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  • SAN performance issues storing SQL Server tempdb on a SAN that's being backed up

    - by user42724
    I'm afraid I don't know much about SAN's so please forgive my lack of detail or technical terms. As a developer I've just completed and put on an existing production system a new application but it would appear to have tipped the scales regarding the performance of the backups being taken from the SAN. As I understand it there's a mirror of the SAN being taken usually constantly at the block-level. However, there seem to be so many new writes to the disk that the SAN mirroring/backup process can no longer keep up. I believe I've narrowed this down to SQL Servers tempdb which exists on a drive that contributes the largest portion of the problem! In fact I think tempdb has be contributing the largest portion of the issues all along regardless of my application! My question therefore is whether the tempdb should ever be mirrored or backed on the SAN and whether anyone else has gone through this sort of pain already? I'm wondering whether it's a best practise to make sure that tempdb is never mirrored on a SAN simply because any writes to it don't need to be saved. This also raises a slightly connected question - is it better to rely on SQL Servers built-in database backups tools (DB in full-recovery mode with full/differential and transaction log backups) or, as is the case with our application, SQL server is in simple recovery mode and never backed up since the SAN is mirrored and backed up? Many thanks

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  • Connection lost to iscsi san after problem with san

    - by marceldejager
    Hi there, We have a cluster running with 3 VSpere ESX4 server that all are connected to a lefthand san through iSCSI. This all worked well but a week ago there was a problem with the san. After fixing that problem the VMWARE server continued working but this weekend I saw that 1 server didn't have a connection with the SAN. The other two work perfecly. I looked at all setting and I cannot find a problem. Nowhere I can't find any erros. Has anybode a idea? Thanks, Marcel

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  • Is the SAN dying???

    - by RickHeiges
    Is the SAN dying? The reason that I ask this question is that MSFT has unleashed technologies this year that point in that direction Always ON Availability Groups shuns shared storage Windows 2012 has Storage Replication Technology that does not require a SAN Windows 2012 has Hyper-V Replica Technology that does not require a SAN PDW v2 continues to reinforce the approach to avoid shared storage I'm not saying that SAN technology does not have its place or does not have benefits inherent to the beast....(read more)

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  • SAN with iSCSI-Target Performance Horrendous

    - by Justin
    We have a poor man's SAN setup in a 1U Ubuntu server running iSCSI-Target with two 300GB drives in RAID-0. We then are using it for block level storage for virtual machines. The hypervisor is connected to the SAN via gigabit on a dedicated VLAN and interfaces. We only have a single virtual machine setup and doing some benchmarks. If we run hdparm -t /dev/sda1 from the virtual machine, we get 'ok' performance of 75MB/s from the virtual machine to the SAN. Then we basically compile a package with ./configure and make. Things start ok, but then all the sudden the load average on the SAN grows to 7+ and things slow down to a crawl. When we SSH into the SAN and run top, sure the load is 7+, but the CPU usage is basically nothing, also the server has 1.5GB of memory available. When we kill the compile on the virtual machine, slowly the LOAD on the SAN goes back to sub 1 figures. What in the world is causing this? How can we diagnosis this further? Here are two screenshot from the SAN during high load. 1> Output of iotop on the SAN: 2> Output of top on the SAN:

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  • 2 Server FC SAN Configuration

    - by BSte
    I have 2 identical servers: -48GB Ram -8GigE NIC's -2FC NIC's -2x72GB RAID1 Hard Drives -Server 2008R2 Host I also Have a Fibre Channel SAN: -16x146GB RAID10 Hard Drives -2xDual-port FC Controllers (Controller A and B both have ports 1 and 2) -Server 1 has Fiber to Ports A1 and B1 -Server 2 has Fiber to Ports A2 and B2 -I kept the default config with 1 Virtual Disk and 1 Volume -The default mappings show ports A1,A2,B1,B2 on LUN 0 with read-write My goal is: -2xVM's with IIS and Guest Level Failover -2xVM's with SQL 2008 Enterprise using a Single DB and Guest Level Failover -1xVM that is an application server, preferable with Host Failover. From what I read, this will also need AD for clustering to work. -I need at least 1 VM always running for IIS and the SQLDB. This includes hardware failover and application (ie: reboot a VM for Critical updates) I was told I could install the VM's and run them from the SAN, and this is what I've tried: Installed MPIO and HyperV on Server1 and Server 2 Added the SAN as Disk E: on both servers, made it GPT and formatted NTFS Configured HyperV on both server to store use E:\VD and E:\VHD On server1, I was able to install 3 VM's on the SAN and all worked well. On server2, I would start installing the other 2 VM's, but always at some point the VM's would get a corrupt .VHD message (either server). Everything I found about the message typically related to antivirus, so I removed all antivirus on both Host servers (now only running 2008R2). I reformatted drive E: (SAN), recreated the VHD and VD directories, installed 3 VM's on Server 1, and then had the same issue when installing VM's on Server2. Obviously something is wrong, but I'm not certain what exactly. My questions: 1) Are my goals possible with this hardware setup? -I've read 2008R2 supports FC SAN's, but a lot of articles seem to only give examples with iSCSCI setups 2) What would be the suggested route on setting up the SAN (disks,volumes,LUN's)? I've worked with HyperV on a single machine before and never had issues. Actual experience working on SAN's and clustering is new to me. Any suggestions or recommendations to get me in the right direction would be much appreciated.

