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тАО10-13-2005 06:14 AM
тАО10-13-2005 06:14 AM
Dirty Region Logs for LSM mirrored volumes
Focusing on the storage: I'd like to mirror my data, using LSM, between the two storage arrays.
I believe that the "defaults" are not optimal. I think I want a DRL on each EMA array. (default seems to be create only one DRL, which means that it will reside on only one EMA array - failure of that array will nuke my DRL)
Here's what I think I need to do:
1) on each EMA array, present two LUNs to each host. I'll simplify:
hosta: dsk1 (50GB) dsk2 (1GB) dsk11 (50GB) dsk12 (1GB)
hostb: dsk1 (50GB) dsk2 (1GB) dsk11 (50GB) dsk12 (1GB
2) Initialize disks under LSM:
voldisksetup -i dskn (repeat for each disk)
3) Build disk group
voldg init
4) Build volume
volassist -g
5) Add second (mirror) plex:
volassist -g
6) Add DRL plex:
volassist -g
7) Add 2nd DRL plex:
volassist -g
Am I missing something?
Thanks in advance.
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тАО10-13-2005 10:16 PM
тАО10-13-2005 10:16 PM
Re: Dirty Region Logs for LSM mirrored volumes
With V5, LSM automatically allocates the configuration copies. They may all end up on the same array, which leaves you with an unusable configuration should that array fail. The best practice describes how to deal with this.
BTW. Note that the use of LSM for Disaster Tolerance is NOT supported by HP. You didn't say that that is the goal that you're trying to achieve, but I just want to be clear about this.
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тАО10-14-2005 02:07 AM
тАО10-14-2005 02:07 AM
Re: Dirty Region Logs for LSM mirrored volumes
And I disagree with your statement about LSM and disaster tolerance. Although LSM has many limitations with TruCluster, it is supported for what we are trying to do.
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тАО10-14-2005 06:08 AM
тАО10-14-2005 06:08 AM
Re: Dirty Region Logs for LSM mirrored volumes
I did try to say that what you are trying to do is supported. However using it for Disaster Tolerance is definitely NOT supported. The difference is subtle, but very important. Disaster Tolerance implies protecting against cascading failures. Typically people do this by introducing distance into the configuration. However introducing distance, by itself, does not offer Disaster Tolerance.
In other words, the configuration you use is supported. But if your intention is to protect yourself against the loss of data in the event of a disaster, then we suggest that you consider a form of hardware replication with Tru64 UNIX (such as EVA/CA, XP/CA or HSG80 DRM).
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тАО10-14-2005 06:16 AM
тАО10-14-2005 06:16 AM
Re: Dirty Region Logs for LSM mirrored volumes
Let me take a look at the document you referenced.
-tjh