comparision ata and sata and pata and fata

[???_185]

I am so confusing by many kind of disk type.
coulud you explain these disk type definition.

[Steven Clementi · Accepted solution]

ATA stands for Advanced Technology Attachment

ATA - The standard PC Hard drive interface that has been around for years (IDE)

SATA - Serial ATA is a newer PC Hard drive interface that is quickly taking over the "ATA" stronghold. SATA is faster than ATA and runs at about 150MB/s. SATA-II, which was recently announced, runs at 300MB/s.

PATA - Parallel ATA is the same as ATA or IDE. The old standard for connecting Hard Drives (40 pin connector)

FATA - FATA is a Fibre connectted ATA drive. Usable on systems that have a Fibre based backplane ( the EVA for instance).


Steven

[Ivan Ferreira]

FATA disks are alternatives to Fibre Channel (FC) disks:

http://www.hp.com/hpinfo/newsroom/press/2005/050725a.html

[Ted Buis]

All xATA drive are lower performance and low duty cycle compared to SCSI, FC or SAS drives. For server use, I would recommend SCSI, FC or SAS drives. FATA performs better than the other xATA drives but it is still for a much lower duty cycle. If you bang on the xATA drive too much you will have a much higher failure rate. But for write once read never (or rarely) and never change applications such a storing images for low use record retention, the FATA and SATA drives lower price could be very attractive.

[Mike Reznak]

Hi,

just to add something to Ted's answer from real life.

We're experiencing most of the drive failures on EVA mostly on 250GB FATA. It's not really designed for 24/7 operations, so we are planning some data migration to avoid heavy and constant load on that group.

Mike

[Edgar_8]

Hi Mike,

Its interesting reading your comments regarding the EVA FATA 250GB drive failures, because we are experiencing the same where we are having continous drive failures on a reqular basis. Are you replacing your EVA FATA 250GB drives and if so with what?

[Darius Rudzika]

Here's the HP whitepaper "HP StorageWorks Enterprise Virtual Array (EVA) Storage Solutions: High-Performance and Low-Cost Disk Drives" which has quite broad overview of disk technologies and pros/cons for each of them.

ftp://ftp.compaq.com/pub/products/storageworks/whitepapers/5982-7353EN.pdf

br,
Darius

[Mike Reznak]

Edgar,
since some EVAs are under waranty period and we have support agreement, we keep replacing failed disks for new ones. We think of reconfiguring VDISK layout, so that mostly archive and low load servers will use space on FATA.
But another issue is cloning to this group.
Which generates fairly high activity through leveling.
HP support says, that we should upgrade to VCS 3.028 (currently we have 3.025) together with latest disk fw (we are two versions back). That might solve part of the problem. What versions you have?

Mike