Hi all, I'm on about the Compaq Proliant's again.
I'm (hopefully) going to end up with 6 9GB Hot-Plug Untra2 SCSI disks on an Integrated Dual Channel Wide-Ultra SCSI-3 Controller. This will not provide H/w raid, so I'm looking at doing it in s/w. I seem to remember a thread a while back about there being a problem with putting /usr on a raid device as /usr is needed to provide raid and there creates a catch-22 situation. This surely creates a single-point-of-failure which reduces the effect of raid. My questions therefore are: 1) I intended to use striping (raid 5?) over the six disks. Am I right in thinking that this improves performance by spreading the workload more evenly over the disks? If one of the drives fails, I understand the system will carry on but generate warnings. Is the S/w raid in Linux good enough to let me swap out and rebuild the disk without loss of service? 2) If I use mirroring (raid 0?) for /usr, could it boot up using one of the mirrors without the raid s/w and then once /usr and raid is available then turn on the mirroring? If the 1st mirror then failed, could I carry on using the second mirror without system loss and be able to swap out and rebuild the faulty disk? 3) Can I mix raid devices on the same physical devices. For example can I mirror 4GB of the 1st two disks and stripe everything else? If the disks used for striping all need to be the same geometry then presumably this won't work. Could I then mirror the first two disks and stripe the other 4? 4) Can anyone suggest better alternatives? 5) Can anyone suggest some good (read simple) Raid documentation I could read? Sorry for such vagueness but Raid is totally new to me - as you can see I'm not even sure of the terminology. -- Gary Stainburn This email does not contain private or confidential material as it may be snooped on by interested government parties for unknown and undisclosed purposes - Regulation of Investigatory Powers Act, 2000 _______________________________________________ Redhat-list mailing list [EMAIL PROTECTED] https://listman.redhat.com/mailman/listinfo/redhat-list