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  • How Is A SAN Storage Device Managed? [closed]

    - by slickboy
    Apologies if this is a stupid question but my only previous experience with SAN technology is using a SAN virtualisation tool (StarWind iSCSI SAN Free). This tool comes with a management interface that allows for iSCSI targets to be configured on the simulated SAN that can then be accessed. My question is basically: How is physical SAN device managed? Is an operating system required to be installed on the SAN device and then managed via software? Or can it be managed remotely via an application with no OS on the device? Thanks for any help.

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  • Lefthand SAN questions.

    - by Gk
    I'm curious about Lefthand SAN solutions from HP. People from Dell have told me that Lefthand SAN's require at least two nodes and data must be mirroring between them so capacity is a half less compare to other SAN technology (e.g.Equal Logic). Is it true? Can a HP lefhand SAN be used as a stand-alone storage server with full RAID function (1, 10, 5)? TIA, -giobuon

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  • Lefthand SAN quetions.

    - by Gk
    I'm curios about Lefthand SAN solution from HP. Ppl from Dell told me that lefthand SAN require at least two nodes and data must be mirroring between them so capacity is a half less compare to other SAN technology (e.g.Equal Logic). Is it true? Can a HP lefhand SAN can use as a stand-alone storage server with full RAID function (1, 10, 5)? TIA, -giobuon

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  • ZFS and SAN -- best practices?

    - by chris
    Most discussions of ZFS suggest that the hardware RAID be turned off and that ZFS should directly talk to the disks and manage the RAID on the host (instead of the RAID controller). This makes sense on a computer with 2-16 or even more local disks, but what about in an environment with a large SAN? For example, the enterprise I work for has what I would consider to be a modest sized SAN with 2 full racks of disks, which is something like 400 spindles. I've seen SAN shelves that are way more dense than ours, and SAN deployments way larger than ours. Do people expose 100 disks directly to big ZFS servers? 300 disks? 3000 disks? Do the SAN management tools facilitate automated management of this sort of thing?

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  • SAN typical MTBF

    - by Adrian K
    We're using a SAN on a project at work, and there's a bit of debate around the fact that's technically it's a Single Point of Failure. No one seems to have any hard data. The SAN in question is a single physical box, but with internal redundant components (sorry - not sure3 what level of RAID it has, but I can find out). What's the tyopical MTBF for a SAN? The PM has it down on the projects risk register as "Quite Common' - I've never heard of a SAN going down, but I don't jhave any stats to show how likely it really is. Does anyone have any helpful info?

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  • Win'08 - Extend volume size on SAN attached storage in a failover cluster

    - by user53207
    Running Win 2008, I'd like to extend the volume of a SAN attached drive that is part of a failover cluster. The SAN team has allocated additional drive space which is being seen by Windows Storage Manager. However, the option to "Extend Volume" is disabled, so is the ability to turn it into a dynamic disk. Is the ability to extend volumes when part of a failover cluster disabled or not available when it's part of SAN attached storage?

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  • Which protocol do clients use when communicating with servers in a SAN

    - by Mario De Schaepmeester
    I'm trying to wrap my head around how a SAN works and how it is implemented. If I understand this well, clients wanting to access the storage devices in a SAN need to communicate with the servers via the LAN. When the SAN is implemented with Fibre Channel, these servers are Fibre Channel compliant devices, and internally in the SAN they work with the Fibre Channel Protocol. Both data and communications are supported by Fibre Channel. But which application-layer protocol do the clients use in the LAN to communicate with the servers? Is the data simply transferred via ethernet as well? This is some part I am stuck on. I went trough a lot of sources but most sources don't really mention protocols and if they do, they only mention FCP.

