Re: [Bacula-users] Is Bacula and a LTO drive right for me?
2015-05-20 14:11:54
On 2015-05-20 10:10 AM, Dimitri Maziuk wrote:
> Then why TF are you quoting lto sustained write to hdd random i/o? "Disk
> subsystem can't keep up with modern tape" in the same way apples can't
> keep up with oranges. Compare optimized sustained writes to optimized
> sustained writes or random seek time to random seek time or stop
> spreading fud.
I really don't know what point you think you are making.
What do you call it when multiple backup jobs are writing to disk
storage while at the same time a copy job is reading from that same disk
subsystem and writing to tape? True we're talking about multiple
'sequential' streams at the same time rather than pure random I/O, but
for all intents and purposes that behaves as random I/O since you've now
got seeks involved. You will be hard pressed to sustain more than 30-40
MB/sec with even just 2-3 streams running on a single consumer hard
drive. More streams (concurrent backup jobs) will reduce throughput
further. This isn't FUD, this is REALITY.
If you want to keep a modern tape drive writing at its full speed you
need a disk subsystem that is fast enough to supply that tape drive. If
you want to run multiple backup jobs to your spool device while writing
to tape at the same time you need a decently fast disk subsystem that
can keep up. When designing a backup system you need to keep these
things in mind.
Bryn
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- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, (continued)
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Bryn Hughes
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Dimitri Maziuk
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Luc Van der Veken
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Bryn Hughes
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Dimitri Maziuk
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?,
Bryn Hughes <=
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Dimitri Maziuk
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Bryn Hughes
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Dimitri Maziuk
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Cejka Rudolf
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Dimitri Maziuk
- Re: [Bacula-users] Is Bacula and a LTO drive right for me?, Cejka Rudolf
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