SQL Server, Disk Arrays And Disk IO
May 7, 2004
Hi all,
Ok here goes,
I have a three tier system using SQL server 2000, we are currently experiencing IO bottle necks on our SCSI Raid 10 array, which holds the Data and the logs in separate partitions.
So my options as I understand it are:
Get Enterprise edition
or
Get another physical raid 10 array and separate the logs and data i.e. data on one array and logs on the other array.
I would like to try the latter but I am totally unsure how much difference this will make or whether it will make any difference at all.
Does anyone know how much performance increase I will get from using two arrays as opposed to one?
Any other advice on this scenario would be greatly appreciated.
Thanks
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Dec 28, 2006
hello,all
I am new to Sql 2000,I installed sql 2000 database in C disk,but Now I found my C disk space is smaller than before,So I want to move my databse(include data and structure) from C Disk to D Disk(its space is very large) .
is it possible to do it ?
if its can be done ,do I need to change my asp.net program source code (exp: chaneg my crystal report connectstring ) ?
thanks in advanced!
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Apr 21, 2008
Hello All,
I have a 2-node cluster environment & I am planning to replace it with new hardware. Currently I am using MSA1000 Disk arrays. Now I would like to move my storage to SAN.
What are the necessary pre-requisite and actions to do this. Any particular thing, I must take care in planning.
Any help would be appreciated.
Thanks
Dev
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Sep 10, 2007
If I return the Average, Minimum, and Maximum values for the counter Physical Disk: Avg. Disk Queue Length, and those values are 10, 0, 87 respectively, which value do I use to compute the Avg. Disk Queue Length for a 4 disk array(RAID 10): Average, Minimum, or Maximum? The disk(lun) is on a SAN.
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Nov 13, 2007
-- Initialize Control Mechanism
DECLARE@Drive TINYINT,
@SQL VARCHAR(100)
SET@Drive = 97
-- Setup Staging Area
DECLARE@Drives TABLE
(
Drive CHAR(1),
Info VARCHAR(80)
)
WHILE @Drive <= 122
BEGIN
SET@SQL = 'EXEC XP_CMDSHELL ''fsutil volume diskfree ' + CHAR(@Drive) + ':'''
INSERT@Drives
(
Info
)
EXEC(@SQL)
UPDATE@Drives
SETDrive = CHAR(@Drive)
WHEREDrive IS NULL
SET@Drive = @Drive + 1
END
-- Show the expected output
SELECTDrive,
SUM(CASE WHEN Info LIKE 'Total # of bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS TotalBytes,
SUM(CASE WHEN Info LIKE 'Total # of free bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS FreeBytes,
SUM(CASE WHEN Info LIKE 'Total # of avail free bytes : %' THEN CAST(REPLACE(SUBSTRING(Info, 32, 48), CHAR(13), '') AS BIGINT) ELSE CAST(0 AS BIGINT) END) AS AvailFreeBytes
FROM(
SELECTDrive,
Info
FROM@Drives
WHEREInfo LIKE 'Total # of %'
) AS d
GROUP BYDrive
ORDER BYDrive
E 12°55'05.25"
N 56°04'39.16"
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Nov 15, 2006
Hello,
I am trying to setup a test cluster and am having an issue. When I try to create the resource of a physical disk it takes both the drive e: and drive q: and doesn't seperate them into two physical disks as resources. This means when I try to associate the quorum disk it links the to physcial disk resource of drive e and q. Then when I try to install SQL2k5 I get the warning about installing SQL on the quorum disk. Am I missing something? Is there a way to seperate e and q onto two physical disk resources so I can specifically associate the quorum to q and the sql to e or should I be setting the quorum disk to a majority node set? Thanks in advance.
John
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Feb 20, 2001
Hello,
this is my configuration :
1) 3 disks in RAID5 that hold the SQL data
2) 1 disk in RAID0 that holds the only paging file.
What will happen to the SQL data (DB) when the disk that holds the paging file crashes?
Kindest regards,
Luc.
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Oct 17, 2006
Hi,
I have a 250 GB database and not much space left on the disk drive. I want to run SQLMAINT to do optimization and integrity checks on this db. My question is : How much work space does SQLMAINT need to perform these tasks?.
