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Questions tagged [storage-area-network]

A SAN is a Storage Area Network, for providing block-level access to storage subsystems across a network.

65
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5answers
133k views

What is the difference between SAN, NAS and DAS?

What is the difference between SAN, NAS and DAS?
27
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7answers
8k views

SQL Server disk design on an ISCSI SAN

Its standard practice to separate log and data files to separate disks away from the OS (tempdb, backups and swap file also) Does this logic still make sense when your drives are all SAN based and ...
14
votes
7answers
16k views

SQL Server Files Local or NAS or SAN?

I have to install a new Server with SQL Server 2008, What do you recommend, One server with Raid 10 or the Files in a NAS? What about iSCSI should I use it? What about SAN? The server has 4Gb of ...
13
votes
5answers
71k views

SSH / SCP Server on Windows [duplicate]

Possible Duplicate: What is a good SSH server to use on Windows? Can anyone on the SF community recommend a trustworthy/easy to set up SCP server for windows. I do not want to go through the ...
6
votes
8answers
3k views

What are SAS external storage options (Promise, Infortrend, SuperMircro, …)?

We are looking for a ~32T external storage solution for two 48-core AMD servers. These will be used for a small Linux OpenVZ cloud for CPU intensive web-servers and data warehousing. Dual path with ...
14
votes
3answers
47k views

SAS vs. Nearline/MDL SAS - What is the difference?

As subject I guess, looking at SAN's and most vendors offer 10k or 15k "proper" SAS drives, many also offer 7.2k MDL/Nearline SAS drives. Does anyone have an authoritative explanation of the ...
5
votes
1answer
4k views

Mounting a disk from SAN (RHEL 5.9)

Storage admin told me he put a 3TB drive on my server from the SAN and I was asked to mount it. The only information I know is that it's on LUN 1 and that the disk is 3TB. Multipath is setup and I ...
9
votes
1answer
1k views

Why MPIO instead of 802.3ad Team for iSCSI

Doing my first server to iSCSI target and I thought i would be off to a running start by teaming my NIC on the server (conventional 802.3ad team). However, from many online sources I see this is NOT ...
7
votes
3answers
13k views

How can I use NTFS and iSCSI and not corrupt my SAN?

I know you can't use multiples NTFS machines/servers with the same SAN iSCSI target without corruption. I have multiple servers, however, that need access to the same data on the same SAN. I do not ...
15
votes
2answers
330 views

How to get free space from mounted drive Redhat 7

In our VM infrastructure, we have clustered hosts going to a SAN. What i am trying to figure out is how much "white space" is left over when deleting files within our Redhat servers. On our Windows ...
2
votes
1answer
4k views

iSCSI / SAN / Cluster / multiple NICs failover

Got a problem with NIC failover with iSCSI. Setup: A server with 3 NICs. One NIC is local network, other 2 are SAN. Using Microsoft iSCSI Initiator. A managed network switch. A QNAP SAN, connected ...
2
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4answers
3k views

Anyone have any experience with SQL over iSCSI on Equallogic boxes?

Anyone have any experience with SQL over iSCSI on Equallogic boxes? I have heard their iSCSI outperforms the competition. Also they say that spanning connections works for 2Gbps. Any thoughts on ...
0
votes
1answer
887 views

SAN Storage shared disk, files copied from other servers cannot be seen without re-mounting

I have a SAN Storage connected to my servers using fibre HBA. Using multipath, I've successfully mapped the device, formatted it as ext3, and mount it to my file system. But the problem is, the host ...
35
votes
2answers
7k views

What is a Storage Area Network, and which benefits does it have over different storage solutions?

I'm proposing this to be a canonical question about enterprise-level Storage Area Networks. What is a Storage Area Network (SAN), and how does it work? How is it different from a Network Attached ...
28
votes
4answers
33k views

Testing whether jumbo frames are actually working

Is there a command to test whether jumbo frames are actually working? i.e. some sort of "ping" that reports whether or not the packet was broken up along the way. I've an ESXi host with an Ubuntu VM ...
25
votes
15answers
20k views

Cheapest iSCSI SAN for Windows 2008/SQL Server clustering?

