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259 Posts
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3136
March 14th, 2012 06:00
adding tdats to thin pool
We had disks added to our vmax and the ce created the datadevices and tdats. using SMC, I added the tdats into my thin pool (they were in disabled state to add). the thinpool shows status of 'balancing' but the devices I added are still reporting as 'disabled' and 'inactive'.Is this normal? or do I need to manually change the state to Enabled?
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rajshekhar1
30 Posts
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March 14th, 2012 07:00
Like Dynamox said "devices can exist in a thin pool and be in a disabled state, but disabled devices are not available for extent allocation".
I used command line many times in similar situation where I enabled only the TDAT's that were in disabled state but never did enable on all. I am not sure about options it will show if you try it through SMC.
The command line option to enable only the "disabled: devices is as follows:-
symconfigure -sid 123 -cmd "enable dev XXXX:YYYY in pool Test_Pool type=thin;" commit
Where XXXX:YYYY is the device range for the disabled devices in the pool
I will not recommend doing enable on all the TDAT's in the pool.
Quincy561
1.3K Posts
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March 14th, 2012 06:00
When I add TDATs to a pool I always use the member_state = ENABLE flag.
jimkunysz
259 Posts
0
March 14th, 2012 07:00
so, i guess I'll need to manually enable them, then. any issues enabling them while they are in the pool?
jimkunysz
259 Posts
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March 14th, 2012 07:00
ok, thanks. I'll do that. Assuming the state stays disabled after the balancing has completed, the option is to enable ALL the devices in the pool, not just the selected data devices I added. Any expected issues performing an enable on ALL tdats in the pool?
dynamox
9 Legend
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20.4K Posts
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March 14th, 2012 07:00
interesting, i thought when device is in disabled state it can't be used for rebalancing. I would wait for rebalance to finish and check the state
Quincy561
1.3K Posts
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March 14th, 2012 07:00
My guess is only the old active TDATs are rebalancing.
sracharla
49 Posts
1
March 14th, 2012 08:00
I am not sure if you can at all enable all the devices in pool, even if they are in enabled state already. I'd enable only the devices that are in disabled state.
And I don't think if the disabled devices are also being balanced, I'd also guess as Quincy that only the remaining TDATS(not the disabled ones) are being balanced.
To confirm, I'd run the following command to see if the disabled devices are being balanced.
symcfg -sid show -pool -thin all
or
symcfg -sid show -pool -thin all -detail(to also see the bound thin devices allocation)
and look for the used tracks or %Full columns to check if the diabled devices are also being balanced.
jimkunysz
259 Posts
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March 14th, 2012 09:00
thanks guys, I don't think there are enough points to allocate as you have all been very helpful. I was able to use the cli and just enable the tdats I added and they now show Enabled/Active in the pool.
dynamox
9 Legend
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20.4K Posts
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March 14th, 2012 10:00
now run the rebalance to spread the capacity onto the new TDATs.
jimkunysz
259 Posts
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March 14th, 2012 11:00
it appears to re-balancing automatically as I see used tracks and used(MB) on the new devices already and the #'s are increasing.
RobertDudley
2 Intern
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448 Posts
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March 14th, 2012 11:00
the default is to automatically rebalance the pool when new TDAT's are added.
anoop_cr
3 Posts
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October 19th, 2012 05:00
Hi All,
From which code level onwards automatical rebalance set as default ?
elearning
1 Rookie
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51 Posts
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October 20th, 2012 08:00
hi
from technical notes 300-006-718 17/10/2012
"Beginning with Enginuity 5875 two new attributes have been added that provide administrators more control over the pool rebalancing feature.
The first new attribute is the rebalancing variance percent. This attribute sets a target percentage for the variance in utilization for any data device as measured against the thin pool’s utilization. The default value for this attribute is 1 and it can be changed to any value between 1 and 50."