ASM vs San raid which to adopt

Similar Questions

• SAN - RAID set

  Hello

  I am a newbie to vSphere 5 & am in the process of setting up a test lab. I use 2 x ESXi5 (HP 380 G5) hosts & an iSCSI SAN (380 G5).  I'm not sure of the best configuration for the entire SAN RAID. I would appreciate some recommendations on the best way to configure this small SAN lab.

  Should I create 1x1.4TB than defined R5 or a 2 x 700 GB RAID 5?  A configuration is better than the other?

  He is create 2 LUNs, one per raid array & a VMFS per LUN. I may be running on the 5-7 VM per LUN, none of the VM being I/O intensive. The hosts does not also start from SAN.

  SAN Configuration (HP 380 G5)

  2 x DUAL core CPU Xenon

  16 GB OF RAM

  1 X P400 controller

  2 x 72 GB - RAID 1 (OS - ESXi5 + Open spinning)

  6 x 300 10 k SAS = 1.4 TB in RAID 5

  Concerning

  Bob

  I create a unique set of RAID5 with all 6 discs (or 5 drives + spare), and use the ACU (Array Configuration Utility) to create at least two logical volumes on this RAID set. Although it is not necessary to create multiple volumes from a technical point of view, this configuration will allow you to 'play' with features like the migration/storage vMotion in the lab environment. BTW. you will have a much better performance of disk with BBWC (512 MB or more) for the RAID controller.

  André

• SAN / RAID / vCenter number

  Interesting day today.

  We have a virtualized environment 5.1 mixed with light clients Sunray and Solaris 10. We have load-balanced Terminal servers and the virtual machine running the load balancing software was inadmissible, as the domain controller. In fact, 4 of our 10 guests were inadmissible. No one could connect so we have to try to determine what it was. First tried to get guests in the data center. After a lot of troubleshooting and a few reboots, we managed to get the hosts back in and operational things. Except that we found that a number of servers is grayed out and "inaccessible". Fortunately, we had backups VMDK so they have been restored and troubleshooting more has taken place.

  It seems that the data store containing the load balancer and the DC went offline at 03:30, and some time later re-presented as a disk empty. I re-read the HBA and the storage and then tried to readd and was the screen I've met:

  

  .. and after reviewing the events, I found this:

  

  Our SAN is a Fujitsu DX90 and I have a ticket open with Fujitsu but I reason to assume that this is a problem with the RAID on the SAN? I'm sure that's not CF related that we would see a host of other problems of connection. I followed this KB on the identification of records and trying to access the volume through SSH: http://goo.gl/QHJV1 - but, so far, I have managed to get the volume. Which leads me to believe that he is in fact a question RAID.

  My other question is the SAN are smart enough to do something if a RAID goes down? Should not be some sort of redundancy? And if not what you might find on a newer SAN?

  Or was it due to vCenter and something wrong at 03:30 thus wiping the RAID?

  Problem solved. I think that we had a reservation for SCSI.

  Restarted guests, out of the reserve of LUN on the interface graphics of SAN, reread and we're back in business.

• ASM and SAN issues HQ

  Hello

  I have a few problems in ASM 4.6 and SAN HQ 3.0.

  SAN AC 3.0:
  I get alerts email saying that network connectivity is not even if there is no network connectivity issues.  The message is below:

  • [ID: 14.2] A connection could not be made.
  • The HQ SAN server issued the group SNMP requests, some or all failed.  This condition is probably due to the congestion of the network or has no network connectivity.  The server will try again in 60 seconds.  Check your network connectivity and that the storage group is online.  If the problem persists, contact your Dell support provider.

  ASM 4.6:
  For some reason when ASM is refreshing the host, it never ends with one of the hosts (in a cluster).  It sticks to the discovery of Cluster connectivity and I don't understand why.  I also get e-mail alerts saying that Smart snapshots failed.

  Can someone please?

  Thank you.

  There SANHQ available from eqlsupport.dell.com/.../download.aspx 3.0.1

  From the release notes:

  Elements fixed in SAN HQ Version 3.0.1

  The following question has been corrected in the version 3.0.1 SAN headquarters maintenance release:

  Previously, after SAN HQ 3.0 upgrade HQ SAN server could not connect to the newsgroups under firmware version 7 or more and SAN HQ has published an alert (HQ SAN event ID: 14.2) indicating that some or all SNMP requests the group failed.

