0
votes
3answers
53 views

Linux: Get information/stats about storage network

I want to know as much info as possible about the SAN a linux server is connected to. What commands will give me the most comprehensive view? Simply knowing the WWN of LUNS doesn't do much for me. ...
4
votes
1answer
130 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 ...
3
votes
5answers
1k views

How to tell if linux disk IO is causing excessive (> 1 second) application stalls

I have a Java application performing a large volume (hundreds of MB) of continuous output (streaming plain text) to about a dozen files a ext3 SAN filesystem. Occasionally, this application pauses for ...
1
vote
2answers
2k 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 ...
3
votes
1answer
148 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 ...
0
votes
2answers
429 views

SQLIO and SAN performance problems

I've had a feeling our SAN is performing badly, so I ran SQLIO with the help from Mr Ozar's blog post. My first problem is that I couldn't create a 20GB test file. This is the result using 64KB ...
3
votes
4answers
968 views

Is there a performance advantage to isolating database logs and data on different volumes (same RAID array) across a SAN?

On my old server, I separated them on to different RAID arrays to improve performance. Using a SAN is new to me, so I'm not sure of the optimal configuration. SAN: 48 drives. 10K 600GB SAS. RAID 50. ...
19
votes
4answers
1k views

Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk?

Why would a heavily disk intensive application run faster on a SAN than on a Physical Disk? I would have expected the Physical disk to be slightly faster but in fact the process ran 100 times faster ...
0
votes
1answer
392 views

Does anyone use dm-cache?

Has, or does, anyone use dm-cache - specifically for caching SAN based storage locally? I'm looking for a way to speed up SAN based storage on a CentOS 5.6 + XEN Hypervisor which uses iSCSI mounted ...
0
votes
1answer
61 views

Store data on File Server or SQL database

We have a solution which includes storage of PDF documents. Currently we have 50,000 documents that are 0.6 MB each (all documents same size) We currently store these documents in varbinary(max) ...
4
votes
1answer
666 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 ...
0
votes
2answers
194 views

San Performance - Number of servers connected

Does anyone have any experience of the Ibm DS3400 san. Have found a system with about 30 servers connected to it (mostly virtual machines including all the operating system drives) including 2 sql ...
0
votes
4answers
157 views

SQL Server: Shared disk cabinet performance

Our server admin has hatched a plan to move all storage to a central disk cabinet, and have every server use that. We have a central SQL Server that is heavily use (200+ concurrent users) and I am ...
0
votes
2answers
7k views

what is the throughput of 15K RPM SAS drive? [closed]

bandwidth for a single 15K RPM disk ? 10MBps or 100MBps?
1
vote
2answers
1k views

anyone using coraid storage: ATA over ethernet?

can these enclosures be populated with SATA or SAS drives purchased elsewhere? recently Dell has made custom size slots on their PE T710 servers on which you could only place drives purchased from ...
3
votes
1answer
288 views

CORAID using only 1 of the 2 available NICs for AoE traffic

We got 6 CORAID shelves in my workplace. On 2 of them I see AoE traffic on only 1 of the 2 NICs that are attached to the SAN switch. We got jumbo frames enabled on all devices. Both NICs show up when ...
0
votes
3answers
539 views

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

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 ...
4
votes
2answers
175 views

Storage sizing for virtual machines

I am currently doing research to determine the consolidation ratio my company could expect should we start using a virtualization platform. I find myself continually running into a dead end when ...
2
votes
2answers
1k views

SQLServer Split Database File and FileGroups

I'm a software developer, but this month I've to do some db admin tasks. I've some knowledge gaps about how to split the database, here my first aproach: FileGroup for a tables FileGroup for a ...
1
vote
4answers
245 views

file share system architecture asking for advice

I am using Windows platform to setup a web based file share system. In more details, individual users could upload and share documents from web interface (content may be big document, like video ...
0
votes
2answers
94 views

HPC Data-Access & Storage Design

I'm currently working with a cluster-configured application that stores all data locally for each child node. We're having issues scaling up properly and are looking into traditional SAN and ...
32
votes
5answers
1k views

Pay no attention to that SAN behind the curtain

Once upon a time, I built my own SQL servers, and had control over drive configuration, RAID levels, etc. The traditional advice of separation of data, logs, tempdb, backups, (depending on budget!) ...
0
votes
3answers
261 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 ...
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 ...
0
votes
3answers
503 views

Why is SQL Server slow on IBM Shark hardware

I have a performance problem with a SQL Server data warehouse solution on a blade connected to an IBM Shark. Disk I/O performance seems to be pathologically slow with excessive page latch wait times. ...