Re: dup vs raid1 in single disk

2017-02-08 Thread Austin S. Hemmelgarn
On 2017-02-07 17:28, Kai Krakow wrote: Am Thu, 19 Jan 2017 15:02:14 -0500 schrieb "Austin S. Hemmelgarn" : On 2017-01-19 13:23, Roman Mamedov wrote: On Thu, 19 Jan 2017 17:39:37 +0100 "Alejandro R. Mosteo" wrote: I was wondering, from a point of

Re: dup vs raid1 in single disk

2017-02-08 Thread Alejandro R. Mosteo
On 07/02/17 23:28, Kai Krakow wrote: To be realistic: I wouldn't trade space usage for duplicate data on an already failing disk, no matter if it's DUP or RAID1. HDD disk space is cheap, and using such a scenario is just waste of performance AND space - no matter what. I don't understand the

Re: dup vs raid1 in single disk

2017-02-07 Thread Dan Mons
On 8 February 2017 at 08:28, Kai Krakow wrote: > I still thinks it's a myth... The overhead of managing inline > deduplication is just way too high to implement it without jumping > through expensive hoops. Most workloads have almost zero deduplication > potential. And even

Re: dup vs raid1 in single disk

2017-02-07 Thread Hans van Kranenburg
On 02/07/2017 11:28 PM, Kai Krakow wrote: > Am Thu, 19 Jan 2017 15:02:14 -0500 > schrieb "Austin S. Hemmelgarn" : > >> On 2017-01-19 13:23, Roman Mamedov wrote: >>> On Thu, 19 Jan 2017 17:39:37 +0100 >>> [...] >>> And the DUP mode is still useful on SSDs, for cases when one

Re: dup vs raid1 in single disk

2017-02-07 Thread Kai Krakow
Am Thu, 19 Jan 2017 15:02:14 -0500 schrieb "Austin S. Hemmelgarn" : > On 2017-01-19 13:23, Roman Mamedov wrote: > > On Thu, 19 Jan 2017 17:39:37 +0100 > > "Alejandro R. Mosteo" wrote: > > > >> I was wondering, from a point of view of data safety, if

Re: dup vs raid1 in single disk

2017-01-21 Thread Alejandro R. Mosteo
Thanks Austin and Roman for the interesting discussion. Alex. On 19/01/17 21:02, Austin S. Hemmelgarn wrote: On 2017-01-19 13:23, Roman Mamedov wrote: On Thu, 19 Jan 2017 17:39:37 +0100 "Alejandro R. Mosteo" wrote: I was wondering, from a point of view of data safety,

Re: dup vs raid1 in single disk

2017-01-19 Thread Austin S. Hemmelgarn
On 2017-01-19 13:23, Roman Mamedov wrote: On Thu, 19 Jan 2017 17:39:37 +0100 "Alejandro R. Mosteo" wrote: I was wondering, from a point of view of data safety, if there is any difference between using dup or making a raid1 from two partitions in the same disk. This is

Re: dup vs raid1 in single disk

2017-01-19 Thread Roman Mamedov
On Thu, 19 Jan 2017 17:39:37 +0100 "Alejandro R. Mosteo" wrote: > I was wondering, from a point of view of data safety, if there is any > difference between using dup or making a raid1 from two partitions in > the same disk. This is thinking on having some protection

Re: Fwd: dup vs raid1 in single disk

2017-01-19 Thread Austin S. Hemmelgarn
On 2017-01-19 11:39, Alejandro R. Mosteo wrote: Hello list, I was wondering, from a point of view of data safety, if there is any difference between using dup or making a raid1 from two partitions in the same disk. This is thinking on having some protection against the typical aging HDD that

Fwd: dup vs raid1 in single disk

2017-01-19 Thread Alejandro R. Mosteo
Hello list, I was wondering, from a point of view of data safety, if there is any difference between using dup or making a raid1 from two partitions in the same disk. This is thinking on having some protection against the typical aging HDD that starts to have bad sectors. On a related note, I