Paul Mather paul at gromit.dlib.vt.edu
Tue Apr 30 14:28:46 UTC 2019

On Apr 30, 2019, at 5:05 AM, Michelle Sullivan <michelle at sorbs.net> wrote:

> Michelle Sullivan
> http://www.mhix.org/
> Sent from my iPad
>> On 30 Apr 2019, at 18:44, rainer at ultra-secure.de wrote:
>> Am 2019-04-30 10:09, schrieb Michelle Sullivan:
>>> Now, yes most production environments have multiple backing stores so
>>> will have a server or ten to switch to whilst the store is being
>>> recovered, but it still wouldn’t be a pleasant experience... not to
>>> mention the possibility that if one store is corrupted there is a
>>> chance that the other store(s) would also be affected in the same way
>>> if in the same DC... (Eg a DC fire - which I have seen) .. and if you
>>> have multi DC stores to protect from that.. size of the pipes between
>>> DCs comes clearly into play.
>> I have one customer with about 13T of ZFS - and because it would take a  
>> while to restore (actual backups), it zfs-sends delta-snapshots every  
>> hour to a standby-system.
>> It was handy when we had to rebuild the system with different HBAs.
> I wonder what would happen if you scaled that up by just 10 (storage) and  
> had the master blow up where it needs to be restored from backup.. how  
> long would one be praying to higher powers that there is no problem with  
> the backup...? (As in no outage or error causing a complete outAge.)...  
> don’t get me wrong.. we all get to that position at sometime, but in my  
> recent experience 2 issues colliding at the same time results in  
> disaster.  13T is really not something I have issues with as I can  
> usually cobble something together with 16T.. (at least until 6T drives  
> became a viable (cost and availability at short notice) option...  even  
> 10T is becoming easier to get a hold of now.. but I have a measly 96T  
> here and it takes weeks even with gigabit bonded interfaces when I need  
> to restore.

Such is the curse of large-scale storage when disaster befalls it.

I guess you need to invent a home brew version of Amazon Snowball or Amazon  
Snowmobile. ;-)



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