samba - Dec 2021 - ODP: Primary DC migration / upgrade

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

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
/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 
MB/secRegards

Ingo
https://github.com/WAdama

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
>
>
>

Compaired to that Pi .. 

And I forgot how old my server is, but its over 10 years old at least. 
Asrock mainboard, AMD Onboard dualcore CPU E350 Max 1600MHz, 
*(mostly running on 800MHz) 8GB ram (ddr3) , 1x SSD + 2x 3TB disks in mirror. 
And SQL on SSD, data to mirrored disks.

hddtemp /dev/sda
/dev/sda: OCZ-VERTEX3: 128?C  << wrong temp, ignore 

hdparm -tT --direct /dev/sda

/dev/sda:
 Timing O_DIRECT cached reads:   846 MB in  2.00 seconds = 422.58 MB/sec
 Timing O_DIRECT disk reads: 1114 MB in  3.01 seconds = 370.57 MB/sec 

hdparm -tT --direct /dev/sdb

/dev/sdb:
 Timing O_DIRECT cached reads:   866 MB in  2.00 seconds = 433.14 MB/sec
 Timing O_DIRECT disk reads: 196 MB in  3.06 seconds =  64.07 MB/sec

/dev/md10:
 Timing O_DIRECT cached reads:   850 MB in  2.00 seconds = 424.79 MB/sec
 HDIO_DRIVE_CMD(identify) failed: Inappropriate ioctl for device
 Timing O_DIRECT disk reads: 292 MB in  3.01 seconds =  96.90 MB/sec

To give an idea. 
Pi4 is nice but i personaly preffer the mini pc's or industreal pc's. 


Greetz, 

Louis

> -----Oorspronkelijk bericht-----
> Van: samba [mailto:samba-bounces at lists.samba.org] Namens Ingo 
> Asche via samba
> Verzonden: woensdag 8 december 2021 20:50
> Aan: samba at lists.samba.org
> Onderwerp: Re: [Samba] ODP: Primary DC migration / upgrade
> 
> 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
> /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 
> MB/secRegards
> 
> Ingo
> https://github.com/WAdama
> 
> 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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