>
> I am also interested in this.
>
> I have pretty big full backup (3,2TB) for which I need around 12 LTO-2 tapes
> (with hw compression on). I use spooling with max size of 215GB, and
> typically spooling (of max size) lasts 2h50min, while despooling lasts
> 2h40min. Is this normal that spooli
On Wed, 31 Oct 2007, Alan Brown wrote:
> I have 4 tape drives and allow up to 3 parallel operations per drive.
That should be _2_ tape drives.
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Still grepping through log file
On Wed, 31 Oct 2007, Ralf Gross wrote:
> I did some tiobenchmarks, but I'm not spooling more than one job at
> the same time. The RAID is capable of ~140 MB/s (seq. writes).
This is slightly lower than what I'm seeing with 4 3Gb/s 10,000RPM SATA
drives.
> But spooling is not my problem (I didn'
Alan Brown schrieb:
> On Wed, 31 Oct 2007, Ralf Gross wrote:
>
> >> I have pretty big full backup (3,2TB) for which I need around 12 LTO-2
> >> tapes
> >> (with hw compression on). I use spooling with max size of 215GB, and
> >> typically spooling (of max size) lasts 2h50min, while despooling las
On Wed, 31 Oct 2007, Ralf Gross wrote:
>> I have pretty big full backup (3,2TB) for which I need around 12 LTO-2 tapes
>> (with hw compression on). I use spooling with max size of 215GB, and
>> typically spooling (of max size) lasts 2h50min, while despooling lasts
>> 2h40min. Is this normal that s
Sandi S schrieb:
>
> > It seems that the job with spooling enabled can feed the drive at a
> > higher speed, but in the the end both jobs had an average write speed
> > of 75 MB/s (no spooling) and 77 MB/s (spooling) The compression ratio
> > of this backup was ~1.45:1. The spool device is a large
> It seems that the job with spooling enabled can feed the drive at a
> higher speed, but in the the end both jobs had an average write speed
> of 75 MB/s (no spooling) and 77 MB/s (spooling) The compression ratio
> of this backup was ~1.45:1. The spool device is a large RAID5 which is
> able to
Dan Langille schrieb:
> On 6 Oct 2007 at 10:41, Ralf Gross wrote:
>
> > How can I get information about how often a tape drive started/stopped
> > writing to tape? Is there a way to monitor the throughput of the SCSI
> > interface to the drive?
>
> On FreeBSD, I'd tell you to look at iostat. Out
Ralf Gross schrieb:
> > > How can I get information about how often a tape drive started/stopped
> > > writing to tape? Is there a way to monitor the throughput of the SCSI
> > > interface to the drive?
> >
> > On FreeBSD, I'd tell you to look at iostat. Output looks something
> > like this:
> >
Dan Langille schrieb:
> On 6 Oct 2007 at 10:41, Ralf Gross wrote:
>
> > How can I get information about how often a tape drive started/stopped
> > writing to tape? Is there a way to monitor the throughput of the SCSI
> > interface to the drive?
>
> On FreeBSD, I'd tell you to look at iostat. Out
On 6 Oct 2007 at 10:41, Ralf Gross wrote:
> How can I get information about how often a tape drive started/stopped
> writing to tape? Is there a way to monitor the throughput of the SCSI
> interface to the drive?
On FreeBSD, I'd tell you to look at iostat. Output looks something
like this:
$ i
Hi,
is there a way to see if a tape/drive is shoe-shining? I've backup
jobs that will run for several days, with spooling it will take even
longer.
I tried to backup with and without spooling, both jobs wrote with
~75 MB/s to the tape. But I can't say if there were short periods of
time where the
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