4
votes
1answer
206 views

iSCSI TGTD over InfiniBand Performance

I have just configured a server-to-server 4x SDR InfiniBand link to increase bandwidth for the backend storage of my virtual machines, specifically a database server. I am using iSCSI with TGTD on ...
1
vote
0answers
252 views

windows2012 failover cluster + storage. Considerations

We plan to build a failover storage with Windows2012r2. There will be 2 or 3 physical machines with 2 virtual machines on each server. One virtual machine building a failover, second one being storage ...
4
votes
1answer
166 views

SAN Performance Slow

I have an iSCSI HP P2000 loaded with 12 x 300gb DP SAS drives. This is connected to 2 DL385 servers with 64gb RAM running XenServer. The SAN network is multipathed via 2 gigabit switches (4 x copper ...
1
vote
1answer
288 views

iSCSI write cache

Is there a way to setup on a Linux iSCSI initiator a local disk partition for write cache ? The data would be first written on some high performance local disk and then in a second time on capacitive ...
4
votes
3answers
2k views

Jumbo Frames, ISCSI and ESXi

I have enabled Jumbo Frames (9000) in ESXi for all my vmNICs, vmKernels, vSwitches, iSCSI Bindings etc - basically anywhere in ESXi where it has an MTU settings I have put 9000 in it. The ports on the ...
4
votes
4answers
18k views

Disk IO slow on ESXi, even slower on a VM (freeNAS + iSCSI)

I have a server with ESXi 5 and iSCSI attached network storage. The storage server has 4x1Tb SATA II disks in Raid-Z on freenas 8.0.4. Those two machines are connected to each other with Gigabit ...
3
votes
1answer
155 views

Is WinSAT reliable to test the speed of my iSCSI, Fibre SAN, under bare metal or Virtualized?

I discovered the following command in this whitepaper: WinSat disk -read -ran -ransize 4096 -drive c Is it reliable to use against a SAN, or iSCSI drive? I would like to compare the output of ...
7
votes
2answers
2k views

Troubleshooting strategy for very poor iSCSI/NFS performance

We have a new Synology RS3412RPxs that offers iSCSI targets to three Windows 2008 R2 boxes and NFS to one OpenBSD 5.0 box. Logging into the RS3412 with ssh and reading/writing both small files and ...
5
votes
1answer
708 views

Dedicated NIC or dedicated port for iSCSI?

When spec'ing and configuring a machine that will utilise shared iSCSI storage, I've read a lot of documentation which suggests a dedicated network adapter should be used for iSCSI communication. That ...
4
votes
1answer
682 views

Dual Controller SAN 8x1GBE or 4x10GBE Performance

I'm looking at getting 3 hosts and a SAN set up with iSCSI for a VMware envoroment and have had several companies come to us with suggestions (small team and will need help with implementation). They ...
1
vote
1answer
448 views

Poor MD3000i read performance (for one controller, but not the other)

We have an MD3000i array accessed by three separate servers (all blade servers accessing through chassis nic's). Controller 1 (both Ports 0 and 1) are linked to Server A. Servers B and C (both with ...
1
vote
1answer
613 views

Using a NAS to store user files over iSCSI/NFS?

I have an environment with servers (5-6) virtualized and hosted locally on the hypervisor. They act as file servers, so am thinking of moving the files out to a NAS (TheCUS or QNAP) and share over ...
1
vote
2answers
971 views

Expected IOPS for log writing on PS6000X SAN?

Customer is experiencing poor Sybase ASE 15 performance on a PS6000X SAN with 16 X 450GB 10K in RAID-50. The server is a Dell R710 running 2003 server R2 64bit in ESX 4.0.0,256968 I've used sqlio to ...
2
votes
4answers
6k views

5400 RPM vs. 7200 RPM 2.5" Drives in RAID - Any Real Difference?

Suppose you setup 8 drives in a RAID 10 configuration using 2.5" drives using 500GB capacity each (total 2TB with RAID10 config 1TB useable). The controller (assume a typical 3ware SATA controller) ...
0
votes
3answers
262 views

What utilities do you use and how do you use them when benchmarking your harddrive subsystem for a SAN replacement?

So, I have a series of questions into ServerFault about LeftHand SAN's (Questions 1441 and 4478). One of the responses I received questioned the throughput of the iSCSI data returning from the SAN ...