On Tue, Jun 4, 2019 at 1:39 PM wrote:
> >> Basically they max out at around 1000 IOPS and report 100%
> >> utilization and feel slow.
> >>
> >> Haven't seen the 5200 yet.
>
> Micron 5100s performs wonderfully!
>
> You have to just turn its write cache off:
>
> hdparm -W 0 /dev/sdX
>
> 1000 IOPS m
Basically they max out at around 1000 IOPS and report 100%
utilization and feel slow.
Haven't seen the 5200 yet.
Micron 5100s performs wonderfully!
You have to just turn its write cache off:
hdparm -W 0 /dev/sdX
1000 IOPS means you haven't done it. Although even with write cache
enabled I o
Is there any other evidence of this?
I have 20 5100 MAX (MTFDDAK1T9TCC) and have not experienced any real issues
with them.
I would pick my Samsung SM863a's or any of my Intel's over the Micron's, but I
haven't seen the Micron's cause any issues for me.
For what its worth, they are all FW D0MU02
On Wed, May 29, 2019 at 11:37 AM Robert Sander
wrote:
> Hi,
>
> Am 29.05.19 um 11:19 schrieb Martin Verges:
> >
> > We have identified the performance settings in the BIOS as a major
> > factor
> >
> > could you share your insights what options you changed to increase
> > performance and
On Wed, May 29, 2019 at 9:36 AM Robert Sander
wrote:
> Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> > * SSD model? Lots of cheap SSDs simply can't handle more than that
>
> The customer currently has 12 Micron 5100 1,92TB (Micron_5100_MTFDDAK1)
> SSDs and will get a batch of Micron 5200 in the n
Hi,
Am 29.05.19 um 11:19 schrieb Martin Verges:
>
> We have identified the performance settings in the BIOS as a major
> factor
>
> could you share your insights what options you changed to increase
> performance and could you provide numbers to it?
Most default perfomance settings nowa
It would be interesting to learn the improvements types and the BIOS changes
that helped you.
Thanks
> From: "Martin Verges"
> To: "Robert Sander"
> Cc: "ceph-users"
> Sent: Wednesday, 29 May, 2019 10:19:09
> Subject: Re: [ceph-users] performan
Hello Robert,
We have identified the performance settings in the BIOS as a major factor
>
could you share your insights what options you changed to increase
performance and could you provide numbers to it?
Many thanks in advance
--
Martin Verges
Managing director
Mobile: +49 174 9335695
E-Mail
Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> * SSD model? Lots of cheap SSDs simply can't handle more than that
The customer currently has 12 Micron 5100 1,92TB (Micron_5100_MTFDDAK1)
SSDs and will get a batch of Micron 5200 in the next days
We have identified the performance settings in the BIO
Quoting Robert Sander (r.san...@heinlein-support.de):
> Hi,
>
> we have a small cluster at a customer's site with three nodes and 4 SSD-OSDs
> each.
> Connected with 10G the system is supposed to perform well.
>
> rados bench shows ~450MB/s write and ~950MB/s read speeds with 4MB objects
> but on
+--+--+
-Original Message-
From: Robert Sander [mailto:r.san...@heinlein-support.de]
Sent: vrijdag 24 mei 2019 15:26
To: ceph-users
Subject: Re: [ceph-users] performance in a small cluster
Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> 20 MB/s at 4K blocks is ~5000 i
Hello Robert,
probably the following tool provides deeper insights whats happening on your
osds:
https://github.com/scoopex/ceph/blob/master/src/tools/histogram_dump.py
https://github.com/ceph/ceph/pull/28244
https://user-images.githubusercontent.com/288876/58368661-410afa00-7ef0-11e9-9aca-b09d9
Hi Robert
1) Can you specify how many threads were used in the 4k write rados test
? i suspect that only 16 threads were used, this is because it is the
default + also the average latency was 2.9 ms giving average of 344 iops
per thread, your average iops were 5512 divide this by 344 we get 16
On Sat, May 25, 2019 at 12:30 AM Mark Lehrer wrote:
> > but only 20MB/s write and 95MB/s read with 4KB objects.
>
> There is copy-on-write overhead for each block, so 4K performance is
> going to be limited no matter what.
>
no snapshots are involved and he's using rados bench which operates on
> but only 20MB/s write and 95MB/s read with 4KB objects.
There is copy-on-write overhead for each block, so 4K performance is
going to be limited no matter what.
However, if your system is like mine the main problem you will run
into is that Ceph was designed for spinning disks. Therefore, its
On Fri, May 24, 2019 at 3:27 PM Robert Sander
wrote:
> Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> > 20 MB/s at 4K blocks is ~5000 iops, that's 1250 IOPS per SSD (assuming
> > replica 3).
> >
> > What we usually check in scenarios like these:
> >
> > * SSD model? Lots of cheap SSDs simply can't
On Fri, May 24, 2019 at 6:26 AM Robert Sander
wrote:
> Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> > 20 MB/s at 4K blocks is ~5000 iops, that's 1250 IOPS per SSD (assuming
> > replica 3).
> >
> > What we usually check in scenarios like these:
> >
> > * SSD model? Lots of cheap SSDs simply can't
Am 24.05.19 um 14:43 schrieb Paul Emmerich:
> 20 MB/s at 4K blocks is ~5000 iops, that's 1250 IOPS per SSD (assuming
> replica 3).
>
> What we usually check in scenarios like these:
>
> * SSD model? Lots of cheap SSDs simply can't handle more than that
The system has been newly created and is no
20 MB/s at 4K blocks is ~5000 iops, that's 1250 IOPS per SSD (assuming
replica 3).
What we usually check in scenarios like these:
* SSD model? Lots of cheap SSDs simply can't handle more than that
* Get some proper statistics such as OSD latencies, disk IO utilization,
etc. A benchmark without de
Hi,
we have a small cluster at a customer's site with three nodes and 4
SSD-OSDs each.
Connected with 10G the system is supposed to perform well.
rados bench shows ~450MB/s write and ~950MB/s read speeds with 4MB
objects but only 20MB/s write and 95MB/s read with 4KB objects.
This is a litt
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