Marc A. Volovic wrote: > Quoth Lionel Elie Mamane: > > 1. Am very unfond of doing raid ops on main processor. > Hmm. Ok. I cannot argue with *you* being unfond of it. To me it is a simple matter of budget trade offs. > 2. in case of drive failure, recovery process is a pain > Well, doing "sfdisk -l /dev/sda > partitions" in advance, and then doing "sfdisk /dev/sdb < partitions" isn't all that hard, really. > 3. in case of device move, reintegration of volume is also a pain and may > lead to data loss > Not if you configure MD properly. Properly configured, it finds the partitions based on GUID, which means that a move is a no-brainer. > 4. lower performance than any hardware raid > ANY hardware raid? You obviously have not seen some of the shitty stuff that floats around.
A RAID controller that will have almost not buffers. A controller that will restart resync in the middle if the drive is being accessed too much. Some RAID controllers plainly suck, and MD will be MUCH better performer than those. In Ira's example, I can think of no configuration under which the crummy HostRAID that comes with the IBM xSeries 346 would be a better performer than MD. If you take a GOOD raid controller, MD will have poorer performance, but then it's really a question of budget, isn't it? > 5. no safte support > http://oss.metaparadigm.com/safte-monitor/ In your defense I'll state that I didn't know what safte was until you raised the point. Thanks for enlightening me :-) > there's more, but is enough > I do believe you are either biased or always buying from someone else's pocket. Either way, all the above do not relate to my situation. I'll also point out that software RAID is not without its own drawbacks. The most obvious is that hot plugging a replacement HD does require you to perform a manual operation to start recovery under HW raid. There is also the point that you can only boot from RAID-1 devices. On the other hand, it also has some nice things about it, the most obvious being that you can use different partitions on the disk at different RAID levels. As I stated above, it's all a question of budget and trade offs. Shachar -- Shachar Shemesh Lingnu Open Source Consulting ltd. Have you backed up today's work? http://www.lingnu.com/backup.html ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
