Very low perf (vs vtl)
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Fabien Rouach
Mar 14, 2018, 5:27:23 AM3/14/18
to QUADStor Storage Virtualization
Hi
I've bee doing several test on quadstor vtl, and had nice perf (close to 100MB/s sometimes)
decided to switch to disk backup using quadstor storage, and perf are very low on same hardware (only a couple of MB/s)
using HP servers
DL380 g6 / smart array p410
DL380 g8 / smart P420 or P822
sata drives (12x 4TB 5900rpm or 22x 1TB 7200rpm) raid 5 or 6
all accesses or done through 4Gb/s FC
once switches to quadstor storage, i can see on the quadstor system in iostat that disk at 100% almost all the time, with between 500KB and sometime up to 7-8MB transfer (but more rare)
could it be something related with block size the storage is writing, compared to VTL to make the RAID controler saturating or something likt that?
QUADStor Support
Mar 14, 2018, 7:40:50 AM3/14/18
to quadstor-virt
Please send the diagnostics file.
Also a btrace output
btrace -w 120 <device> > /tmp/btrace.out
Where <device> will be the device path of the RAID device configured
in the storage pool. If there are multiple devices please run btrace
against all devices configured in the pool. Also btrace needs to be
run during the backup when its slow.
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Also a btrace output
btrace -w 120 <device> > /tmp/btrace.out
Where <device> will be the device path of the RAID device configured
in the storage pool. If there are multiple devices please run btrace
against all devices configured in the pool. Also btrace needs to be
run during the backup when its slow.
> You received this message because you are subscribed to the Google Groups
> "QUADStor Storage Virtualization" group.
> To unsubscribe from this group and stop receiving emails from it, send an
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Fabien Rouach
Mar 14, 2018, 2:38:45 PM3/14/18
to QUADStor Storage Virtualization
I don't have btrace on my centos 7 server, what should I install?
is blktrace doing the same thing?
QUADStor Support
Mar 16, 2018, 12:18:25 PM3/16/18
to quadstor-virt
Please send the logs to sup...@quadstor.com
On Thu, Mar 15, 2018 at 12:18 AM, QUADStor Support <sup...@quadstor.com> wrote:
> btrace is installed by the blktrace package. Its a script which runs
> blktrace and passes the output to blkparse.
>
> yum install -y blktrace
>
> Then btrace should be in /bin/ and in /usr/bin
On Thu, Mar 15, 2018 at 12:18 AM, QUADStor Support <sup...@quadstor.com> wrote:
> btrace is installed by the blktrace package. Its a script which runs
> blktrace and passes the output to blkparse.
>
> yum install -y blktrace
>
> Then btrace should be in /bin/ and in /usr/bin
QUADStor Support
Mar 16, 2018, 12:18:25 PM3/16/18
to quadstor-virt
btrace is installed by the blktrace package. Its a script which runs
blktrace and passes the output to blkparse.
yum install -y blktrace
Then btrace should be in /bin/ and in /usr/bin
blktrace and passes the output to blkparse.
yum install -y blktrace
Then btrace should be in /bin/ and in /usr/bin
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