Archive for the ‘Technology’ Category

Disk Library (DL)

November 29th, 2008 No comments

This is commonly known as VTL (Virtual Tape Library).

There are quite a few variations of the existing 3 models out in the industry that can support various different configurations.

EMC entered the market late on the VTL’s, but along with presence of the front end software from FALCONSTOR, they have done amazing great in the market.

Below is a list of 3 major DL versions in the market and a small comparison chart.

Host Failover Software

November 29th, 2008 No comments

When we host accessing the Data Storage for Redundancy, Load Balancing, Application Priority, Failover, there is a host software that interfaces with storage to perform the above functions.

I have personally used quite a few of Storage Failover software’s, do believe Powerpath is one of the strongest one with the closed competition from Veritas – DMP.

Some of the key industry leaders in the Host Failover Software are

EMC Powerpath
Symantec DMP: Dynamic Multi Pathing
HP: Secure Path
Hitachi HDLM: Hitachi Dynamic Link Manager
IBM MPIO: MultiPath I/O
SDD: Subsystem Device Driver

Again the closest competitor to EMC Powerpath would be Symantec DMP.

Basic Network Storage

November 29th, 2008 No comments

Some of the very Basic Network Storage Requirements are

1) Easy Manageability
2) Higher Scalability
3) Higher Availability
4) Higher Efficiency
5) Information Sharing

Some of the Basic Network Storage Components are

1) Storage – called SAN, NAS that includes the Disk Storage.
2) Network – Host, Switch, Fiber, HBA, SCSI, Cables
3) Management Software – Some sort of Storage Management Software that manages all your storage.

Some of the Basic Storage Interfaces are

SCSI: Small Computer Systems Interface
FC: Fiber Channel

These days ISCSI is quite popular, even though it gets max speed of 1GB.

With SCSI interfaces, the speeds go upto 320 Mbps
With Fiber Channel, the speeds go up to 8 Gbps these days.

Again, your network or your storage network is only as fast as the slowest component. The idea would be to use the latest and the greatest technology to keep every component of it at a similar or equivalent speed.


November 29th, 2008 No comments

Here are some Storage Basics for beginners.

8 Bits (0’s and 1’s) for a Byte (B)
1,000 Bytes form a Kilo Byte (KB)
1,000,000 Bytes form a Mega Byte (MB)
1,000,000,000 Bytes form a Giga Byte (GB)
1,000,000,000,000 Bytes form a Tera Byte (TB)
1,000,000,000,000,000 Bytes form a Peta Byte (PB)
1,000,000,000,000,000,000 Bytes form a Exa Byte (XB)

Then comes Zetta Byte and Yotta Byte.

Normally, the accurate Kilo count is in chunks of 1,024 instead of 1000. We have left it simple and easy to learn in this case.