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The Thursday 2007-09-20 at 19:37 -0400, Felix Miata wrote:
> Additional safety of more disks unless using RAID is an illusion, and then
> with RAID you're right back to the limit of 14. To get 28 and safety means
> you need 4 disks: 2 for each set of 14 partitions, and matching devices for
> the RAID1. Now with 4 disks you have 4 times the opportunity for hardware
> failure, and 4 times the cost.
I think we might do something: use two disks in software raid
configuration. Perhaps some non raid partitions (/boot?), then a big raid
partition having the rest of the disk. This would appear as /dev/md0.
Now, md0 can be partitioned. From
/usr/src/linux/Documentation/devices.txt:
9 block Metadisk (RAID) devices
0 = /dev/md0 First metadisk group
1 = /dev/md1 Second metadisk group
...
Here, the minor represents the device. I'm not sure how would partitions
inside appear. I know it can be partitioned because fdisk says so:
] nimrodel:~ # fdisk /dev/md0
] Device contains neither a valid DOS partition table, nor Sun, SGI or OSF
disklabel
] Building a new DOS disklabel. Changes will remain in memory only,
] until you decide to write them. After that, of course, the previous
] content won't be recoverable.
]
]
] The number of cylinders for this disk is set to 781136.
] There is nothing wrong with that, but this is larger than 1024,
] and could in certain setups cause problems with:
] 1) software that runs at boot time (e.g., old versions of LILO)
] 2) booting and partitioning software from other OSs
] (e.g., DOS FDISK, OS/2 FDISK)
] Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
I haven't tried it, not further that point. It is not ideal, of course,
but... :-? might work?
Of course, you can use a degraded raid of only one side, ie, one disk.
> 30 takes 3 devices, because 15 is only the name of the last device, not the
> count, which is 14, because on sd[1-4] only 3 can have filesystems.
Ouch. I hadn't noticed that "detail". We usually don't count the extended
partition. Of course, we can only use partition 1..15, of which one of
them is not writeable.
- --
Cheers,
Carlos E. R.
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