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| Unique Visitors: 0 |
| Total Unique Visitors: 1296976 |
| Visitors Out: 10464 |
| Total Visitors Out: 63154 |
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| vSphere Management App for iPAD |
| 2010-09-11 14:44:00 |
An interesting application to manage your vmware vsphere datacenter … through an Applie iPAD. Pretty interesting .. The app is still in its early stages, but the demo shows great features of the app. Watch this video from vmworld TV.
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| Vsphere Tutorial & demo videos |
| 2010-09-10 14:15:00 |
Mike Laverick has done a great job in sharing out the Vmware Vsphere video tutorials, that clearly explains number of vsphere concepts, howto and technologies in details. Worth watching! Watch the vsphere tutorial demos at Mike Laverick’s page : http://www.rtfm-ed.co.uk/?page_id=1442
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| Tuning Netapp snapmirror/snapvault speed |
| 2010-09-09 14:14:00 |
In Netapp, there is a option to set/limit bandwidth of all snapmirror and snapvault transfers. The option can be either system-wide or for a particular transfer. We can tune either the transmit bandwidth on the source or the receive bandwidth on the destination or both together. For particular transfer, you can tune the throttle from snapmirror.conf. When both per transfer and system-wide throttling are configured, throttling at system wide is applied only if the combined bandwidth used by all the relationships goes above the system-wide throttling value. System-wide throttling is enabled by using three new options using the options command. To list the tunable replication throttle values: destination-filer*> options replication replication.t...
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| Netapp Deduplication – quick setup guide |
| 2010-02-15 09:41:00 |
Deduplication refers to the elimination of redundant data in the storage. In the deduplication process, duplicate data is deleted, leaving only one copy of the data to be stored. However, indexing of all data is still retained should that data ever be required. Deduplication is able to reduce the required storage capacity since only the unique data is stored. Netapp supports deduplication where only unique blocks in the flex volume is stored and it creates a small amount of additional metadata in the dedup process. The NetApp deduplication technology allows duplicate 4KB blocks anywhere in the flexible volume to be deleted and stores a unique one. The core enabling technology of deduplication is fingerprints. These are unique digital signatures for every 4KB ...
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| Linux Enterprise Cryptographic Filesystem : ecryptfs |
| 2010-01-27 09:16:00 |
eCryptfs is a stacked cryptographic filesystem embedded within the Linux kernel. Being a stacked filesystem, it can easily encrypt and decrypt the files on your Linux server as they are written to or read from the hard disk. The greatest advantage of eCryptfs is that all encryption is made at the file level. This means that you don’t have to create a fixed size container to hold your files. Here are the steps how to use ecryptfs: ...
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| Dynamically detecting new disks in Linux |
| 2010-01-26 08:48:00 |
When you have new LUNs created on the SAN fabric, zoned & mapped it to the server; how can you detect the luns on the linux server online, without rebooting it?. When you dynamically add new disks to a Linux VM running on ESX server, how do you detect that disks on the Linux virtual machine?. Here are the steps to do that : Install sg3_utils and lsscsi package. [root@fedora01 ~]# # yum install –y sg3_utils lsscsi The “lsscsi” command will list the disks attached to it. If you have just attached a disk, you will not be able to see it. You can also list this using “fdisk –l” [root@fedora01 ~]# lsscsi [0:0:0:0] disk VMware Virtual disk 1.0 ...
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| OCFS2 cluster – quick setup guide |
| 2010-01-06 10:42:00 |
OCFS2 is a POSIX-compliant shared-disk cluster file system for Linux capable of providing both high performance and high availability. Cluster-aware applications can make use of parallel I/O for higher performance. OCFS2 is mostly used to host Oracle Real application clusters (RAC) database on Linux clusters. The below steps shows how to create ocfs2 filesystem on top a multipath'd SAN lun and mount it on Linux clusters. Identify the nodes that will be part of your cluster. Export/Zone the LUNs on the SAN end and check whether they are accessible on all the hosts of the cluster. (fdisk -l or multipath -ll) If you need multipathing, configure multipath and the multipathing policy based on your requirement. For Linux multipath setup, refer Redhat’s m...
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| rpm package command tips |
| 2009-12-01 19:57:00 |
If you want to find which rpm contains a specific file in your linux system, you can use "rpm -qf" to get the package information. opensuse:~ # rpm -qf /etc/vmware-tools/tools.conf open-vm-tools-2008.09.03-5.49 opensuse:~ # Find out what all dependencies on an package? opensuse:~ # rpm -qR libgcrypt11 rpmlib(VersionedDependencies) <= 3.0.3-1 /bin/sh /bin/sh rpmlib(PayloadFilesHavePrefix) <= 4.0-1 rpmlib(CompressedFileNames) <= 3.0.4-1 libc.so.6 libc.so.6(GLIBC_2.0) libc.so.6(GLIBC_2.1) libc.so.6(GLIBC_2.1.3) libc.so.6(GLIBC_2.3) libc.so.6(GLIBC_2.3.4) libc.so.6(GLIBC_2.4) libgpg-error.so.0 rpmlib(PayloadIsLzma) <= 4.4.2-1 opensuse:~ # How to list what all files a...
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| Fileop : Filesystem IO benchmarking tool |
| 2009-11-30 22:34:00 |
Iozone Linux filesystem benchmarking tool has another cool utility called "fileop". This utility does file operation on the filesystem and gives the ops/sec for each operation. This tool will be useful to test your filesystem performance as well as storage performance. Or, if you are going to select a filesystem or storage that is going to host huge number of small files (like source codes), then fileop can be used for benchmarking. Fileop can create files of different size ( with -s option ) and to different directory depth ( with -f option ). [root@bryant foo367]# /opt/iozone/bin/fileop -f 10 -s 1k Fileop: File size is 1024, Output is in Ops/sec. (A=Avg, B=Best, W=Worst) . mkdir rmdir creat...
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| Lustre – cluster filesystem : quick setup guide |
| 2009-11-08 11:09:00 |
The Lustre file system is a distributed high performance cluster filesytem that redefines I/O performance and scalability for large and complex computing environments. This is ideally suited for data-intensive applications which requires the high IO performance. Lustre components MDS – Metadata Server: The MDS server makes metadata stored in the metadata targets available to Lustre clients. MDT – Metadata Target: This stores metadata, such as filenames, directories, permissions, and file layout, on the metadata server. OSS – Object Storage Server: The OSS provides file I/O service, and network request handling for the OSTs. The MDT, OSTs and Lustre clients can run concurrently on a single node. However, a typical configuration is an MDT on a dedicated node, two or more OSTs on ...
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