That was my point - having spares is always a good idea and I don't consider it 'waste'. This means the root volume will waste a few GB, like any other volume.
Glenn
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From: genO [mailto:genec220@verizon.net] Sent: Tuesday, January 20, 2009 12:59 PM To: G.Milazzo@sinergy.it; toasters@mathworks.com Cc: Glenn Walker Subject: RE: 7.3.1 and 2020 nonsense :-)
Giacomo,
You could usea 16TB RAID-DP protected aggregate with multiple flexible volumes, the rootvol being one of those flexvols, as long as you allocate 2 spares.
g
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From: Milazzo Giacomo [mailto:G.Milazzo@sinergy.it] Sent: Tuesday, January 20, 2009 12:02 PM To: Glenn Walker; toasters@mathworks.com Subject: R: 7.3.1 and 2020 nonsense :-)
Maybe something has been not clear for you. The issue is for this nonsense 2020 usage of 7.3.1.
For 2020 and 16TB aggregate only: you must create a SEPARATE aggregate raid dp that will have to contain THE ROOT ONLY, no other volumes, no user data.
If you want you could also use R4...but with 2 spares. The result is the same. For a 2020 using 1 TB SATA disk I will waste 3 TB for root!!! Nonsense...unuseful, ridicoulous...what else? :-)
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Da: Glenn Walker [ggwalker@mindspring.com] Inviato: martedì 20 gennaio 2009 17.27 A: Milazzo Giacomo; toasters@mathworks.com Oggetto: RE: 7.3.1 and 2020 nonsense :-)
I don't see the issue:
Create massive aggregate, use RAID-DP and leave 2 spare disks. Put all data in the one aggregate.
We (as a general rule) do not use a separate aggregate for our root volumes - we just maintain a healthy number of spares and use RAID-DP.
Glenn
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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Milazzo Giacomo Sent: Tuesday, January 20, 2009 7:09 AM To: toasters@mathworks.com Subject: 7.3.1 and 2020 nonsense :-)
Hi all,
reading this from 7.3.1 release note I've been really beated from this. I was thinking to a 2020 full of 1 TB SATA. To have a 16 TB aggregate I should waste 3 TB for few gigs of root! :-)
Luckly I don't think that somebody will suggest a 2020 to manage 16 TB of data!!! :-)
Bye
Increased aggregate capacity for FAS2020 systems
Beginning with Data ONTAP 7.3.1, FAS2020 systems support aggregates up to 16 TB raw capacity,
provided that the root volume is hosted in a dedicated aggregate (that is, one that contains only the root
volume and no user data).
Note: An alternative to maintaining a dedicated root aggregate is to maintain two spare disks. A
dedicated root aggregate configuration of three disks is the recommended best practice for all systems.
However, if such a configuration is not practical in your environment, you must maintain two spare
disks if you configure your FAS2020 system for aggregates larger than 8 TB raw capacity.
If you do not configure aggregates larger than 8 TB raw capacity on your FAS2020 system, the
conditions for two spare disks or a dedicated root aggregate do not apply.
For more information about FAS2020 systems' storage capacity, see the System Configuration Guide.
Dott. Giacomo Milazzo
Technical Account Manager
Sinergy SpA Filiale di Roma * 00148. viale Castello della Magliana, 38
' (+39) 3406001045 0665970252
7 +39 02 26922048 * Giacomo.Milazzo@Sinergy.it
