lvcreate -r "relocate" option

[Stephanie Nicholls]

In the past when I have created lv's on EMC Symmetrix frames I have always used the -r N option - disable bad block relocation. Now Im at a site that uses XP256/512's and wondering which is the best option for -r to use for this hardware?

Thanks

Steph

[Michael Tully]

Hi,

I've read posts in here that the XP looks after bad block relocation similar to EMC. Unfortunately I've not see any documentary evidence to support this. I am quite aware of this facility with EMC.

Michael

[Tom Geudens]

Hi,
I just took a look at the manual for the XP512 and in there they create a logical volume without specifying the "-r" option. Also (as my teacher here at HP education tells me) it seems to be the case that bad block relocation on a software level (LVM) is only used IF the array does not take action itself ...

Hope this helps,
Tom

[Keith Clark · Accepted solution]

It works exactly the same as the EMC's, you should set relocate to None.

This is true for almost any modern Hardware Disk Array.Most disk arrays handle bad block relocation on there own, so if the array relocates the block and LVM relocates the block, where's the block? Could create some issues.

The bad block relocation feature is really meant for JBOD's

[PIYUSH D. PATEL]

Hi,

I too have worked with EMC Symmetrix and we had also kept this option to none since EMC recommended the same. The latest hardwares are designed in such a way that they can handle the bad block relocation by itself.

Piyush

[George Petrides_1]

We had one of the first XP256s (the label was actually E MC256) and an army of engineers came to install it and told us to disable the bad block rellocation on the host level. Hope this helps.
George