hdd rates-seagate 1tb-1.5tb

R

Is this a good rate for (got it from nehru place dealer)
Seagate 1tb hdd 32mb buffer Rs 7750/-
ST31000333AS- *tinyurl.com/58lkjk

Seagate1.5tb hdd32mb buffer Rs 11000/-
ST31500341AS- *tinyurl.com/4ocovq

Need to buy it today so a speedy response & views are welcome.

I bought 1TB Seagate ST31000340AS @ 7100 (incl. VAT) 1 month back from Kolkata, you should get one cheaper in Delhi... Check other shops too...

ranjan2001 said:
Is this a good rate for (got it from nehru place dealer)
Seagate 1tb hdd 32mb buffer Rs 7750/-
ST31000333AS- *tinyurl.com/58lkjk

Seagate1.5tb hdd32mb buffer Rs 11000/-
ST31500341AS- *tinyurl.com/4ocovq

Need to buy it today so a speedy response & views are welcome.

you can easily get 1TB for 7k. But I won't recommend it.

My pick will be two Seagate 500GB 32Mb buffer HDD's: each one costs 3.3k
or
two Western Digital 640Gb 16Mb buffer HDD's: costs same as 500Gig seagate HDD's.

This way you will have lot more options than having a single HDD. 1TB is very big amount of data to lose. you will be in a better position if you have two. And moreover, you get 2 for less price and they will be faster.

R

1TB is very big amount of data to lose.

I know but I need 30-40gb data to be added on daily basis for 2 months so I need over 2TB space just for storage & extra disk for processing the data. I cant back up to dvds that amount of data so reliability is indeed a prime factor.

you get 2 for less price and they will be faster

Wondering how would 2 disk be faster?
I can have max 4 disk installed in my comp 3 are already there.

you can easily get 1TB for 7k

Where from, can u tell me the source?
I am inclined towards 1.5TB hdd if I get a good price from the dealer.

Does anyone know what is the difference in following version of hdd numbers

Barracuda® 7200.9
Barracuda® 7200.10
Barracuda® 7200.11

computer warehouse, Bangalore
SP Road Bangalore

here is a better solution for you.

sell off those tiny HDD's that you have now. 160 and 250.

make that 320Gig as your primary HDD

Get two 500Gig or 1Tb HDD's and put them in RAID 0 mode (*www.acnc.com/04_01_00.html).

That will increase the data transfer to 2x the actual transfer.

Since you are saying that you hav to add 30-50gig data for two months, you do need speed and that you can get by using SATA RAID.

RAID 0 advantage: I/O performance is greatly improved by spreading the I/O load across many channels and drives

here's the best example for you: *www.hardcoreware.net/reviews/review-283-4.htm

difference in speed between 1.5Tb seagate HDD and two 1.5Tb seagate HDD's in radi 0 mode: 50-60% increase in speed

*www.extremetech.com/article2/0,2845,2332792,00.asp

^^ RAID 0 adds nothing to Data Security. As data is stripped; loss of even one drive will lead to all data being lost. :neutral:

I meant RAID 0 for performance. If data security is of utmost importance, go for RAID1.

What I mean is by getting two discs, you will have lot of options.

high IO performance and lots of storage: RAID 0 or no-raid
on-the-fly data backup and security: RAID 1
good IO performance + data security : RAID 5.

^^ Yeah. You summed it up.

R

high IO performance and lots of storage: RAID 0 or no-raid
on-the-fly data backup and security: RAID 1
good IO performance + data security : RAID 5

data security is utmost important hence Raid 5 is what I would need but will require 3 hdd of smaller capacity for it & that I need on a different system where the data processing is happening not on the storage system as its just backing up.

My workflow will be as follows.
Transfer data in the field to a laptop
backup to a portable hdd from laptop
then backup from portable hdd to the main storage system 1TB disk.

if data security is of utmost important and you want to use two HDD's, nothing beats RAID 5. if you looking for a total of 3Tb storage, you can get 3x1Tb HDD's and put them in RAID 5.

R

I am confused!!!

To my understanding raid 5 will require 3 hdd & if I make raid with 1TB hdd (1TBx3) I will still get only 1TB of usable storage space......................is that correct?

R

accordin to wiki, totalstorage=S x {(n-1)/n}
where S = total size of all hdd
and n = no. of hdd
suppose each hdd is 1TB and n = 3
so your totalstorage = 3TB x {(3-1)/3} = 2TB

i think it is better to have hdd with equal capacity if possible

^^ It's a must to have HDD with equal capacity.

Yes. you need to have 3HDD's.

For better understanding of RAID 5, check this: *www.acnc.com/04_01_05.html

BTW, Do your homework before using RAID. It's a superb solution for data security and performance. You have to know what operations you can do on partitioning etc and what you should not.

Advantages of RAID 5:

# File and Application servers
# Database servers
# Web, E-mail, and News servers
# Intranet servers
# Most versatile RAID level

R

wont raid5 take the size of the smallest hdd in the array?

wikipedia said:
In case that the drives vary in capacity, the smallest of them sets the bar. Therefore, the usable capacity of a RAID 5 array is (N-1) x Smin, where N is the total number of drives in the array and Smin is the capacity of the smallest drive in the array..

*en.wikipedia.org/wiki/Standard_RAID_levels#RAID_5_usable_size

RAID 5 May Be Doomed in 2009? by tomshardware.com

Raid5 drawback

Drawbacks
----------------------------------------------
Distributed parity causes overhead on write operations. There is also overhead created when data is changed, because parity information must be located and then recalculated.

Disadvantages according to microsoft

billygates said:
Disadvantages of RAID-5 Volumes

In general, RAID-5 volumes are not well suited for any write intensive workload, since a single write is likely to generate a disk read of the parity and two writes (to update data and to parity).

A RAID-5 volume is not well suited for the following situations:
•

Where applications that require high-speed data collection from a process are used. This type of application requires continuous high-speed disk writes, which do not work well with the asymmetrical I/O balance inherent in RAID-5 volumes and the extra I/Os required to write the parity stripe.
•

In transaction processing database applications in which records are continually updated, such as in financial applications where balances are frequently updated.
•

Where applications that require large sequential data transfers are used. These types of data transfer can prevent effective I/O load balancing.

Neither the system volume nor boot volume can be on a RAID-5 volume. If a disk that is part of a RAID-5 volume fails, read operations for data stripes on that disk are substantially slower than for a single disk. The software has to read all of the other disks in the set to calculate the data.

A RAID-5 volume requires more system memory than a mirrored volume.

R

Bought this one today from nehru place

Seagate1.5tb hdd32mb buffer Rs 9000/-
ST31500341AS- *tinyurl.com/4ocovq

W

ranjan2001 said:
Bought this one today from nehru place

Seagate1.5tb hdd32mb buffer Rs 9000/-
ST31500341AS- *tinyurl.com/4ocovq

seems like a good price considering Seagate 500 gb 32mb is selling for 2990. Prices as of 5th nov '08.