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тАО05-12-2017 09:35 AM
тАО05-12-2017 09:35 AM
I am planning to create a file system. With four 7TB SAN luns. So wondering how to create:
#vgcreate -s 64 -e ........
Please suggest the recommendations to follow.
Thank you.
Solved! Go to Solution.
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тАО05-12-2017 09:44 AM
тАО05-12-2017 09:44 AM
Re: Create a volume group, with (4) 7 TB storage luns
There are different ways to create the volume group depending on your version of HP-UX.
What version are you running?
Bill Hassell, sysadmin
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тАО05-12-2017 10:06 AM
тАО05-12-2017 10:06 AM
Re: Create a volume group, with (4) 7 TB storage luns
11.31 version
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тАО05-12-2017 10:55 AM
тАО05-12-2017 10:55 AM
Re: Create a volume group, with (4) 7 TB storage luns
From the man page: vgcreate -V 2.2 -s pe_size -S vg_size vg_name pv_name ...
For your example,
pvcreate /dev/rdisk/pv1 (repeat for LUNs pv2 pv3 and pv4)
vgcreate -V 2.2 -s 256 -S 28t vgSomeName /dev/disk/pv1 ... /dev/rdisk/pv4
vgcreate will create the /dev/vgSomeName directory and group file.
Bill Hassell, sysadmin
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тАО05-12-2017 11:39 AM
тАО05-12-2017 11:39 AM
Re: Create a volume group, with (4) 7 TB storage luns
Thank you so much, Bill
Created file system and successful.
Quick question, scsimgr set_attr -D /dev/rdisk/disk13 -a max_q_depth=64. I do set queue_depth for better performance. Is that helping or not. ANy ideas?
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тАО05-12-2017 07:17 PM - edited тАО05-13-2017 11:05 AM
тАО05-12-2017 07:17 PM - edited тАО05-13-2017 11:05 AM
Re: Create a volume group, with (4) 7 TB storage luns
The max_q_depth=64 is fine. The default is 8, pretty low for high performance disk arrays and servers. 64 is a good starting value but actual improvement is dependent on the server's performance, the number of separate processes initiating disk I/O at the same time, alternate links, switch speed, array queue settings, striping and so on... In other words, it depends. You can change it at any time but you'll need repeatable workload to test the improvement if any. You can use sar -d 5 10 to look the disk queues. Lower values are desirable but if changes to the max_q_depth value do not appreciably change the disk queue sizes, then the current setting is fine.
Bill Hassell, sysadmin
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тАО05-17-2017 07:53 AM