Scsi Hdd


 
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# 1  
Old 07-08-2008
Scsi Hdd

i read the reply at this link
https://www.unix.com/unix-dummies-que...d-backups.html
and i really surprised and i want to know if it must the mirrored HDD be on the secondary SCSI port and the operated HDD on Primary SCSI port?
thanks
# 2  
Old 07-09-2008
I didn't read anything about SCSI channels/ports in that post. It depends on the raid controller and OS, I think. Usually the raid controller software or raid software from the OS just ask which is disk 1 and which is disk 2 to setup let's say a Raid 1.

On AIX it doesn't matter if you got both mirrored disks connected on one channel or on 2 channels or on 2 channels where each one is on a different controller, while the last option might be the safest. So if one of your controller dies, you still have the other controller with the other mirror disk.
# 3  
Old 07-09-2008
I mean this part

Disasters come in two forms: Hardware failures and operator errors.

Mirroring is the ideal backup for hardware failures, while tapes are the ideal backup for operator errors.


If a hard drive goes down, the mirrored drive takes over. Often, depending on the hardware, the bad drive can be replaced without taking the system down.

This happened to me at my last job. I got a red light on one of the drives. Called IBM and they sent a new drive overnight, with instuctions to simply remove the old drive, 'wait a minute', and insert the new drive.

The only part that surprised me was that I expected to have to issue some type of console command or something. But, no. A few seconds after the new drive was installed, the lights started blinking like crazy as it copied all the data to make it a good mirror. About an hour later, normal blinking resumed.

The important thing was, users never even knew there was a problem.


Tapes provide historical data.

If someone deletes a file, or does some other equally stupid thing, a mirror is no help since that copy will also be bad.
# 4  
Old 07-09-2008
I don't understand why you post a post from the post you are referring to in your first post. I don't see any answer or new info in that...
 
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