Are there any production-quality iSCSI SANs suitable for use with Windows Server 2008/SQL Server for failover clustering? So far, I've only seen Dell's MD3000i, and HP's MSA 2000 (2012i), which both ...
18
votes
3answers
3k views

150 TB and growing, but how to grow?

My group currently has two largish storage servers, both NAS running debian linux. The first is an all-in-one 24-disk (SATA) server that is several years old. We have two hardware RAIDS set up on it ...
14
votes
9answers
40k views

How many disks is too many in this RAID 5 configuration?

HP 2012i SAN, 7 disks in RAID 5 with 1 hot spare, took several days to expand the volume from 5 to 7 300GB SAS drives. Looking for suggestions about when and how I would determine that having 2 ...
3
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7answers
11k views

OpenFiler in large production environment

Does anyone here have any experience with OpenFiler in a large production environment they would like to share? We have about 3 TB of document images and databases and expect to grow rapidly in the ...
9
votes
5answers
4k views

Is there a Distributed SAN/Storage System out there? [closed]

Like many other places, we ask our users not to save files to their local machines. Instead, we encourage that they be put on a file server so that others (with appropriate permissions) can use them ...
3
votes
6answers
5k views

What is typical SAN performance?

I have very little experience with SANs, so please excuse this newbie. One of our production sites has an HP EVA8000 SAN with a bunch of disks (forget exactly how much). it has been configured into a ...
3
votes
3answers
8k views

How to best tune Dell PowerVault MD3600i SAN/Initiators for best performance?

Recent owner of a Dell PowerVault MD3600i i'm experiencing some weird results. I have a dedicated 24x 10GbE Switch (PowerConnect 8024), setup to jumbo frames 9K. The MD3600 has 2 RAID controllers, ...
7
votes
3answers
7k views

When using thin-provisioning with ZFS, how do you make sure you don't run out of physical disk space?

Forgive me if this seems like a fundamental question, but I couldn't really find anything concrete on Google, and I'm not a system administrator by trade. We are setting up a SAN at our office using ...
3
votes
3answers
6k views

How does the LeftHand SAN perform in a Production environment?

I previously asked this ServerFault question: Does anyone have experience with lefthands VSA SAN The general consensus looks like it does not perform well enough for a production SQL server even at ...
9
votes
5answers
2k views

Is brand-name NAS overpriced?

NetGear's ReadyNAS 2100 has 4 disk slots and costs $2000 with no disks. That seems a bit too expensive for just 4 disk slots. Dell has good network storage solutions too. PowerVault NX3000 has 6 disk ...
6
votes
8answers
13k views

Can you use your own drives on Dell PowerVault MD3000i?

I would like to use my own drives in the Dell PowerVault MD3000i. Does anyone know if you are able to? We are looking at different SANs for our VM farm and would rather be able to replace a drive in ...
4
votes
1answer
670 views

ESXi 5x: Changing number of IOPS per path sees dramatic improvements

I'm a bit embarrassed that I've never seen or used the -iops parameter as part of the esxcli deviceconfig options. I stumbled upon an article and proceeded to benchmark before and after using various ...
3
votes
4answers
4k views

What are the choices for iSCSI target support for Linux?

I recently purchased an IBM BladeCenter E chassis with HS21 blades. I'd like to build a SAN so the HS21 blades will have more storage space. From everything I've read, iSCSI seems to be the best ...
3
votes
3answers
13k views

Does splitting out Data, Logs, and TempDB matter using a SAN with SQL 2008

I'm not a server admin. So be gentle. But I was just at a conference and in one of the training classes the Instructor explained some SQL DBA best practices. One of which was to separate out Mdf,...
0
votes
1answer
3k views

How to set up FCoE target under Ubuntu?

We have: Ubuntu 10.04.2 LTS installed MegaRAID controller with 2 virtual RAID10 drives. 2x 10GbE dual port adapters (Supermicro AOC-STGN-I2S aka Intel 82599) We need to make those Megaraid drives ...
8
votes
1answer
454 views

Using non-certified hard drives in Dell MD3220 storage array

Is it possible to use non-certified hard drives in a Dell MD3220 storage array? I ended up getting 3 new drives that were the EXACT same model number as the existing ones. Then I bought the drive ...
6
votes
2answers
5k views

Does adding more drives to a RAID 10 Array increase performance?

