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тАО03-24-2009 02:09 PM
тАО03-24-2009 02:09 PM
we got quite a strange issue with a dual controller MSA2012i. Basically the read speed is crawling slow (about 1-3 MB/sec) while writing data yields good results (about 40-100+ MB/sec depending on filesize). This behavior is the same on all vdisks/volumes and from any of the three connected servers.
Vdisk Configuration is: one Vdisk per Controller (4x450GB@Raid5 and 3x450GB@Raid5 + global Hotspare) and two volumes on the big and one volume on the smaller vdisk, each volume is in access by one server. All Drives are SAS-Drives. All connected Servers are Windows 2003 Machines accessing with MS iSCSI-Initiator (v2.08).
The Configuration is like the recommended Setup from the Manual, that is both Port0s in a subnet and both Port1s in a Subnet, both connected via separate (Layer2) switches to the servers which also have 1 Port in each Subnet. These switches only serve iSCSI-Traffic. All four Controller Ports are connected in MS iSCSI-Initiator (2.08) and MPIO is set up with RoundRobin Policy for each connected volume (confirmed working with troughput-measuring). We also installed the MSA2000 VSS/VDS/Capi Packages along with the three recommenced Hotfixes on each server.
Each NICs with iSCSI-Access on all servers is configured with:
Jumbo-Frames @ 9k
TCP Offload Engine enabled
TCP AckFrequency set to 1 like mentioned in the Guide
LinkDownTime set like in the Guide
Set to fixed 1Gbit Link Speed
Host Ports on the MSA2012i are also set for Jumbo-Frames and 1Gbit Link Speed.
Patched latest Firmware JP210P12 .. (which was quite troublesome from JP210P03 but worked in the end). Write-Back cache is enabled and Disk-Drive Read Cache enabled on all drives.
We got not a single CRC/Transmission Error on any of the iSCSI-Network connections.
Tried Read-Ahead-Cache with Default, 4 MB and Maximum Setting .. no difference.
Basically it is just the low read speed from the MSA2012i which causes trouble.
Has anybody seen a similar issue .. or better: any ideas ?
Solved! Go to Solution.
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тАО03-28-2009 04:14 PM
тАО03-28-2009 04:14 PM
SolutionI also upgraded both controllers firmware to the latest 16 March JP210P12...but I had to disable firmware communication between the controllers, on system configuration. Before I did that, the controller with the older firmware would overwrite it on the newest controller firmware! I patched it on both controllers, one at a time. This firmware fixes a bunch of problems, I would highly recommend it.
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тАО03-29-2009 12:59 AM
тАО03-29-2009 12:59 AM
Re: MSA 2012i DC : slow read (but good write speed)
I just tried it this morning and it DID solve the weak read rate. Stange, as all components (MSA, Switches and NICs) are said to support 9k-Jumboframes. We also tried other switches now (1800-8G .. which are also used in the MSA200i-Starter-Bundle) .. was no differece.
As soon as Backup is complete, I'll just have to switch MPIO back on (had it off for debugging) and everything should be ok.
Well I guess I'll just keep Standard-MTU in the future.
I will report back after completion.
P.S.
tbh .. these 1800-8G are a bit of a joke .. no rackmount possible and external powersupply .. and the next size is 1800-24G priced at about ut 5x the price .. no comment.
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тАО03-29-2009 11:34 PM
тАО03-29-2009 11:34 PM
Re: MSA 2012i DC : slow read (but good write speed)
Now I don't get the same write rates for sequentiel writes (before: more than 100 MB/s, not about 55MB/s .. both times with MPIO) but that is something for research in the future.
I nog get about ~60MB/s with one thread over one or two pathes. If I use multiple Threads it goes to 100MB/s+ . so thats "normal" I suppose.
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тАО04-02-2009 06:02 AM
тАО04-02-2009 06:02 AM
Re: MSA 2012i DC : slow read (but good write speed)
I found out yesterday a very weird problem this week. I cannot do Microsoft Shadow copies on a MSA2000i volume on my Windows Server 2003 R1 SP2...?! I dont know why, I have tried everything. I just receive this error in system log:
Event Type: Error
Event Source: VolSnap
Event Category: None
Event ID: 28
The shadow copy of volume L: could not be created due to a failure in creating the necessary on disk structures.
and a message with something about "not enough space on the volume". The 1.5 Tb volume is almost empty! this does not happen on other (not iscsi) volumes. I uninstalled MSA 2000 VSA provider, did not work. I dont know what else to do.
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тАО06-15-2009 03:54 AM
тАО06-15-2009 03:54 AM
Re: MSA 2012i DC : slow read (but good write speed)
My config is only one controller, both ports are in same subnet, iscsi traffic had own Vlan, switch is blade cisco 3520. MSA is connected to two hyper-v boxes both with two physical nic. In the eventlog I achieve error log Iscsiprt eventid 20 and 7 check attachment.
Should be controller ports in different subnet or can be in the same, if I have only single controller?
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тАО07-22-2009 06:19 PM
тАО07-22-2009 06:19 PM
Re: MSA 2012i DC : slow read (but good write speed)
I see lots of other posts complaining about "only 110 MB/s" or even 40-50... I would be thrilled with that.
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тАО07-22-2009 11:16 PM
тАО07-22-2009 11:16 PM
Re: MSA 2012i DC : slow read (but good write speed)
Do you get these Values per Thread or at all and only Read/Write or both.