Date: Tue, 30 Apr 2019 10:28:36 -0400 From: Paul Mather <paul@gromit.dlib.vt.edu> To: Michelle Sullivan <michelle@sorbs.net> Cc: rainer@ultra-secure.de, owner-freebsd-stable@freebsd.org, freebsd-stable <freebsd-stable@freebsd.org>, Andrea Venturoli <ml@netfence.it> Subject: Re: ZFS... Message-ID: <D73696A4-7D14-4782-85E9-001FCDD36EC9@gromit.dlib.vt.edu> In-Reply-To: <70C87D93-D1F9-458E-9723-19F9777E6F12@sorbs.net> References: <30506b3d-64fb-b327-94ae-d9da522f3a48@sorbs.net> <CAOtMX2gf3AZr1-QOX_6yYQoqE-H%2B8MjOWc=eK1tcwt5M3dCzdw@mail.gmail.com> <56833732-2945-4BD3-95A6-7AF55AB87674@sorbs.net> <3d0f6436-f3d7-6fee-ed81-a24d44223f2f@netfence.it> <17B373DA-4AFC-4D25-B776-0D0DED98B320@sorbs.net> <70fac2fe3f23f85dd442d93ffea368e1@ultra-secure.de> <70C87D93-D1F9-458E-9723-19F9777E6F12@sorbs.net>
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On Apr 30, 2019, at 5:05 AM, Michelle Sullivan <michelle@sorbs.net> wrote: > > > Michelle Sullivan > http://www.mhix.org/ > Sent from my iPad > >> On 30 Apr 2019, at 18:44, rainer@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. ;-) Cheers, Paul.
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