Well, all I can do is confirm the 6000-7000KB/sec transfer
rate. I'm using Solaris 2.5.1 with an IBM LTO ultrium
(I'm still trying to get Amanda to work with the autoloader)
and I get the same performance you do. I have one holding
disk big enough to hold a dump of any other disk I'm trying
to back up.
Regards, Scott
On Wed, 17 Jan 2001, Gerhard den Hollander wrote:
> Date: Wed, 17 Jan 2001 11:55:31 +0100
> From: Gerhard den Hollander <[EMAIL PROTECTED]>
> Reply-To: Gerhard den Hollander <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED], [EMAIL PROTECTED]
> Subject: A question about performance
>
> Scenario:
>
> I have a machine with a bunch of 18G disks and one raid5 arrray of 420G [1]
>
> I have hooked up an LTO ultrium tapedrive to that machine
> (100G uncompressed, 30Mbit/s transfer rate (that's 10G per hour
> uncompressed))
> if I ufsdump [2] the raid array to that LTO drive, I get indeed almost 10G
> per hour.
>
> I was using amanda, with some space on that disk allocated as holding
> space. And I was getting arund 6-7000 kps Xfer rate.
>
> since all disks were local to my machine, I changed amanda.conf to have
> - only 1 dumper
> - not use any holding space
>
> The next amanda run took over 18 hours to complete (a Xfer rate of less
> than 1G per hour (350 - 400 kps)
>
> Now I switched it back to
> - multiple dumpers
> - use holding disk (accept for the RAID array itself)
> and it looks im getting 6 - 7000 kps again.
>
> Can anyone explain this to me ?
>
> I was expecting that since all disks are local disks, I would be getting
> roughly the same results in both setups.
>
> [1] raid 5 and 1 hotspare, disks hotswappable .. had one disk die in there,
> replaced it whitout having to shut down the machine or the diskpack ..
>
> [2] Yup, Im using solaris (2.6 and up )
>
> On a related note:
>
> I was trying to use gnutar iso ufsdump to backup the raidarray , so that I
> could use exclude files , and the tar estimate takes easily over an hour ,
> the ufsdump based estimates are done much sooner (30-ish minutes).
>
> Any clue ;)
>
> Kind regards,
> --
> Gerhard den Hollander Phone +31-10.280.1515
> Technical Support Jason Geosystems BV Fax +31-10.280.1511
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