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  • SAN alternative for VMWare

    - by CogitoErgoSum
    Has anyone utilized something aside from a SAN to run their VMWare images off? We are looking to drop in two HP Servers and VMWare on them and run them off a SAN. Due to the cost of SAN though our CFO and VP are wondering if there are any viable alternatives (I.e. NAS) that can effectively run a VMWare. I can't think of any off of the top of my head. IF anyone can provide one or a good article outlining why to stick to SAN that'd be great.

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  • ESX hosts lose connectivity with iSCSI SAN LUNs

    - by Themist
    I've been experiencing this issue for a couple of months now where my ESX hosts lose connectivity with my iSCSI SAN vmfs volumes. As a results the ESX hosts enter a nonresponsive mode the associated VMs disconnect and the only remedy is to reboot the host. This issue happens randomly . I have escalated this issue with VMWare but I haven't had any solution to the issue yet. I see no errors on my switches and there are no hardware issues as well. My SAN infrastucture is solid and there are 2 paths for every vmfs volume. Did anybody else experienced a similar issue? edit: Here are some more details: The iSCSI SAN software is Datacore Sanmelody 2.0.4.2 running on 2 HP Proliant G5 servers. The storage attached to each of the servers is an HP MSA70 and all the iSCSI SAN Volumes that are presented to my 4 ESX hosts are mirrored. I have two iSCSI swithces HP Procurve 1800G-24 that are trunked together. My SANLELODY servers are using NC360T NICs. I team two NICs and have one cable connecting to each iSCSi switch. Each ESX server uses two NICs as well for the iSCSI Network.

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  • Need help trying to diagnose Symmetrix SAN performance issues

    - by arcain
    I am helping to benchmark hardware for a new SQL Server instance, and the volume presented to the OS for the data files is carved from a set of spindles on a Symmetrix SAN. The server has yet to have SQL Server installed, so the only activity on the box is our benchmarking. Now, our storage engineers say that this volume and it's resources are dedicated to our new server (I don't have access to see the actual SAN config) however the performance benchmarks are troubling. For example, the numbers look good until suddenly, and randomly, we see in our IO benchmarking tool wait times of 100 seconds, and disk queue lengths of 255 in perfmon. This SAN has an 8 GB cache, plus there are other applications besides ours that use the SAN. I'm wondering if (even though the spindles for our volumes should be dedicated to us) the cache may be getting hammered during the performance testing, or perhaps the spindles our volumes are on aren't really dedicated to us. We're not getting much traction from our storage engineers in helping us track down the problem, so if anybody has experience with diagnosing a problem like this and would like to share insights and troubleshooting methodologies, I'd appreciate it.

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  • Why do you use a 3PAR SAN? [closed]

    - by Starfish
    If you use a 3PAR SAN, I’d like to hear what you think about it, particularly compared to the HP EVA. What do you see as its advantages over other SANs like the EVA? What’s so special about the ASIC? We had HP quote us an EVA P6500 and 3PAR V400 with equivalent storage and the 3PAR was nearly twice the cost. My site has two EVA SANs with a combined capacity of ~80 TB. We want to replace the older and larger of the two. We’ve been looking at the EVA and the 3PAR to see which would be a better fit for us. I’m struggling to understand how the 3PAR differs from the EVA from a practical technical standpoint. When I read the sales literature and speak with the HP sales engineers, they spend a lot of time talking about how the 3PAR is better because of its ASIC. It’s ASIC this and ASIC that, but when I press them on how a 3PAR with thin provisioning is better than an EVA with thin provisioning, I can’t get a straight answer. Meanwhile, one of my colleagues, who has more say regarding which SAN we get, is enamored by the 3PAR, and he can’t explain clearly to me why he wants it over the EVA. Our needs are pretty simple. We have 10 servers running VMware and ~100 VMs. We use VMware’s thin provisioning currently, but we would like to start using thin provisioning on the new SAN. We don’t have a need for SSDs or migration between storage tiers. We plan on having FC or SAS drives for our most used data and SATA/FATA drives for the lesser used data which is how we have the EVAs configured. We also do not need any SAN-level snapshotting or replication.

