zfs: what are the USES for clones? What make possible/easier?
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From: David Combs on 12 Jun 2010 04:45 just wondering. Lotsa stuff in 10-doc about "clones". What are the primary uses of them, ie why were they invented? And, what OTHER things have they turned out useful for? THANKS! David
From: Thomas Tornblom on 12 Jun 2010 09:29 dkcombs(a)panix.com (David Combs) writes: > just wondering. Lotsa stuff in 10-doc about "clones". > > What are the primary uses of them, ie why were they > invented? Updates using beadm or live upgrade uses clones. You clone the current boot environment and then update that. Really nice to be able to jump between the different BE:s. I frequently clone my current BE when I want to test something new. If it didn't work, I just go back to the old BE and throw away the new BE. > > > And, what OTHER things have they turned out useful for? > > > THANKS! > > > David > > Thomas
From: Andrew Gabriel on 12 Jun 2010 15:18 In article <x0d3vw5qgx.fsf(a)hax.se>, Thomas Tornblom <thomas(a)Hax.SE> writes: > dkcombs(a)panix.com (David Combs) writes: > >> just wondering. Lotsa stuff in 10-doc about "clones". >> >> What are the primary uses of them, ie why were they >> invented? > > Updates using beadm or live upgrade uses clones. You clone the current > boot environment and then update that. Really nice to be able to jump > between the different BE:s. > > I frequently clone my current BE when I want to test something new. If > it didn't work, I just go back to the old BE and throw away the new BE. Also for rapidly creating zones which are identical. Typically, you might create a golden master (which you don't normally have running), and you can then create new zones from it in a matter of seconds, and of course at miniscule cost in extra disk space. Also works with T-series LDoms if hosted on zvols via the i/o domain. The concept of a golden image which you clone has many other applications too. A good one is a test area which starts off in a known/good state because you cloned it from a golden master image. After running tests, you don't bother trying to get the test area back into a good state, you just blow it away and reclone from the master. -- Andrew Gabriel [email address is not usable -- followup in the newsgroup]
From: David Combs on 24 Jun 2010 03:16
In article <hv0mj3$iu6$2(a)news.eternal-september.org>, Andrew Gabriel <andrew(a)cucumber.demon.co.uk> wrote: >In article <x0d3vw5qgx.fsf(a)hax.se>, > Thomas Tornblom <thomas(a)Hax.SE> writes: >> dkcombs(a)panix.com (David Combs) writes: >> >>> just wondering. Lotsa stuff in 10-doc about "clones". >>> >>> What are the primary uses of them, ie why were they >>> invented? >> >> Updates using beadm or live upgrade uses clones. You clone the current >> boot environment and then update that. Really nice to be able to jump >> between the different BE:s. >> >> I frequently clone my current BE when I want to test something new. If >> it didn't work, I just go back to the old BE and throw away the new BE. > >Also for rapidly creating zones which are identical. Typically, you >might create a golden master (which you don't normally have running), >and you can then create new zones from it in a matter of seconds, >and of course at miniscule cost in extra disk space. >Also works with T-series LDoms if hosted on zvols via the i/o domain. > >The concept of a golden image which you clone has many other applications >too. A good one is a test area which starts off in a known/good state >because you cloned it from a golden master image. After running tests, >you don't bother trying to get the test area back into a good state, you >just blow it away and reclone from the master. > >-- >Andrew Gabriel >[email address is not usable -- followup in the newsgroup] Thanks! David |