zfs snapshots for TAPE backup: 1: must be of entire pool? 2: if yes, then need TWICE as much disk?
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From: nelson on 16 Feb 2010 16:02 > When you make a snapsnot that you want to put onto a tape for off-site > backup, is it the entire pool you have to snapshot? it can be, but doesn't have to be. it's at the filesystem/volume level > Now, a snapshot that is to go to tape will of course contain EVERYTHING > descending from that point (entire pool?). depends on whether you're using volumes within a pool > And before tarring it off, doesn't it have to first be on disk, and then > you write it from there? not sure i follow, it's early and i need coffee but you can access the snapshot under the ZFS-volume-path/.zfs/snapshot/$SNAPSHOTNAME. you could also clone it and mount it somewhere else or ZFS send it. > Like maybe you want to bzip2 the thing first? (So it fits on the tape.) could certainly pipe a send through some form of compression or have the tape handle it
From: AZ Nomad on 17 Mar 2010 00:37 On Wed, 17 Mar 2010 04:15:26 +0000 (UTC), David Combs <dkcombs(a)panix.com> wrote: >>There is much to be said for taking your backup to a test system, >>booting that system from CD/DVD and actually restoring your file >>systems! If you do this, you will KNOW that you CAN do this. Or if >>things do not go well, you KNOW that you CAN'T restore successfully and >>that you will need to take corrective action. >> >>You DO NOT want to become the guy who could not restore his employer's >>accounts receivable! That could mean that your only recourse is to >>attend "Hamburger University" and get a job managing a McDonald's! >> >>And it's not JUST accounts receivable. Files of many sorts can and >>probably will contain business critical information. >> >>Consider whether the extra time to "unbzip" before you can restore is >>going to be critical. Is bzip on the install CD/DVD? If not, where is >>it and how are you going to install it? Can bzip run standalone or must >>the O/S be installed in order for bzip to work? >> >>Whether a backup fits on one tape or two is one of the LAST things to >>worry about! >If I haven't responded before, I do it now. >VERY WELL STATED! not really. A company with an employer's accounts receivables worth more than the price of a tape drive will have the resources to assemble a running solaris system. In reality, it'll have a system ready to take over in a moment's notice in case of hardware failure of the primary system. No need to boot off optical media. No need to have less than a full system. Still a good idea to do a dry run. That applies to any backup scheme.
From: AZ Nomad on 17 Mar 2010 10:20 On Thu, 18 Mar 2010 09:35:33 -0400, Richard B. Gilbert <rgilbert88(a)comcast.net> wrote: >AZ Nomad wrote: >> On Wed, 17 Mar 2010 04:15:26 +0000 (UTC), David Combs <dkcombs(a)panix.com> wrote: >>>> There is much to be said for taking your backup to a test system, >>>> booting that system from CD/DVD and actually restoring your file >>>> systems! If you do this, you will KNOW that you CAN do this. Or if >>>> things do not go well, you KNOW that you CAN'T restore successfully and >>>> that you will need to take corrective action. >>>> >>>> You DO NOT want to become the guy who could not restore his employer's >>>> accounts receivable! That could mean that your only recourse is to >>>> attend "Hamburger University" and get a job managing a McDonald's! >>>> >>>> And it's not JUST accounts receivable. Files of many sorts can and >>>> probably will contain business critical information. >>>> >>>> Consider whether the extra time to "unbzip" before you can restore is >>>> going to be critical. Is bzip on the install CD/DVD? If not, where is >>>> it and how are you going to install it? Can bzip run standalone or must >>>> the O/S be installed in order for bzip to work? >>>> >>>> Whether a backup fits on one tape or two is one of the LAST things to >>>> worry about! >> >>> If I haven't responded before, I do it now. >> >>> VERY WELL STATED! >> not really. >> >> A company with an employer's accounts receivables worth more than the >> price of a tape drive will have the resources to assemble a running >> solaris system. In reality, it'll have a system ready to take over >> in a moment's notice in case of hardware failure of the primary system. >> >> No need to boot off optical media. No need to have less than a full >> system. >> >Well, maybe! Some companies can and do have a hardware configuration >and software that allows another system to "step in and pick up the >load." You'd better believe that it's not cheap! I wasn't talking about AR for amazon.com.
From: AZ Nomad on 25 Mar 2010 10:09
On Thu, 25 Mar 2010 06:31:37 +0000 (UTC), David Combs <dkcombs(a)panix.com> wrote: >In article <kd6dnZe-Xs4mRz3WnZ2dnUVZ_vOdnZ2d(a)giganews.com>, >Richard B. Gilbert <rgilbert88(a)comcast.net> wrote: >>AZ Nomad wrote: >>It's all done by computer now and God help us if the computers fail. >That's right -- it's ALL done by computer -- witness the Prius and its >problems. >God help us is someone does a Dr. Strangelove via a 50MTon or several >exploding what, 50 miles up over the U.S., frying 60 jillion chips. >We'd all starve to death -- trucks, cars, trains, power-plants, switching- >stations -- NOTHING would work. 1999 is on the phone; they want their hysteria back. |