On Fri, Jul 23, 2021 at 10:45:49AM +0200, Stefan G. Weichinger wrote:
> Am 22.07.21 um 13:54 schrieb Stefan G. Weichinger:
>
> > I defined this in amanda.conf
> >
> > define interface chelsio {
> >
> > comment "10G NIC"
> >
> > use 10 Gbps
> >
> > }
>
> More tuning ahead, not yet verified (= waiting for the next amdump):
>
>
> inparallel 6
> dumporder "BTBTBT"
> netusage 10 Gbps
> device-output-buffer-size 2048k # LTO6 drive
How many clients do you have?
>
> In
>
> "define application-tool app_amgtar"
>
> property "TAR-BLOCKSIZE" "1024"
>
> Quick tests show that this improves the creation of the "tar-stream" on the
> client.
>
> Restore test: todo. Sure.
>
> -
>
> What I can't yet explain:
>
> the holdingdisk (Samsung SSD 860 EVO 2TB)
>
> * it is attached to a MegaRAID SAS 2008 controller. The local admin created
> a RAID0 device on the controller, this gives us /dev/sdb in linux
>
> * one partition /dev/sdb1, XFS
>
> UUID=781a9caf-39f2-4e5a-b7cd-f2b320e06b74 /mnt/amhold xfs noatime 0 0
>
> * # cat /sys/block/sdb/queue/scheduler
>
> [none] mq-deadline
>
> I can write to it via dd with over 200 MB/s:
>
> root@backup:/mnt/amhold# dd if=/dev/zero of=/mnt/amhold/testfile bs=1G
> count=1 oflag=direct
>
> 1+0 Datensätze ein
>
> 1+0 Datensätze aus
>
> 1073741824 bytes (1,1 GB, 1,0 GiB) copied, 4,52339 s, 237 MB/s
>
> OK; slower with smaller blocks:
>
> root@backup:/mnt/amhold# dd if=/dev/zero of=/mnt/amhold/testfile bs=4M
> count=1000 oflag=direct
>
> 1000+0 Datensätze ein
>
> 1000+0 Datensätze aus
>
> 4194304000 bytes (4,2 GB, 3,9 GiB) copied, 23,2486 s, 180 MB/s
I was expecting much more from the SSD, but I can be thinking in
faster NVME.
Just for curiosity, what "hdparm -tT /dev/sdb" gives.
>
> -
>
> When I amdump a single DLE from another client, no compression, and watch
> with "atop", I see /dev/sdb1 at 100% "load" ... with around 130 MB/s max,
> decreasing write rate over time.
>
> The clients storage is able to deliver with around 300MB/s.
>
> And the NICs are 10G each.
>
> Where is the bottleneck? Or do I expect too much?
>
> The CPU cores are NOT fully loaded ...
>
On my setup I have more than 190 clients using auth=ssh with a NIC
of 10Gb/s.
On my amanda.conf for example:
inparallel 62
dumporder "TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTtt"
Kind regards
Jose M Calhariz
--
--
Não preciso de advogados para me dizer o que não devo fazer.
Eu os contrato para me dizer como fazer o que quero fazer.
-- J. Pierpont Morgan
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