nanog mailing list archives
Re: DNS caches that support partitioning ?
From: Mark Andrews <marka () isc org>
Date: Mon, 20 Aug 2012 07:37:31 +1000
In message <DDF607B5-415B-41E8-9222-EB549D3DBB0C () semihuman com>, Chris Woodfiel d writes:
What Patrick said. For large sites that offer services in multiple data = centers on multiple IPs that can individually fail at any time, 300 = seconds is actually a bit on the long end. -C
Which is why the DNS supports multiple address records. Clients don't have to wait a minutes to fallover to a second address. One doesn't have to point all the addresses returned to the closest data center. One can get sub-second fail over in clients as HE code shows. As for the original problem. LRU replacement will keep "hot" items in the cache unless it is seriously undersized. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- DNS caches that support partitioning ? John Levine (Aug 17)
- Re: DNS caches that support partitioning ? Andrew Sullivan (Aug 17)
- Re: DNS caches that support partitioning ? valdis . kletnieks (Aug 17)
- Re: DNS caches that support partitioning ? Michael Thomas (Aug 17)
- Re: DNS caches that support partitioning ? Jimmy Hess (Aug 18)
- Re: DNS caches that support partitioning ? Patrick W. Gilmore (Aug 18)
- Re: DNS caches that support partitioning ? Chris Woodfield (Aug 19)
- Re: DNS caches that support partitioning ? Mark Andrews (Aug 19)
- Re: DNS caches that support partitioning ? William Herrin (Aug 19)
- Re: DNS caches that support partitioning ? Jimmy Hess (Aug 19)
- Re: DNS caches that support partitioning ? Gary Buhrmaster (Aug 19)
- Return two locations or low TTL [was: DNS caches that support partitioning ?] Patrick W. Gilmore (Aug 20)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Dobbins, Roland (Aug 20)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Patrick W. Gilmore (Aug 20)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Dobbins, Roland (Aug 20)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Patrick W. Gilmore (Aug 20)
- Re: DNS caches that support partitioning ? valdis . kletnieks (Aug 17)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Mark Andrews (Aug 20)
- Re: DNS caches that support partitioning ? Andrew Sullivan (Aug 17)
- Re: Return two locations or low TTL [was: DNS caches that support partitioning ?] Tony Finch (Aug 20)