part of CCI). The definitions are saved on the array. This is different from the groups defined in HORCM_LDEV in that those reside in HORCM files on CCI servers.

Your error sounds like that HORCM_LDEVG hasn't been created on the array. The manual CCI User Reference has a section on defining copy groups that is pretty good. It's called "Define device group".

Regards,
Dang Luong
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- Javier Arjona @ Dang Luong on Oct 2, 2014 12:21 PM
  Mark Correct
  Correct Answer
  Tkanks Dang,
  
  I'm not shure what can I do with HORCM_LDEVG, but I will try to explain that. Let's see the folloing example:
  
  horcm0.conf definition:
  HORCM_LDEV
  copy1    dev1       65238    04:00 0
  copy1    dev2       65238    04:01 0
  copy2    dev3       65238    10:00 0
  copy2    dev3       65238    10:01 0
  HORCM_INST
  copy1    localhost horcm1
  copy2    localhost horcm1
  
  horcm1.conf definition:
  HORCM_LDEV
  copy1    dev1       65238    05:10 0
  copy1    dev2       65238    05:11 0
  copy2    dev3       65238    11:10 0
  copy2    dev4       65238    11:11 0
  HORCM_INST
  copy1    localhost horcm0
  copy2    localhost horcm0
  
  With this configuration files I have two groups:
       copy1 (04:00 -> 05:10, 04:01 -> 05:11) and copy2 (10:00 -> 11:10, 10:01 -> 11:11)
  and I can start to copies:
       paircreate -g copy1 -pid 2 -vl
       paircreate -g copy2 -pid 2 -vl
  
  Can I create with LDEVG a group that include the device names of copy1 and copy2, referencing to the group-names and not to the devices of the groups. Example:
  
  HORCM_LDEVG
  copy1    copyall   65238
  copy2    copyall   65238
  
  So I can start paircreate in this way:
  paircreate -g copyall -pid 2 -vl
  
  Am I wrong?
  Like • Show 0 Likes0
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  - Dang Luong @ Javier Arjona on Oct 2, 2014 5:55 PM
    Unmark Correct
    Correct Answer
    You're on the right track. The overall process would be:
    
    Use raidcom to create a device group
    Example: raidcom add device_grp -device_grp_name copy1 dev1 -ldev_id 04:00
    raidcom add device_grp -device_grp_name copy1 dev2 -ldev_id 04:01
    Use raidcom to create a copy group containing the device group created above
    Example: raidcom add copy_grp -copy_grp_name oracle_primary copy1
    Modify HORCM to contain:
    HORCM_LDEVG
    oracle_primary copy1 65238
    Create the pair
    paircreate -g oracle_primary...
    
    Hope this helps.
    
    Regards,
    Dang Luong
    Like • Show 0 Likes0
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    - Nathan Kippen @ Dang Luong on May 14, 2015 10:03 AM
      Mark Correct
      Correct Answer
      Dang,
      
      I have a question..
      
      In the CCI manual it says:
      
      When grouping LDEVs, if HORCM_LDEVG on the primary side and secondary side is not defined, the read operation of CCI is different depending on the command device settings. (See Table 3-6).
      
      What is this talking about?
      
      Also the manual says:
      
      For Virtual Storage Platform storage systems, CCI can be used to create a group of multiple LDEVs by defining device groups. This is accomplished by defining device groups in either the primary or secondary configuration
      definition file, but not both. By defining a device group, LDEV information can be changed or defined in one operation. It is not required to modify LDEV information in both configuration definition files.
      
      (pg 3-24) MK-90RD7010-06
      
      I can create LDEV Groups with a single instance and a command device. I dont need any groups defined in a defintion file.
      
      The manual leads me to believe that under certain conditions I only need to define one HORCM instance for certain operations, .. which operations are those?
      
      If two configuration files (horcm0 & horcm1) are required for pair operations, what's the purpose of creating a copy group if I can specify a group name in the horcm files without creating one (raidcom add copy_grp ...)
      
      Taking the above example, in my own experience I've proven that you don't have to create the "oracle_primary" copy group.
      
      You can simply define your horcm files and reference the device groups under LDEVG parameters without having to run raidcom add copy_grp. You can just make up a group name for your device groups:
      
      whatever_ABC copy1 [serialnum] [MU]
      
      "whatever_ABC" doesn't need to be an existing copy group on the array.
      
      Not sure what the point of creating copy groups are using raidcom.
      Like • Show 0 Likes0
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      - Dang Luong @ Nathan Kippen on May 15, 2015 4:53 PM
        Mark Correct
        Correct Answer
        Hi Nathan,
        
        I also like to define my copy groups within HORCM like you do. But there are some extra added benefits by defining the copy group in the array. For example, the information is centralized. You can operate the copy group from any server where HORCM is installed. Another benefit is that the copy group information is pretty safe because the array has a lot of redundancy built-in versus a single commodity server running HORCM.
        
        I don't think one method is better than the other. It's just a matter of preference.
        
        Regards,
        Dang Luong
        Like • Show 0 Likes0
        Actions

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