I'd like to know if I were to add additional drives to an existing Raid 10 if this would increase the speed of the entire array?
6
votes
1answer
788 views

Completely disjoint iSCSI networks vs dedicated switches and VLANs

I'm looking for best practice or pros/cons for deploying an iSCSI storage network. The two options are: A completely disjoint iSCSI storage network Dedicated switches with a separate VLAN for ...
3
votes
1answer
2k views

iSCSI SAN - Network adapter bottleneck

My new database server (Windows Server 2008 R2) has a 4 Gbps connection to my Dell EqualLogic iSCSI SAN. I've been testing it by backing up multiple databases at the same time. There appears to be a ...
3
votes
1answer
2k views

SAN: is it better to have separate LUNs for operating system and data of virtual machines? [closed]

We have an iSCSI SAN that will be used as backing store for virtual machines. We use Xen and will directly present the LUNs as block devices of VMs (so there is no file system with files on it for ...
3
votes
3answers
444 views

Disk-to-disk backup to same storage array?

We're looking to get a new SAN, and so we're re-examining our storage, network and backup issues. Our plan is to get an EMC VNXe 3100 with SAS drives for production data, then buy an expansion shelf ...
2
votes
2answers
2k views

Are there any SAN vendors that allow third party drives? [closed]

I'm trying to convert our SaaS platform to SSDs for performance reasons, and wanted to use the new Intel DC3500. But our Dell SAN only accepts authorized Dell drives, and their only options are eMLC ...
2
votes
1answer
1k views

Configure Windows to Read/Write Shared SAN

I am working on building a NLB cluster to load balance for JavaEE portal. Both are Virtual Windows 2008 R2 and connected via Fiber Channel to an EMC SAN Storage. They should read/write files into the ...
2
votes
1answer
419 views

Are Dell PowerVault MD3200 EMMs compatible with the MD1200 chassis/midplane?

I have a Dell MD1200 chassis with PSUs, and I have yet to buy the EMM units. I was wondering if I could buy the MD3200 EMMs and have it function as an MD3200 or if I have to buy the MD1200 EMMs. I ...
1
vote
2answers
643 views

VMware vsphere essentials plus network cabling

I'm not sure how many NICs I need to use to have vmotion support with my SAN. See the link for a picture, it's laughably crude. Sketch
1
vote
2answers
7k views

Mounting LUN from EMC VNX5300 via FC on Centos 6

On my VMX5300, I have created LUNs, configured hosts etc. Mounting LUNs in my ESXi is very simple, ESXi host discovered new FC device and with a few clicks I was able to mount new FC storage. On ...
1
vote
3answers
734 views

IBM Bladecentre H Bootup Sequence Control

I have a bladecentre with blades, network and a SAN in a single rack. What I'd like to do is control the startup of the bladecentre so that when the rack is powered on that the blades will delay ...
1
vote
4answers
3k views

Does anyone have Experience with LeftHand's VSA SAN? [closed]

I am looking at re purposing some hardware and build out a virtual environment. I am looking to use the LeftHand VSA (Virtual Storage Appliance) to serve the local disks as a SAN to the virtual ...
0
votes
2answers
1k views

SAN + MySQL replication- is that what I want for my load-balanced Drupal cluster?

I need to put together a Drupal instance using Drupal's built-in multisite features, which will allow me to use a single code base for all the sites- a big time-saver and headache-preventer. We're ...
0
votes
3answers
865 views

Resetting EqualLogic PS6000XV iSCSI SAN Storage

K, so some background first. Just started working for this company as their sort of backup IT person. They have a bunch of projects that they never have to the time to work on, one such project is ...
0
votes
3answers
2k views

Failover clustering: tempdb on SAN?

We are considering clustering our SQL Server 2008 EE instances. The storage is on SAN. Can we put tempdb data/log files on SAN? What are the pros and cons on this solution? For optimal performance, ...
0
votes
1answer
607 views

RAID 10 Cluster Size for SQL Dynamics AX Database

Many article read and many websites visited yet still no closer to a firm or concrete answer. We have created all our Arrays for our SQL 2012 installation with the appropriate LUN's and understand ...