Thanks in advance for your help.
F.
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Jul 20, 2005
I am looking for an API to flush all data in memory held by SQL Serverto disk. Also, is there a tool for SQL Server like eseutil forExchange that lets you correct a SQL database?
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Oct 23, 2015
I try to find some feedback regarding setting the TempDB files on a RAM disk.Specifically I am looking for "production results" that could show the difference/benefit of such an usage.The tests on physical server and VM I already made have shown a boost in overall SQL Server 2012 performance on SQL Server instances housing data for SharePoint 2013 and Dynamics AX 2012 R2.Graphic below show differences between 5 different configuration on the same physical server:
- Physical HD: Server with local HD
- Physical SANEX1PRD: Server with TempDB files stored on a low-end SAN
- Physical SAN1: Server with TempDB files stored on a high-end SAN (around 100000 IOps)
- Physical SAN1 Jumbo: same setup with Jumbo Frame activated on NIC and DB engine
- Physical RAMdrive: with TempDB files stored on a 16 GB soft RAM drive within OS memory
Results were really impressive for the DB engine housing Dynamics AX data. My colleagues from the SharePoint team told me it also boosted a bit overall SharePoint performances but they did not have any baseline comparison to show.If you have some feedback, results, links, whatever I am interested.Indeed before setting this to all our SQL Server 2012 instances I y rather collect some *real world* feedback.
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May 30, 2007
Hello,
I have the following problem:
I'am running SQL Server 2005 Express Advanced Services on a Windows 2003 Server in a hosted Environment. Some times SQL Server is beginning writing entries into C:ProgrammeMicrosoft SQL ServerMSSQL.1MSSQLLOGERRORLOG until the disk is full.. After that, I have to delete the error log file (some GB of size), restart the server and everything is running fine until the log file runs amok again.
I have installed SQL Server Management Studio.
With SQL server 2005 Standard I can configure or disable Error logging in the Management Studio. But with the Express Edition it seems that is not possible.
What I want to do is (maybe with system stored procedures)
limit number of error log files by cycling it, e.g. 5 files and delete the old ones
limit the size of one log file. e.g. 100 MB
Is there an option to configure this in the Express edition of SQL Server 2005?
Thanks in advance
Regards
Rolf
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Jan 18, 2008
I have a question concerning where to put certain database files for the followinig RAID configurations. The server has 2 RAID configs: 2 hds in a RAID 1 and 4 hds in a RAID 10. The server will host 4 database instances: A replicated db, a Reporting Services db (which technically constitutes 2 db instances) and an application db.
In order to get the best performance, should I put the OS, SQL binary and log files on the RAID 1 config with the data and tempdb on the RAID 10? If not, please explain the best solution. Thank you!
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Aug 11, 2015
How to increase disk-space of database in sql server?
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Oct 1, 2014
Is there anyway to check if server is having disk latency or IO issues?Found below in SQL error log
Date10/1/2014 8:28:58 AM
LogSQL Server (Current - 10/1/2014 12:00:00 AM)
Sourcespid10s
Message
SQL Server has encountered 8500 occurrence(s) of I/O requests taking longer than 15 seconds to complete on file [D:Fin.mdf] in database [Fin] (5). The OS file handle is 0x0000000000001368. The offset of the latest long I/O is: 0x0001104a7da000
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Nov 5, 2015
How can I measure the disk reads and writes to see if I need to add aditional disks to the server?
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Jul 23, 2005
Hello, I have been having a bit of trouble finding help on the safestway to move data files to a different disk on the same server. Mosthelp is about moving data files to a different sqlserver. I just wantto move the files to a different drive on the same server. Any helpwould be appreciated.Thanks,David
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Dec 6, 2007
How do we identify the total disk space of a SQL Server Remotely. The procedure xp_fixeddrives gives the available free space .. but I would like to know the total disk capacity .. Any pointers?
Thanks,
Deepti
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Aug 4, 2007
As a normal sql user we are not able to get the disk space information by
executing 'xp_fixeddrive' extended stored procedure.
We are able to get the result using sa user and windows authenticated user.
Any help will be appreciated.