  This condition is resolved.

• How to identify the ASM DiskGroup attached to which disks?

  Hi guys,.
  
  In RAC 11 GR 2, how to identify which ASM Diskgroup is attached to which disks... (OS is RHEL 5.4).
  
  We could list ASM starts by,
  *#oracleasm listdisks * but this command does not display the disks assigned to ASM DiskGroup.
  
  Even for check location of OCR and voting disks only show Diskgroup name and not the actual discs.
  $ocrcheck
  $crsctl query css votedisk
  
  
  (as in gr 10, 2 RAC, we entered /etc/rules.d/udev/60-raw-rules raw file mapping of the OCR, voting disk and other ASM Diskgroup)
  
  
  Please help me, as long as the customer place, I could see LUN as assigned to the server and get is not an exact idea whose records have been used for OCR and voting disk DATA Diskgroup.
  
  
  Thank you
  Manish

  And for this, you can use oracleasm querydisk. Using that you can identify which device marked for asm or not. for example you can see below the example.

  [oracle@localhost init.d]$ sqlplus "/as sysdba"
  
  SQL*Plus: Release 10.2.0.4.0 - Production on Thu Jun 3 11:52:12 2010
  
  Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
  
  Connected to:
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
  With the Partitioning, OLAP, Data Mining and Real Application Testing options
  
  SQL> select path from v$asm_disk;
  
  PATH
  --------------------------------------------------------------------------------
  /dev/oracleasm/disks/VOL2
  /dev/oracleasm/disks/VOL1
  
  SQL> exit;
  
  [oracle@localhost init.d]$ su
  Password:
  [root@localhost init.d]# /sbin/fdisk -l
  
  Disk /dev/sda: 80.0 GB, 80000000000 bytes
  255 heads, 63 sectors/track, 9726 cylinders
  Units = cylinders of 16065 * 512 = 8225280 bytes
  
     Device Boot      Start         End      Blocks   Id  System
  /dev/sda1   *           1        1305    10482381   83  Linux
  /dev/sda2            1306        9401    65031120   83  Linux
  /dev/sda3            9402        9662     2096482+  82  Linux swap / Solaris
  /dev/sda4            9663        9726      514080    5  Extended
  /dev/sda5            9663        9726      514048+  83  Linux
  
  Disk /dev/sdb: 80.0 GB, 80026361856 bytes
  255 heads, 63 sectors/track, 9729 cylinders
  Units = cylinders of 16065 * 512 = 8225280 bytes
  
     Device Boot      Start         End      Blocks   Id  System
  /dev/sdb1               1        4859    39029886   83  Linux
  /dev/sdb2            4860        9729    39118275   83  Linux
  [root@localhost init.d]# ./oracleasm querydisk /dev/sdb1
  Device "/dev/sdb1" is marked an ASM disk with the label "VOL1"
  [root@localhost init.d]# ./oracleasm querydisk /dev/sdb2
  Device "/dev/sdb2" is marked an ASM disk with the label "VOL2"
  [root@localhost init.d]# ./oracleasm querydisk /dev/sda1
  Device "/dev/sda1" is not marked as an ASM disk
  [root@localhost init.d]#
  

  Also in windows:

  C:\Documents and Settings\comp>asmtool -list
  NTFS                             \Device\Harddisk0\Partition1           140655M
  ORCLDISKDATA1                    \Device\Harddisk0\Partition2             4102M
  ORCLDISKDATA2                    \Device\Harddisk0\Partition3             4102M
  NTFS                             \Device\Harddisk0\Partition4           152617M
  
  C:\Documents and Settings\comp>
  

  answered by Alex.
  Reference:-How to identify what disc rawdevice is named as VOL1 in ASM OS level

  Happy new year.
  Kind regards

• iSCSI or NFS + ASM of SAN

  Hello
  
  my questions look at stupid.but it's a matter of simple vary.
  Should I have any iscsi or SAN to install clusterware GR 11, 2 to 5.4 x86_64 OEL?
  
