couple of quickies

cosine_ · n00b Joined: 03 Sep 2004 Posts: 20

two quick questions.

#1: i installed gentoo about 2 months ago, but never really understood the cdrom part. I have two cdroms in the box but only one shows up in kde. im assuming its just adding it to fstab, that correct?

#2: i picked up 4 200gb hds recently (found a good deal) so ive stuck em in there with a Promise Ultra133 Tx2 card. at the moment, i have everything installed and the drives all hooked up. im running on 2.4 kernel (was tipped off that promise cards dont work with 2.6.x) and added pdc202xx_new to the modules to load (taken from https://forums.gentoo.org/viewtopic.php?t=206911&highlight=promise+raid) i THINK the drives are showing up correctly, in kde under /dev/ i have hda-k (hda is my boot/root/swap e/f are the cdroms and the last 4 are the drives attached to the promise card. im guessing thats them, since the location is /ide/host4/bus0/.... blah blah) hda1-3 (boot/root/swap). my question is this. I know somewhere i have to setup the raid, how do i do that? would it be done with fdisk? i found some info at https://forums.gentoo.org/viewtopic.php?t=68706&highlight=promise+raid but wasnt sure if thats what it was im looking to do. basically i want to raid the drives into two pairs (400gb for each raid). im assuming thatd be raid0, but since this is my first experience with raid im not positive.

thanx for any help.

Lajasha · Posted: Thu Oct 28, 2004 8:43 pm Post subject: Re: couple of quickies

cosine_ · n00b Joined: 03 Sep 2004 Posts: 20

software raid*

Lajasha · Posted: Thu Oct 28, 2004 10:20 pm Post subject:

I don't believe the kernel will do a Raid 0+1, if i recall correctly it will do 0,1,4/5. If you want to go with raid 0+1 or 5 I would suggest trying your controller card are picking up one that does it, as you will probly spend alot of CPU time on raid5
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pjp · Administrator Joined: 16 Apr 2002 Posts: 20067

Moved from Installing Gentoo.
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cosine_ · n00b Joined: 03 Sep 2004 Posts: 20

in case it helps. booting from the livecd and typing "fdisk -l" shows me that all the drives are there and properly identified. just that they arent formated to anything.

ewan.paton · Posted: Fri Oct 29, 2004 4:13 am Post subject:

you really want a software raid then you can stripe data over 4 disks and mirror 2, its a lot more flexable and you just need to setup the partitions right, i mean do you really need to waste 200gigs mirroring your data and ide hardware raids just pass the load to the processor in most cases anyway
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cosine_ · n00b Joined: 03 Sep 2004 Posts: 20

mmkay. so ive learned some more and am back.

i kno i need software raid0. the big quesiton for me now is, is it worth it to do it if the two drives id be raiding would be on the same ide channel as master and slave? how much of a performance hit is that?

cosine_ · n00b Joined: 03 Sep 2004 Posts: 20

found out the performance is pretty bad. so im just gonna format em reguarly.

thanx for the help ppl who responded.

Lajasha · Posted: Sun Oct 31, 2004 2:04 pm Post subject:

Yea a Stripe will show the best stats when each HD in it is on its own channel, kinda pointless other wise.
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