Thanks,
this is very interesting.
My LTO2 drives (I have many installed) are from Certance.
Do you achieve these rates on a SunFire 280R? What is your scsi card?
I usually never achieve more than 8-10MB/s.......how can it be?!
----------------------------------------------------------------------------------
Da: Alan Brown <[EMAIL PROTECTED]>
A: Gabriele Bulfon <[EMAIL PROTECTED]>
Cc: bacula-users@lists.sourceforge.net
Data: 15 luglio 2006 19.44.26 CEST
Oggetto: Re: [Bacula-users] Slow backup on Sparc SunFire 280R
this is very interesting.
My LTO2 drives (I have many installed) are from Certance.
Do you achieve these rates on a SunFire 280R? What is your scsi card?
I usually never achieve more than 8-10MB/s.......how can it be?!
|
|
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Gabriele Bulfon - Sonicle S.r.l. Tel +39 028246016 Int. 30 - Fax +39 028243880 Via Felice Cavallotti 16 - 20089, Rozzano - Milano - ITALY http://www.sonicle.com |
----------------------------------------------------------------------------------
Da: Alan Brown <[EMAIL PROTECTED]>
A: Gabriele Bulfon <[EMAIL PROTECTED]>
Cc: bacula-users@lists.sourceforge.net
Data: 15 luglio 2006 19.44.26 CEST
Oggetto: Re: [Bacula-users] Slow backup on Sparc SunFire 280R
On Fri, 14 Jul 2006, Gabriele Bulfon wrote:
> Hello,
> I have some bacula installations on SunFire 280R Sparc machines, with Solaris 10.
> These machines apperar to be very very slow with respect to other installations (such as v20z) with same LTO2 device.
> As you can see from the report, 60Gb are copied in 9 hours, with an avarage rate of
> 1898.9 KB/s
> !
> On a v20z, the same amount of data is done in 5 hours or less, with
> an avarage
> a rate of
> 3139.2 KB/s.
Both of these rates are _very_ slow.
I benchmarked my LTO2 drives at 27-28MB/s last week using btape.
Marketing claims are for 60MB/s on 2:1 compressible data, but I believe
btape's fill algorithm produces non-compressable.
Even when spooling to disk and then dumping to tape, I still see rates of
around 10-12Mb/s.
Making up for that halving of speed, I am able to run concurrent backups,
so the tape drives are more-or-less spinning all the time as various
drives dump spooled data.
AB
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