[OpenIndiana-discuss] About zpools and usage plan

[David Scharbach]

I forgot to mention I use snapshots on both arrays. My bad. 

----------------------------------
David Scharbach
Mine Senior Electrical Engineer
PCS Cory Division

On 2013-08-03, at 2:45 PM, Martin Frost <me at cs.Stanford.EDU> wrote:

> David, your advice to back up data regularly is good, but rsync'ing
> from one array to another is not the same as backing up.  I don't know
> how often you rsync, but right after you do, you can't restore a file
> you accidentally deleted or clobbered yesterday.  At most you have one
> previous version of the dataset available.
> 
> Although it doesn't sound like you do, maybe you use ZFS's snapshots
> on one of these arrays.  That can provide good backups that date
> back over some amount of time, depending on available disk space for
> retaining the snapshots.  Ideally you would create snapshots on the
> main array and use 'zfs send' to copy them to the backup array, or
> at least create snapshots on the backup array before or after each
> rsync from the main array.
> 
> Martin
> 
>> From: David Scharbach <david.scharbach at mac.com>
>> Date: Sat, 03 Aug 2013 11:28:49 -0600
>> 
>> I use Raid-Z2 for my main array.  6 disks would give you effectively 4 disks usable with the ability to tolerate ANY 2 disk failures.  Mirroring would allow for 3 disk failures ONLY if the failures were in different sets, if I understand mirroring correctly.  There is a risk that the right 2 failures could cause the entire array to be pooched.
>> 
>> Regardless, BACKUP you data regularly.  Do not rely on your production to keep data safe.  I have 2 arrays in my server, an 8 disk RaidZ2 and a 4 disk simple array.  I was to lame to figure out replication so I fell back on an rsync script to ensure my data is in two places.  In a perfect world, I would have it in 2 different physical boxes in different locations but anything of real value is also stored in the cloud (Wuala).
>> 
>> Cheers,
>> 
>> On 2013-08-02, at 9:08 PM, Harry Putnam <reader at newsguy.com> wrote:
>> 
>>> Looking for a little advice about setting up a home lan server.
>>> 
>>> So far just tinkering with a vbox oi as guest install hoping to make
>>> whatever nasty blunders on disposable data and OS.
>>> 
>>> But getting right to it:
>>> 
>>> In a previous life I ran oi and used mirrored sets of discs for
>>> everthing. 
>>> 
>>> Mirrored OS discs, and 2 sets of mirrored data discs.
>>> 
>>> I was advised back then that mirrored sets of discs, given  my small
>>> usage, would be the most secure (not meaning agains penitration or the
>>> like...just keeping data from loss) and handiest way to handle my home
>>> lan.
>>> 
>>> So, wondering what the current thinking is?  Like say, mirrored as
>>> opposed to a collection of discs in raidz or whatever its called.
>>> 
>>> My needs will be well handled by something like 3tb of storage so
>>> something like 6 1tb discs for a mirrored setup.
>>> 
>>> What else could I get with those 6 disks in terms of redundancy and ease
>>> of maintenance?
>>> 
>>> 
>>> _______________________________________________
>>> OpenIndiana-discuss mailing list
>>> OpenIndiana-discuss at openindiana.org
>>> http://openindiana.org/mailman/listinfo/openindiana-discuss
>> 
>> 
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