[Samba] ODP: Primary DC migration / upgrade

Ingo Asche foren at asche-rz.de
Wed Dec 8 19:50:09 UTC 2021

What also may be an interesting solution:
I have moved the root partitions of my Raspi DCs to an iSCSI LUN on my 
Synology NAS.

For my Raspi 4 I get the following values from hdparm:
hdparm -tT --direct /dev/sda
  Timing O_DIRECT cached reads:   210 MB in  2.02 seconds = 104.19 MB/sec
  Timing O_DIRECT disk reads: 268 MB in  3.01 seconds =  88.99 


Rowland Penny via samba schrieb am 08.12.2021 um 16:32:
> On Wed, 2021-12-08 at 15:25 +0100, Norbert Hanke via samba wrote:
>> Hi,
>> I/O on the Rapberry Pi is as bad or good as the SD card used for
>> storage. Look here for useful benchmarks:
>> https://pibenchmarks.com/fastsd/ .
>> With the RPi 3 you can expect approx. 8 MB/s random read and 4 MB/s
>> random write with SanDisk SD cards; with the RPi 4 it's around 11
>> MB/s
>> random read and 5 MB/s random write with Kingston SD cards.
>> That's "terrible" compared to a contemporary SSD but for a Domain
>> Controller with no too many users it works fine.
>> You can speed up the RPi 4 by having an SSD on its USB 3 port...
>> makes
>> it 10 times as fast, you could even boot from it but the latter is
>> sometimes tricky to make it work.
> Which is why I use an ssd on one of my rpi DC's and spinning rust on
> the other. Setting up the ssd is a bit like setting up a Unix domain
> member, it is easy when you get the hang of it :-)
> Rowland

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