AO conundrum??
Posted: Tue Jan 06, 2015 6:44 am
Hi
I was wondering if someone more experienced in 3PAR can help me with this conundrum. I recently started a new job and this is the first time I’ve dealt with SANs and HP 3PAR in particular. We have a 3 tiered 3PAR system in place with total storage capacity of approx. 55TB as follows:
Tier0 – SSD 2.6TB (7% free)
Tier1 – FC 22TB (70% free)
Tier2 – NL 30TB (1.92% free)
We keep on getting alerts (major) that SSD raw space usage is above 85% and NL raw capacity is above 95%. All our CPGs are configured to use all 3 tiers in performance mode but it seems AO is mainly using tier0 (SSD) and tier2 (NL) and under utilising Tier1 – can someone explain why this is happening?
To address this I made a change to one of the AO configurations and removed tier2 leaving only tier0 and tier1 in the hope that AO will shift data from NL to FC but after leaving this for over 24 hours no data appears to have moved from NL to FC. Is this the right way to shift data about or is it better to simply create a new 2 tiered CPG and move the virtual volumes on there instead?
If anyone can help me and provide advice on how best to configure our CPGs and AO so as to avoid generating free capacity alerts that would be greatly appreciated.
Many thanks
I was wondering if someone more experienced in 3PAR can help me with this conundrum. I recently started a new job and this is the first time I’ve dealt with SANs and HP 3PAR in particular. We have a 3 tiered 3PAR system in place with total storage capacity of approx. 55TB as follows:
Tier0 – SSD 2.6TB (7% free)
Tier1 – FC 22TB (70% free)
Tier2 – NL 30TB (1.92% free)
We keep on getting alerts (major) that SSD raw space usage is above 85% and NL raw capacity is above 95%. All our CPGs are configured to use all 3 tiers in performance mode but it seems AO is mainly using tier0 (SSD) and tier2 (NL) and under utilising Tier1 – can someone explain why this is happening?
To address this I made a change to one of the AO configurations and removed tier2 leaving only tier0 and tier1 in the hope that AO will shift data from NL to FC but after leaving this for over 24 hours no data appears to have moved from NL to FC. Is this the right way to shift data about or is it better to simply create a new 2 tiered CPG and move the virtual volumes on there instead?
If anyone can help me and provide advice on how best to configure our CPGs and AO so as to avoid generating free capacity alerts that would be greatly appreciated.
Many thanks