  concerning

  1. create the file

  DD if = / dev/zero bs = 1024 k count = 1000 = / disk1

  2 driver installation closure

  losetup/dev/loop1 /disk1

  3 instrument brand

  oracleasm createdisk LOOP1/dev/loop1

  4 use with ASM

• Storage EMC SAN for ASM

  Hi all
  
  We have an EMC SAN storage system used by several databases. Our dbs are 10.2.0.3 and MS Windows Server 2003. We have two RAID types: RAID10 and RAID5. We use RAID10 for database data files and we have almost exhausted RAID10 so I need to add RAID 5 LUNS to our databases. My question is: should I add new LUNs (RAID 5) to an existing ASM diskgroup (which uses RAID10) or create a new ASM diskgroup with RAID 5 lun. My instinct tells me to create new diskgroup. But I would like to get the inputs of experts out there. Thanks a lot for your help in advance.
  
  Shirley

  Create a new diskgroup.

  But I recommend the purchase of new disc and not sink into the depths of despair with RAID 5.

  http://www.baarf.com

• Is have RAID (1 + 0) so that Failgroups for all ASM ASM starts is a well-known best practice?

  Dear Experts,

  Is have RAID (1 + 0) so that Failgroups for all ASM ASM starts is a well-known best practice?

  Having both is the best practice

  • RAID (1 + 0)
  • ASM Failgroups for all ASM starts

  Thank you

  IVW

  You can create groups of ASM disks with normal or high redundancy or specify external redundancy. It depends on your reliability requirements and storage performance. Remember that ASM is not RAID and redundancy is the base file. ASM uses alternating devices. Oracle is generally recommended to have redundancy of storage. If you have RAID redundancy at the level of hardware controller or storage, Oracle recommends to configure ASM disks with external redundancy groups. Redundancy of the DSO is only between groups of disk failure and by default, each device's own failure group. Of course, you always want to make sure that you do not rely on redundancy of data between logical devices or partitions residing on a single physical unit. Compared to external RAID redundancy redundancy ASM using will give the DBA more control and transparency on the setting of the underlying.

• Advice on which drive hard buy for Raid

  I'm going to buy http://www.newegg.com/Product/Product.aspx?Item=N82E16822136544 8 these hard drives, and I'll use a http://www.newegg.com/Product/Product.aspx?Item=N82E16816131004 raid controller to implement RAID 3. Western Digital know that these drives are not suitable for the raid, disk only I can find, is a http://www.newegg.com/Product/Product.aspx?Item=N82E16822136797. I was wondering if there is a difference actaul between these two that makes the difference. Also, I was wondering if anyone of you knows another hard drive that would be good for the raid which is less than $ 100.

  Your choice of reader and the controller look good for me.

  I have used a controller Areca with WD black for the past two years, and as long as you do not have a form any backup other than redundancy RAID 5 on your PC, you should be OK with the readers of 'consumer' (aka black WD, Hitachi sister, etc.) as opposed to "enterprise" drives for RAID (AKA WE RE3 RE4, Hitachi Ultrastar etc) systems.

  Records of the company are:

  -usually best parts - possibly some companies choose the best boards with defects less for their dearest readers

  -Sometimes a few features that help with vibrations caused by multiple drives in a PC working in tandem

  -almost always a feature that will keep the drive of the company to continue to try to correct any error while reading or writing beyond a certain number of seconds. WD calles this TLER (time limited error recovery);

  I've seen individuals suggesting that setting the spin-up time is increased from the default.7 seconds up to 1 second when you use consumer readers to help prevent consumer drives marked as bad. I did this and I have never had a car abandoned in two years.

  I have about 50% business (RE3 1 TB WD) and about 50% of consumer records (Black 1 TB 32 MB cache) that are very similar, with the exception of the firmware. In two years, I had a bad drive; No data has been lost, performance just the RAID and even that was pretty subtle. And by the way, it was one of the RE3 drives aren't infected, one of consumer readers! When I started with the WD drives, it was possible to download a software and to set the time on consumer drives TLER and gain many of the benefits models company without having to pay for more expensive readers. Then, a year ago WD changed their line WD Black to defeat this utility (it was a utility WD TLER!) to work with their readers of consumers; Yes, their were some upset users on this one!

