Veritas-bu

Re: [Veritas-bu] STK T10000 tape drive

2007-09-13 10:56:26
Subject: Re: [Veritas-bu] STK T10000 tape drive
From: Justin Piszcz <jpiszcz AT lucidpixels DOT com>
To: Gregory Demilde <gdemilde AT gmail DOT com>
Date: Thu, 13 Sep 2007 10:43:29 -0400 (EDT)

On Thu, 13 Sep 2007, Gregory Demilde wrote:

> Native drive speed of the T10K is 120 MB/s ... it is even closer to
> 130 MB/s..; so If you are using compression and you feed the data fast
> enough you can go over the 170 MB/s.. I had peaks over the 180 MB/s
>
>
>
> On 9/13/07, Justin Piszcz <jpiszcz AT lucidpixels DOT com> wrote:
>>
>>
>> On Thu, 13 Sep 2007, Schaefer, Harry wrote:
>>
>>> FWIW, I have done write tests with ours and based on output from iostat
>>> -xtc, the write speeds were between 100-105 mb/sec...
>>>
>>> Harry
>>
>> But that is just the read speed of the hard drives yeah?  If the data
>> stream is compressed 2:1 the tape only writes then at 50-52.5 MiB/s.
>>
>> I recall watching catalog backups write to tape and I would see the disk
>> reading at 100-120 MiB/s, was the LTO-2 tape that is was backing the
>> catalog up to writing that fast?  No, compression was being used.
>>
>> Justin.
>>
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>
>
> -- 
> Gregory DEMILDE
> Email : gdemilde AT gmail DOT com
> GSM : +352 691 915620
>

I was referring to LTO-X but nice info!

Justin.
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