Linked by Eugenia Loli-Queru on Mon 26th May 2003 23:36 UTC
Linux only has a small percentage of the computing market, however Microsoft already considers it a major competition as the open source OS steals the hearts of many users. Following the hard numbers though, Microsoft also increases its market share on both server and desktop space with time. The only logical explanation is that Linux steals quite a market share from the traditional UNIX providers (SCO, Sun, SGI, HP, IBM). But only Sun seems to truly be in a real Linux trouble, as it is the one with a resistance to Linux integration to its full product range.
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Yesterday and today I played with the software Raid controls of SuSE Linux, and after this I understand you might be better off with a commercial Unix like Solaris.
I have SuSE 8.2. I needed more space for the home directory, but my partition layout did not permit this (physically /boot; /home; /; free space). So I moved all of /home onto /, then created a new partition in the free space (2.5 of 5 GB) and then used YaST to create a RAID array of the old /home and the new partition. This went all right, I copied all data to the new, 3.4 GB /home again.
But then I thought, well, why not add another partition of 2.5 GB, and while I was at it, remove the 2.5 gb one and replace it with a 5 GB one. So I started Yast, but it complained that it could not modify any existing RAID arrays.
So, I tried raidhotremove, but I did not manage to produce the right syntax and it does not have a manpage. Therefore I used raidreconfigure to remove the 2.5 gb partition (all data would still fit on the 900 MB one) but it failed and all data from /home was lost.
Apart from that I have most data on my Windows partition and OpenOffice now works again, this experience is not what I would expect from a system to be used in professional environments. To conclude, what would I expect:
1) Convert two regular partitions to a RAID volume (if possible without data loss)
2) Shrink and enlarge one of the RAID partitions
3) Add and remove Raid disks
4) Ideally this should all be possible while running, thus without any downtime, at least point 3 and I guess point 2 too, point 1 will be difficult.
Btw. I am talking about RAID 0 here, thus just concatenating two partitions together to one big one.