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Feb 22, 2007
Hi all,
I have a rookie question. I'm setting up PCs for a team of developers - all of whom will have the same hardware and software setup. I'd like to just install everything on one PC, then make an image of the PC to apply to the others. I will be installing SQL Server 2005, Developer Edition. From a SQL Server installation perspective, what special considerations will I need to make to get this going?
Any suggestions or links to online documentation would be greatly appreciated.
Thanks,
John
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Feb 3, 2008
I posted this question in the Community Server forums, but thought I would try here as well...
I am trying to use SQL Integration Services (SSIS) to dump out the images from Community Server and I'm getting zero length files. Here's what I'm trying....
I have a Data Flow Task with an OLEDB Data Source with this query (The TOP is for testing purposes) :
SELECT Top 10 cs_Posts.Body, cs_Posts.PostDate, cs_PostAttachments.FileName, cs_PostAttachments.[Content], cs_PostAttachments.ContentType,
cs_PostAttachments.ContentSize, cs_Post_Categories.Name
FROM cs_Posts INNER JOIN
cs_PostAttachments ON cs_Posts.PostID = cs_PostAttachments.PostID INNER JOIN
cs_Posts_InCategories ON cs_Posts.PostID = cs_Posts_InCategories.PostID INNER JOIN
cs_Post_Categories ON cs_Posts_InCategories.CategoryID = cs_Post_Categories.CategoryID
WHERE (cs_Posts.ApplicationPostType = 64)
Then I have an Export Column Transformation set to export cs_PostAttachments.[Content] with cs_PostAttachments.FileName as well the file name. Ultimately I'm going to break the filepath all down into folders by the category name, but for now I'm just trying to get the export working.
Anyway when I run it I end up with files with the right names, but they are all zero length files.
Any ideas?
Thanks,
-p
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Oct 5, 2007
I would be able to determine how much hard disk space is available on the Server with a SQL Query, and from an other computer on the LAN.
How can I do something?
Thanks for your help.
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Feb 18, 2015
My SQL server disk space is getting close to full capacity which is causing certain reports that we run via the SQL server to time out because I don't think there is enough space on the server.
Any tips on cleaning out a SQL server? Are there any folders that can absolutely be deleted to clear space? I know on a local computer that the %temp% folder can be cleaned out. I know when dealing with servers you do not want to make to many changes because it can cause major problems down the road.
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May 25, 2015
Quick question re a 2008 failover cluster with Node and Disk Majority:
Under healthy conditions does it matter which node owns the Quorum disk?
My understanding was that the quorum disk should be owned by the active node, in the same way that it owns the active data/log disks?
I've just finished off setting up a cluster and noticed that the quorum seems to want to be held by the passive node.
I've attempted to move it to the active node but nothing seems to happen.
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Dec 19, 2005
Hi,
The SQL Server Database hangs overnight and also consumes high disk space on one of our servers. This has been recurring for quite a few weeks and occurs daily.
Can somebody assist me in trouble-shooting the same
Thanks in Advance
Deepak
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Aug 11, 2005
Trying to install SQL Server 2005 beta version on partition disk drive sayF: (Other than local disk drive c:),Does anyone know how can I do this? During the installation, it never asksme on which drive it install to nor browse button is there to browse thedisk drive for installation...Any help???ThanksJ.