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  • iSCSI SAN RAID 10 Performance -- Poor Read, Good Write

    - by Litzner
    I have a EqualLogic PS4000 SAN unit with the latest firmware, setup in RAID 10. I have 3 2TB Volumes on the SAN shared out via iSCSI on 2 eth ports on two different subnets. I have moved a test server over to this newly setup SAN, and my testing is showing me a problem. I am getting dismal read performance in everything except a test with 32 queue depth (see attach image) Write performance seems to be right about where it should be. I have tried MPIO on and off, on was slightly better but not much.

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  • Should I install software on a "SAN"

    - by am2605
    Hi, I need to set up ColdFusion 9 on a ubuntu server that has a SAN disk mounted. Is it appropriate to install the CF server software on this disk? I don't really understand the ins and outs of what a SAN is, so I am not sure if the intention is for me to solely install web content on it or whether the server software itself should go here too. Any advice would be extremeness welcome. Many thanks, Andrew.

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  • Considerations for spanned volumes with SAN's LUN.

    - by Patrick Pellegrino
    I want to know, before going forward, what I can expected in lost of performance (or not) of creating Windows spanned volumes from LUN delivered by a SAN ? I don't know which kind of SAN is (we don't administer it), but they give us 10 300 Gb LUN to our Windows 2k8 R2 (Vmware) and we need larger volume so we think to spanned some disk but we are aware of the performance issue. Any input ? Regards.

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  • cPanel web servers mounting home partition to a NAS or SAN

    - by Scott
    Hello, I currently have 2 cPanel web servers that are little 1RU dual cpu quad core xeons. They have a lot of resources for processing and handling web requests, and never exceed more than 10% cpu usage. They also have plenty of RAM. The problem is though that they both have RAID 1 160Gb SAS hard disk drives in them that are 75% full, and growing by the day. I didnt think that the amount of disk usage would be so high, but due to the nature of the sites hosted, this has become an issue. The easy fix would be just to upgrade the hard drives to something bigger (probably not of the SAS variety), but I am thinking of keeping the current machines as "processing servers" and buying a central "storage server" with about 12TB of storage. The /home/ partition on each of the 1RU servers would be mounted to a NAS or SAN point on this central storage server. My questions are: - Has anyone got a cPanel setup where they mount /home/ to a NAS or SAN elsewhere? If so, can you provide details as to what you did and how it went :) - Any recommendations on networking? Is gigabit ethernet enough? Is TCP/IP going to be a noticable performance problem? Anyone used a TOE key? - Anyone benchmarked or had any performance issues with SAN over NAS? Any help greatly appreciated. Scott

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  • SAN Replication for Fault tolerance using EVA4400

    - by Sergei
    Hi Everyone, I hope that someone would point me in the correct direction - it looks like I have no enough konwledge in the subject and timeframes are too tight for me to explore different scenarios in depth.. We have two datacenters few miles away from each other connected by 100 Mbps link.Each datacenter will have 5 BL490 blades with ESX Standard hosting about 50 VMs. Eac hsite has HP eva4400 SAN with SAN replication set up.VC is going to be in the first datacenter and both datacenter are networked. SAN Replication is block level so it seems like I cannot just replicate changes but all writes would have to be replicated.This should not be a problem as link can sustain about 1.8 TB a dayand data can be buffered. I am having trouble however visioning how recovery would work in this case.We don't need instant recovery , I would say 4 hours recovery time is accepted so fancy automatic SRM like DR scenario would not be easily accepted due to the financial reasons, however any comments are welcomed. Current idea is following: replicate LUNs from primary site to the secondary.When disaster strikes, IT personnel switches on ESX hosts on the remote side and connects replicated LUNS to them, then registers VMs and changes IP address. I understand that this seems like horribly manual process and I almost sure I have missed some obvious pitfalls here. Could someone let me know what direction should I go?An articles regarding the subject? This is a brand new setup and we would rather build up basic recovery process and scale it later.I just need to have a right direction to allow for such scalability. Thank you very much in advance!

