Re: Low write speed

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Thank  Wido den Hollander!

Migrate journaling to /dev/sdc1
and
rados bench -p my_pool 300 write

Total time run:         300.356865
Total writes made:      7902
Write size:             4194304
Bandwidth (MB/sec):     105.235 
Press any key to continue...


22.01.2014, 13:08, "Никитенко Виталий" <v1t83@xxxxxxxxx>:
> Hi, Wido den Hollander
>
>>>  Good day! Please help me solve the problem. There are the following scheme :
>>>  Server ESXi with 1Gb NICs. it has local store store2Tb and two isci storage connected to the second server .
>>>  The second server supermicro: two 1TB hdd (lsi 9261-8i with battery), 8 CPU cores, 32 GB RAM and 2 1Gb NICs . On /dev/sda installed ubuntu 12 and ceph-emperor. /dev/sdb disk placed under osd.0.
>> How do you do journaling?
>
> When i create osd i see:
> NFO:ceph-disk:Will colocate journal with data on /dev/sdb
>
>> Have you tried TGT instead?
>
> I tried tgt (with --bstype rbd) and result same.
>
>> Have you also tried to run a rados benchmark? (rados bench)
>
> rados bench -p my_pool 300 write
>
> Total time run:         30.821284
> Total writes made:      371
> Write size:             4194304
> Bandwidth (MB/sec):     48.149
>
> Stddev Bandwidth:       38.1729
> Max bandwidth (MB/sec): 116
> Min bandwidth (MB/sec): 0
> Average Latency:        1.31857
> Stddev Latency:         1.6014
> Max latency:            9.2685
> Min latency:            0.013897
>
>> Also, be aware that Ceph excels in it's parallel performance. You
>> shouldn't look at the performance of a single "LUN" or RBD image that
>> much, it's much more interesting to see the aggegrated performance of 10
>> or maybe 100 "LUNs" together.
>
> I dont understand how do it. I must create 10 LUN and 10 iscsi storage on esxi, and then test migrate 10 VM from local store to iscsi storage?
>
> Thanks! Vitaliy
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com





[Index of Archives]     [Information on CEPH]     [Linux Filesystem Development]     [Ceph Development]     [Ceph Large]     [Ceph Dev]     [Linux USB Development]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [xfs]


  Powered by Linux