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Jul 20, 2005
I 'inherited' a group of SQL Server server class machines. They aretrue server technology but the disk sub-systems are lacking. There isone hot-swap backplane that all the drives share (with one SCSIchannel) thusly even though there are three logical drives (composedfrom 6 to 8 hard drives), they all go through one channel. This iscreating a performance issue that is noticable and can be seen invarious performance counters that Microsoft recommended one shouldmonitor in terms of disk I/O. For a cheaper 'fix', I can add aseperate two drive bay (with its own SCSI channel) with mirroreddrives. I would then mostly likely place the transaction log files onthis new channel. Or I could place the indices filegroup files onthis new channel for DBs with mainly searching going on (not muchupdating). If I went this route I would be leaning towards thetransaction log move since the second method would require me movingDBs around quite a bit. Any input on this solution (besides spendingmore money)?What I would prefer to do is get a better server class machine or addan external drive bay solution (not a SAN). I would try to get threeor four SCSI channels in the new hardware to split the differentfile/filegroups out (i.e. transaction logs files, data filegroup,indices filegroup, etc.). My only concern here is: would this moreexpensive solution be worth the money? As far as replacing servers, Ihave only two kinds of experience...replacing somewhat underpoweredservers with slightly less underpowered servers and replacing overkillservers with even more overkill servers. In both cases, the disksub-systems were fairly equivalent from the old system to the new one.Will going the three/four channel route really get data moving along?We have one server in particular that hosts a database (one of many onit) for a web application that gets decent traffic (it is a privatelogin based system for internal use and external use by our clients'agents). Periodically throughout the day, there are 2-5 minute burstswhere performance slows to a crawl. I want to spend more timeprofiling queries and such before recommending we spend more money,but the folks I am working for want quick results and there is quite abit of stored procedure logic to profile and investigate. I know thedisk sub-system is definately in need of an overhaul, but I would liketo get an idea of peformance gains from adding either one additionalchannel over the existing single channel as well as going thethree/four channel route over the existing single channel setup.Any information would be greatly appreciated.Regards,Tony
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Oct 4, 2006
I have do some benchmark test between the "Principle", "Mirror" and "Witness", things seems normal, the System usage (CPU, Disk Read/Write) on the "Witness" is very small and the CPU usage on Principle and Mirror is similar, However....
For the "Disk Write Bytes/sec", the usage on Principle is 200,000 and the Mirror is 1,500,000, the mirror server is talking about x7 times Disk Write Bytes/sec on the Mirror.
I cannot think of any reason why the Disk Write Bytes /sec is so much higher than the Principle, can somebody help me?
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Nov 24, 2015
i have create sql cluster and i need to add the Database disk as dependencies of cluster resource Server Name and i am not able to see the disk.
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Jan 31, 2008
I have a situation where I would like to set up one DB server instance for US and anther one for AUStralia. The Instance should share the same data base/hardsisk. One of the instances will be running in using US time zone and anothe one in Australia time zone.
There will be 2 Application instaces one poinint to each SQL Server instance. This applications does write into the database
So the underlying requirment is to have 2 database server running in differnet time zones but accessing the same disk/set of data
What is the best way to do this? Is it linked servers?Girish
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May 11, 2015
I tried samples of FileTable in SQL Server 2012 to store files in database. I have following questions.
1. When I right click on FileTable, and say Explore File Table Directory, I was taken to a directory. But if I search the same directory in my server/machine, the directory is not available.
2. Can I use some external server/disk as a directory for FileTable?
3. How easy is to use FileTables using .Net web applications?
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Feb 4, 2008
What is the percentage of FREE disk space that is needed for a backup? I have backups that are failing with no disk space errors. But there is enough disk. Does SQL Server need a percentage of free space all the time?
Thanks
geri
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Sep 15, 2015
I'm trying to determine how much space I would need for my data drive and log file drive to do index rebuild. I have a database which is 100gb, it is in simple recovery mode. let me know what to have a look at to determine how much space.
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Mar 5, 2007
Hi all
every time I try to verify the backup file I get the error:
backup set on file '1' is not valid (translated from italian).
this is my backup script:
BACKUP DATABASE [ahr_sistema] TO DISK = N'C:ProgrammiMicrosoft SQL ServerMSSQL.1MSSQLBackupahr_sistemaahr_sistema_backup_1.bak' WITH FORMAT, INIT, NAME = N'ahr_sistema-Completo Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10
GO
declare @backupSetId as int
select @backupSetId = position from msdb..backupset where database_name=N'ahr_sistema' and backup_set_id=(select max(backup_set_id) from msdb..backupset where database_name=N'ahr_sistema' )
if @backupSetId is null begin raiserror(N'Verifica non riuscita. Impossibile trovare le informazioni di backup per il database ''ahr_sistema''.', 16, 1) end
RESTORE VERIFYONLY FROM DISK = N'C:ProgrammiMicrosoft SQL ServerMSSQL.1MSSQLBackupahr_sistemaahr_sistema_backup_1.bak' WITH FILE = @backupSetId, NOUNLOAD, NOREWIND
GO
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