  Jim

• Snapshots created with the EqualLogic VSS provider are not displayed in SAN HQ

  Hello

  Poster for the first time. We have just implemented an EqualLogic SAN, PS6100X network, and we're having performance issues between our DPM backup server, one of our hosts Hyper-V and VM images stored on the San. I will try to provide as much information as I can

  Environment:

  Dedicated iSCSI using Dell Force10 switches network

  hyper-V (Windows Server 2008 R2) 3 hosts
  -2 hosts has a NETWORK 4 port GB dedicated adapter connected to the iSCSI network; 1 host has connected to the network iSCSI NETWORK 2 GB dedicated ports card
  -Each Hyper-V host computer has a dedicated on the EQ SAN, RAID-50 volume that stores the Hyper-V virtual machines
  -EQ VSS provider installed on all hosts Hyper - V 3 and works correctly

  Using DPM 2010 for backup

  Problem: on Hyper-V hosts 1 and 2, any/all backup activities are very slow. On the Hyper-V host 3rd, however, activities related to backup all are incredibly fast! We compared the NIC configurations, HIT / settings ME and ASM, but we cannot understand why it is so slow on hosts 1 & 2.

  In addition, whenever DPM 2010 tells the EQ VSS provider to create a snapshot, we see the snapshot being created in the EQ Team Manager, but he does not appear in the list of iSCSI connections. According to the documentation SAN HQ, instant and volumes should appear here.

  We also disabled TcpAckFrequency for all 3 hyper-v hosts. It helped a little, but there is still a HUGE difference with regard to backups of the DPM.

  We're pretty sure that there is something misconfigured on the hosts Hyper - V 1 & 2, given that the host Hyper-V 3 has no performance issues.

  How can I get snapshots to appear in the list of iSCSI SAN HQ connections?

  Version information:
  SAN AC = 2.2.0.5924
  Storage Array Firmware = 5.2.4

  There are two different issues in this post for the SANHQ doesn't show only not iSCSI connections.

  Now SANHQ displays the correct total connection number but doesn't provide details of connections individual iSCSI for snapshots, which it should. So in the meantime use Workgroup Manager that shows the details for each snapshot (I know that's not the best answer, it's a short term solution).

  The fact the SANHQ shows details of instant connection does not mean that they aren't here and I can't imagine anything to do with the question of the DPM.

  The real difficulty, look for upcoming beta SANHQ and subscription for this on the EQL support site. You can do it now.

• ASM will support Extern and up at the same time?

  I'm confused.  If we have a group of redundant San who maintain the ASM disk group and our type is set to Extern, we put our confidence in snapshots, replication, and so on in the hands of the SAN.

  Can you have Extern and high?  You can have ASM diskgroup that lies on the SAN but too high?

  If you can not, then if you raised, and these starts on the SAN, what's the difference?  Are not often required database on a San with a server on the front-end server?

  ASM diskgroup redundancy and redundancy SAN are not the same and work completely different. You cannot use extern ASM and redundancy high at the same time.

  A San doesn't know anything about Oracle database files and redundancy is usually accomplished in RAID. ASM is not RAID and does not duplicate complete records. ASM data redundancy is based on failure of disk groups and file extensions. ASM knows by the way of the Oracle database files and automatically adjusts the deletion of data, which does not have a SAN. ASM has also the advantage of the storage size can be adjusted dynamically when the storage is online, without having to rebuild your storage devices. Rebuild or expand a SAN solution based RAID usually means to reset the storage.

  Beware of the features of snapshot and SAN replication because they cannot provide full backup or redundancy if you lose the full storage.

• Disks / start transposition ASM

  Hi all

  Db1 size: 700 GB +.

  Size of DB2: 2.8 TB +.

  + ASM_DG_DATA is > for CRD files

  + ASM_DG_FRA is > for rman backups / archive files in logs/EXPDP...

  > > All recommended options?

  How many drives / starts, we can keep transposition ASM (for good e/s)?

  I suggest you consult the documentation:

  https://docs.Oracle.com/CD/E11882_01/server.112/e18951/asmprepare.htm#OSTMG11000

  You can find more useful 'Recommendations for the preparation of storage'.

