[OpenIndiana-discuss] ZFS 0+1 across disparate drives

[Michelle]

It is a possibility, but LTO-8 drives are still £3,000+ for just the
drive. The drive would also then be the weakest link, and quite an
expensive one.

With 10Tb NAS drives coming in at £300 each, that's £1,200 for four
drives with 30Tb capacity at RaidZ. An extra as spare, or two extras
for RaidZ2 and a spare, and you still haven't broken £2,000.

Michelle.


On Thu, 2021-12-02 at 19:55 +0100, stes at PANDORA.BE wrote:
> I have only read this thread very superficially, but LTO tape (linear
> tape open)
> 
> https://en.wikipedia.org/wiki/Linear_Tape-Open
> 
> LTO-8 has native raw capacity of about 12TB so attaching a LTO-8
> drive may be an option.
> 
> The same page says, by the way, that LTO-9 is supposed to have 18TB
> native capacity,
> but "delayed to late 2021" (which is now).
> 
> Given the fact that the compressed capacity of LTO-8 is 30TB you are
> probably still well below the limits of a single LTO8 tape,
> that is, it is quite possible that if you have less than 30TB of
> data, you can make a backup to a LTO-8 drive.
> 
> Regards,
> David Stes
> 
> ----- Op 1 dec 2021 om 18:08 schreef Mehmet Erol Sanliturk 
> m.e.sanliturk at gmail.com:
> 
> > On Wed, Dec 1, 2021 at 2:55 PM Michelle <michelle at msknight.com>
> > wrote:
> > 
> > > I'm trying to achieve a resilient way of bringing together all my
> > > older
> > > drives for a backup solution using scraps of whatever I can get
> > > my
> > > hands on.
> > > 
> > > I have closing on 12TB of data so even the 10 won't be enough to
> > > back
> > > everything up, but this is as much for the exercise of doing it,
> > > as
> > > achieving anything solid. It won't be under pressure, but I'd
> > > rather
> > > push the envelope and see what I can do.
> > > 
> > > So how would the command go?
> > > 
> > > zpool create tank raidz mirror drive1 drive2 mirror drive3 drive4
> > > drive5
> > > 
> > > ...which is where I come unstuck with the 2TB drive in the mix.
> > > 
> > > 
> > > 
> > 
> > 
> > 
> > A few days ago I lost many weeks of work because my drive #1 / 3
> > died , not
> > synchronized into  #2 / 3 and  #3 / 3 .
> > This made the computer unbootable .
> > I replaced the failed disk and synchronized it  with #2 .
> > The disk #3 failed and made the computer unbootable .
> > I replaced that disk and synchronized it  with #2 .
> > 
> > The #1 disk was new but bought  approximately 5 year ago .
> > 
> > You are saying your disks are older .
> > 
> > One "safe" but slow choice would be the following .
> > 
> > Use external USB docks for each of your disks and make their file
> > systems
> > compatible
> > with your computer ( if your disks have other file systems ) .
> > 
> > With your synchronization shell scripts (1) mount  (2) rsync (3)
> > un_mount
> > your drives
> > by using cron or ( manually which this option is not a good choice
> > ) .
> > 
> > If any one of your disks fails , it will not affect your computer .
> > This will be slow but without any other harm .
> > 
> > 
> > The most suitable additional action may be to backup your data to
> > external
> > disks
> > regularly . These disks will not be continuously connected to the
> > computer
> > and will not be affected  by electricity harmful effects .
> > 
> > 
> > 
> > OR
> > 
> > You may use another computer ( such as a single board computer ) as
> > an NFS
> > server
> > ( or a NAS if one is available to you ) , and use your drives in
> > that
> > server .
> > Then synchronize your drives from your computer . If any disk fails
> > , it
> > only affects the server
> > but your computer continues to work without affection .
> > 
> > 
> > 
> > Mehmet Erol Sanliturk
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > > On Wed, 2021-12-01 at 11:17 +0000, James wrote:
> > > > On 01/12/2021 08:31, Michelle wrote:
> > > > > Say I was to put a 2tb, three 4tb and a 6tb together (a 2 and
> > > > > two 4
> > > > > would make 10 and the other 4 and the 6 would also make 10)
> > > > > 
> > > > > Would that be possible with ZFS now?
> > > > 
> > > > I think it has always been possible, ask is is sensible?  Try
> > > > it, if
> > > > you
> > > > have nothing to loose.  The problem is if one drive fails is
> > > > takes
> > > > out
> > > > all of one side of the mirror.
> > > > 
> > > > Why not use 2 separate 4TB mirrors?  4&4 = 4, 4&6 = 4, total
> > > > 8.  You
> > > > loose the 2TB drive completely but (guessing) it is the slowest
> > > > and
> > > > oldest.  You ignore 2TB of the 6.
> > > > 
> > > > You don't say what you are trying to achieve but it's unlikely
> > > > you
> > > > have
> > > > the full 8TB of data, it is unlikely it can't be split.
> > > > 
> > > > 
> > > > 
> > > > 
> > > > 
> > > > _______________________________________________
> > > > openindiana-discuss mailing list
> > > > openindiana-discuss at openindiana.org
> > > > https://openindiana.org/mailman/listinfo/openindiana-discuss
> > > 
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