Bacula-users

Re: [Bacula-users] Faster reading of Volumes from disk

2016-02-18 11:17:28
Subject: Re: [Bacula-users] Faster reading of Volumes from disk
From: Dan Langille <dan AT langille DOT org>
To: Cejka Rudolf <cejkar AT fit.vutbr DOT cz>
Date: Thu, 18 Feb 2016 11:15:04 -0500
On Feb 18, 2016, at 6:59 AM, Cejka Rudolf <cejkar AT fit.vutbr DOT cz> wrote:

Dan Langille wrote (2016/02/17):
Writing 334GB to tape takes about 13 minutes.

Hello,
 it means about 334*1024/(13*60) = 438.48 MB/s. Do you really have
so fast tape write?

It's LTO-4 which should do 120MB/s (https://en.wikipedia.org/wiki/Linear_Tape-Open).

Let's look at it again:

15-Feb 22:59 tape01-sd JobId 231188: Committing spooled data to Volume "000003L4". Despooling 333,554,921,501 bytes ...
16-Feb 00:12 tape01-sd JobId 231188: Despooling elapsed time = 01:13:23, Transfer rate = 75.75 M Bytes/second
16-Feb 00:12 tape01-sd JobId 231188: Elapsed time=10:48:58, Transfer rate=8.557 M Bytes/second
16-Feb 00:12 tape01-sd JobId 231188: Sending spooled attrs to the Director. Despooling 422,031,119 bytes ...

I missed an hour.  It was 1 hour and 13 minutes or about 78MB/s 

Thank you.

-- 
Dan Langille - BSDCan / PGCon




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