  For example:

  A minimum of four (Oracle ASM disks) LUNS of equal size and performance is recommended for each disk group.

  Using Oracle ASM mirroring redundancy when using no hardware RAID, or when you need host-based volume management features.

  
  

  I suggest to keep in mind that ASM is not RAID. RAID uses a fixed allocation size and reflects the data at the level of the block device. ASM reflects files by using a size of distribution variable patterns of files, which gives an advantage of performance when writing to newspapers in recovery, for example.  You can combine ASM and RAID to increase performance and features, but what you choose depends on your budget and your requirements, which is anyone's guess.

  About disk groups ASM how you create, my answer is that there is no performance gain unless you can redirect i/o to separate physical disks. At a minimum, it is best to separate the DATA and FRA, but otherwise, if all the data is on the same storage device and the path of I/O, additional disk groups will not give you improve performance.

  Unless you know exactly how you size your drive includes and how you want to limit the occupation of space by a specific disk group, several groups of disks have the potential for management fees and complications, for example when executing space in one group, while having "too much" in another.

• SAN, SQL and Exchange, Dell MD3200 strategy

  Hello world

  For background, we are a small company with < 50 users.  All users are on our Exchange Server (database currently about 100GB, WAY TOO LARGE, but I digress) and 25 of the users are on a basic SQL database application.

  I bought a pair of Dell R510 and a SAN MD3200, which will be direct-joint for the R510 via 6 GB/s Fibrechannel.  The two physical servers will have 4 connections to the San.

  The SAN is 12 discs, all 300 GB 15K drives.

  Now, I know regarding the total IOPS the MD3200 will take care of my needs, but I want to optimize the creation of a LUM (s) better as I can for the performance, and quite frankly, I'm really not sure.

  I thought to do 3 4-drive RAID 10 LUMs, but leaves me helpless.  I could go 2 5 disks RAID 5 with a hot spare per RAID, or just a big RAID 5 LUM giant with a single hot spare.

  All this will serve in a v5 VMWare environment.

  Thoughts, opinions?  And I thank in advance for your ideas

  Kevin

  I would put all the drives in a single Bay (less than what you allocate as a hot spare).   This way, you get all records that also contribute to the IO.

  Division I/O in data / logs is not a bad thing, but practically it is difficult to do and tend to end up with some discs that are too busy, while others are inactive.

• HP Pavilion dv7-6103ei AHCI/RAID?

  Hi all

  Greetings from a poster first.

  I have a Pavilion DV7-6103ei laptop, and it has been modernized with a Samsung PM810/series-470 128 GB SSD with a 1 TB of HARD drive in the second span.

  I'm not necessarily interested in a RAID configuration, but I prefer the disks to run in AHCI mode.  However, I see that the BIOS does not support changing the interface of AHCI.

  I did some research and it seems that these laptops do not support AHCI.  Is this correct?  I'm not able to find information on the RAID, which allows to AHCI when there is no current RAID configuration.

  I have intel that Rapid Storage Technology installed.

  Is my only option to run these HDDs in IDE mode?  Seems a bit primitive for a laptop as powerful.

  If anyone can advise me on a work around or so to be able to operate in AHCI mode, let me know.

  Thank you.

  Greg

  You are the very welcome, Greg.

  Your BIOS of laptop computers is indeed set to AHCI and unfortunately, I do not know why the HARD drive is labeled as a scsi device.

  I guess that's just the Windows name assigned to the drive.  I've seen this before on other PCs.

  You can install the latest driver from Intel's Intel RST and to see if it makes a difference what anyone.

  3rd file listed.  Was also the AHCI drivers too.

  https://Downloadcenter.Intel.com/Detail_Desc.aspx?DwnldID=24006

• RAID on Qosmio x 500-02 M

  Hello

  I hope for the response from Toshiba (if they read this).

  I was wondering why this model has more raid. My Qosmio (G30) last had raid which I found extremely useful. But this model does not work even if it equipped with two HARD drives.

  I think it's a real problem for me given that I use my machine for.

  Is there a model nwer soon with raid?

  Thank you

  It is user in the forum and here you will not get a response from Toshiba.
  On the new model, you might find some info on the Toshiba page but I doubt that Toshiba will offer some new hardware configurations on Qosmio x 500.