Hello Dan and Josh,
Sorry, I totally misunderstood the situation here.
It seems to me that data spooling is useful to avoid the tape library be
waiting for data from various slow clients.
I think the LTO-4 drive (120 MB/s full height) write speed and 1GB network
will be the bottleneck. If you could use both drives for writing, then they
would be waiting for data if you have a 1GB network (125 MB/s) and data
coming from only one source (the SD with the original disk volume backups).
Maybe fast disks (or disk arrays) and both hosts using NIC bonding or 10GB
network there would be a gain in performance using concurrent copy jobs.
The local SSD for data spooling seems to me will bring you no gain.
Best regards,
Ana
On Tue, Feb 9, 2016 at 2:30 PM, Josh Fisher <jfis...@pvct.com> wrote:
>
> On 2/8/2016 5:42 PM, Dan Langille wrote:
>
> Hello,
>
> I am working with an LTO-4 tape library. It has two drives but I plan to
> write to only one for backups.
>
> I will backup to disk first, on another SD. Later, I will copy the jobs
> to the tape library on this new SD
> which is on another server. The copy jobs will be spooled to local SSD
> before being written to tape.
>
> re
> http://bacula-users.narkive.com/QRkTVfEz/typical-tape-write-performance
>
> Now what I'm thinking of is streaming multiple concurrent jobs to a single
> drive
>
>
> Are the two servers on a 10G or better network? Unless the disk subsystem
> on the other SD is slow, it will likely stream close to the 1G max of 125
> MB/s, since it will be essentially sequential reads. I'm not convinced that
> concurrency will gain anything.
>
> .
>
> Sure, downside on restore is interleaving of blocks....
>
> I don't see any downsides to going down this path. I have yet to run any
> copy jobs to the new library,
> but it may be ready this week.
>
> Comments?
>
> --
> Dan Langille - BSDCan / PGCon
> d...@langille.org
>
>
>
>
>
>
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