Software raid master slave

The really short story is: IDE drives are fast, although they are not as of this writing found in The RAID layer will mark the disk as failed, and if you are running RAID levels 1 or above, the machine should work just fine until you can take it down for maintenance. Not only would two disks ruin the performance, but the failure of a disk often guarantees the failure of the bus, and therefore the failure of all disks on that bus.

In a fault-tolerant RAID setup RAID levels 1,4,5 , the failure of one disk can be handled, but the failure of two disks the two disks on the bus that fails due to the failure of the one disk will render the array unusable.

Also, when the master drive on a bus fails, the slave or the IDE controller may get awfully confused. One bus, one drive, that's the rule. Considering the much lower price of IDE disks versus SCSI disks, an IDE disk array can often be a really nice solution if one can live with the relatively low number around 8 probably of disks one can attach to a typical system.

IDE has major cabling problems when it comes to large arrays. Even if you had enough PCI slots, it's unlikely that you could fit much more than 8 disks in a system and still get it running without data corruption caused by too long IDE cables. Furthermore, some of the newer IDE drives come with a restriction that they are only to be used a given number of hours per day. Although hot swapping of drives is supported to some extent, it is still not something one can do easily.

Promise says I shouldn't do that i. Is it not recommended solely because of the possibilty that if the master drive fails I won't be able to access the slave drive. IF that is the only reason, then I'm not worried since if that happens all I have to do is remove the failed drive and re-jumper the slave as a single and all my data will be there. On the other hand, if there is a risk of data corruption or the mirrored drive not having an identical image then I just need to set it up as two separate drives.

Any guidance? Joined Oct 22, Location Dallas, Texas. You must log in or register to reply here. Similar threads S. Raid 0 With 2 x nvme 4. Shizenhouzen Aug 18, Storage. Replies 17 Views 1K. Aug 27, gregmacknass. Replies 4 Views Aug 15, Mr. NAS used as a normal computing drive - benefits? Failure tolerance is more important than speed. After booting up the system please check that the Adapter you are going to use is correctly found.

But you see the controller in the dmesg message? First, maybe natacontrol doesn't find them because the ata channel is not attached. So attach it first!