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CX4-120 iscsi transfer rate
Using CX4-120 with FC15k disks (RAID DP). The CX4-120 is attached to network trough iSCSI. I would like to know what kind of read rate I could obtain from a server (windows) with iSCSI LUN mounted on CX4. Has anyone an experience ?
In advance tahnk you
kelleg
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February 11th, 2011 14:00
As this is a CX4, I'm assuming that you're using the 1GbE iSCSI connections. The theoretical bandwidth would be around 100MB/s.
This does not account for TCP overhead or network traffic and the number of hosts connected and the size of the IO or the balance of Reads vs Writes or the number of disks that a LUN is using or any number of other factors that will affect bandwidth.
There are some many variables that there really is no one number.
See the Best Practice guides listed below:
EMC CLARiiON Performance and Availability Release 30 Firmware Update Applied Best Practices.pdf
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/h5773-clariion-best-practices-performance-availability-wp.pdf
EMC CLARiiON Storage System Fundamentals for Performance and Availability
http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1049_emc_clariion_fibre_channel_storage_fundamentals_ldv.pdf
Please see KnowledgeBase article emc245445 on PowerLink (Solutions).
glen
colohost
43 Posts
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February 16th, 2011 08:00
I'm not sure if the CX4-120 supports 10gig, but if it does, I'm using 10gig iscsi with jumbo frames on a CX4-480 and with some careful tuning I've been able to achieve close to 300 MB/sec sustained writes, 580 MB/sec sustained reads and an average of 11700 random iops. This is on raid groups of 9+1 raid 5 and 16 kb pages, 1526 MB write cache, the rest read cache.
beblan
2 Posts
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February 18th, 2011 04:00
Le 18/02/2011 13:19, Ripshot a écrit :
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Ripshot
16 Posts
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February 18th, 2011 04:00
Just curious how you are running your tests. I am having some performance issues also on a CX4-120 iscsi.
colohost
43 Posts
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February 23rd, 2011 09:00
My test specs were:
Centos 5.5 x86_64 guest
vmware tools installed
testing disk partition formatted ext4 and mounted on a paravirtual scsi adaptor
1 GB of guest memory assigned
I ran the tests with Bonnie++ from http://www.coker.com.au/bonnie++/ with a test data set size of 16 GB to ensure it would be large enough to not let the entire test be cached in the CX4's cache.
kelleg
4.5K Posts
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February 23rd, 2011 09:00
Please remember to mark the question as Answered when you get the correct or best answer. Also, please award points to the person providing the best answer.
glen