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  • cPanel web servers mounting home partition to a NAS or SAN

    - by Scott
    I currently have 2 cPanel web servers that are little 1RU dual cpu quad core xeons. They have a lot of resources for processing and handling web requests, and never exceed more than 10% cpu usage. They also have plenty of RAM. The problem is though that they both have RAID 1 160Gb SAS hard disk drives in them that are 75% full, and growing by the day. I didnt think that the amount of disk usage would be so high, but due to the nature of the sites hosted, this has become an issue. The easy fix would be just to upgrade the hard drives to something bigger (probably not of the SAS variety), but I am thinking of keeping the current machines as "processing servers" and buying a central "storage server" with about 12TB of storage. The /home/ partition on each of the 1RU servers would be mounted to a NAS or SAN point on this central storage server. My questions are: - Has anyone got a cPanel setup where they mount /home/ to a NAS or SAN elsewhere? If so, can you provide details as to what you did and how it went :) - Any recommendations on networking? Is gigabit ethernet enough? Is TCP/IP going to be a noticable performance problem? Anyone used a TOE key? - Anyone benchmarked or had any performance issues with SAN over NAS? Any help greatly appreciated. Scott

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  • Performance of Cluster Shared Volume file copy from SAN

    - by Sequenzia
    I am hoping someone can help me out with a strange issue. We are running a Microsoft Failover Cluster with Server 2008 R2 and an Equallogic PS4000 SAN. Our main configuration has 2 Dell Poweredge T710 Servers in the cluster. We have CSV and Quorm setup. The servers each have 10 Broadcom 1Gb NICs. Right now 4 of the NICS are on the iSCSI network for accessing the SAN. They use MPIO and the Dell HIT pack. We have 5 VMs running on each node and everything runs smooth. No noticeable performance issues or anything. From the SAN I can see the 4 iSCSI connections from each server to each volume (CSV and Quorm). Again, it seems to perform great. The problem I am running into is with backups. I have tried a few backup programs like backupchain and Veeam. The problem is both of them are very very slow to backup the VMs. For instance I have a 500GB (fixed disc) VHD that’s running on the cluster. It takes over 18 hours to backup that VHD and that’s with compression and depuping turned off which is supposed to be the fasted. We also have a separate server that is just for backups. It has a lot of directed attached storage. As part of the troubleshooting I decided to bring that server into the cluster as a node. It now has access to the CSV and can read from C:\clusterstorage\volume1 which is where our VHDs live. This backup server only has 2 NICs. 1 NIC is going to the iSCSI network and the other is just on the main network. It has Intel NICS in it without any sort of MPIO or teaming. So with the 3rd server now in the cluster I started doing some benchmarking. I have a test VHD that’s about 7GBs that’s stored in the CSV. I have tested file copying that VHD from all 3 servers to directed attached storage in the respective server. The 2 Dell servers that are the main nodes in the cluster (they house the VMs) are reading that file at about 20Mbs/Sec. Which at that rate is way to slow for the backups. The other server which only has 1 NIC to the SAN is reading at around 100Mbs/Sec. I spent a few hours on the phone with Dell today about this . We went through all kind of tests and he was pretty dumb founded. He really has no idea why that server with only 1 NIC is reading about 5 times as fast as the servers with 4 NICS and MPIO. We looked at the network utilization of the NICs while the file copy was going on. The servers with the 4 NICs had a small increase of activity during the file copy but they only went up to around 8-10% on all 4 NICs. The other server with the 1 NIC jumped up to over 80% during the file copy. I plan on doing some more testing after hours and calling Dell back tomorrow but I really am confused (and so is Dell’s support rep) why I cannot get faster file copy access to the CSV on those servers. Anyone have any input on this? Any feedback would be greatly appreciated. Thanks in advance.

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  • ESX hosts lose connectivity with iSCSI SAN LUNs

    - by Themist
    I've been experiencing this issue for a couple of months now where my ESX hosts lose connectivity with my iSCSI SAN vmfs volumes. As a results the ESX hosts enter a nonresponsive mode the associated VMs disconnect and the only remedy is to reboot the host. This issue happens randomly . I have escalated this issue with VMWare but I haven't had any solution to the issue yet. I see no errors on my switches and there are no hardware issues as well. My SAN infrastucture is solid and there are 2 paths for every vmfs volume. Did anybody else experienced a similar issue? Themis

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  • On Server Disk Storage VS SAN Storage

    - by Justin
    Hello, I am looking at buying three servers, and trying to figure out which storage solution makes the most sense in terms of performance and cost. Total budget is around: $10,000. OPTION 1: Dell servers with RAID 10 (4 Drives) each 7200RPM SAS 500GB, for a total capacity of 1TB. Each server is approx: $3000. Total storage then across all three servers is 3TB. OPTION 2: Same Dell servers with a cheap single drive no RAID for $2000 and go with a centralized SAN solution. The biggest problem is that I haven't been able to even find a SAN solution that is a reasonable price. Dell entry level storage servers are like $15,000. I am thinking just iSCSI, not fiber (too expensive). What do you guys recommend?

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