Re: Raid by software under SuSE 7.1 or 7.2 ?
Hi, Christian, Can you please share your wise experience and tell us which hot-swap enclosures you are using and how you manage to swap drives on the OS side? Thanks in advance. ******************************************************** * Best Regards --- Andrei Verovski * * e-mail --- andrei.verovski@bigfoot.com * * * * Personal Home Page * * http://homepage.mac.com/macgurutemple/ * * Mac, Linux, DTP, Development, IT WEB Site * ********************************************************
re all, well, im not using a hot-swap capable scsi-controller, therefore i have no real hot-swap enclosure. only the power supply is redundant and hot-swap capable. what i have done is to give an extra disk as spare drive to the raid array, it comes into play if one of the other drives in the raid-array fail. this mechanism works fine, i have tested it by unplugging the power from one of the raid drives. all the drives live together with a 50gb streamer in a standard 8-slot 19" drive-case wirh redundant power supply. there are a lot of things changed in the raid code, for example the array always comes up immediatly, no longer need for a explicit raid-check which took a lot of time before. all the resync stuff is done in the background. a perferct combination together with a reiser filesystem. only swap cannot be made on a raid array, this can cause a deadlock of the system (according to the docs....) with previous versions of the raid code it was a bad idea to have a reiser fs on a raid array. this was due to some buggy buffer handling in the raid code (and maybe in the reiser code ?) which confused booth, raid and reiser, and made alot of trouble after it was running for a while. (the buffer regions conflicted between these two pieces) but that is now solved. also the stuff with the spare drives is (in its working version) new to the raid code. as i have said in the previous mail, we have a raid-5 running on a production server and it performs really good. the drives are hooked to one of the two uw-scsi-160 bus (which are onboard for me) the write/read performance is higher on the array than on a single disk, though i have not made a real benchmark on this, simply writing/reading a 1 gbyte file with dd from /dev/zero . its about (a little) more than twice as fast as single scsi drive. im sure that with a hot-swap capable scsi controller it should be possible to get a real comfort if a drive fails, but the "spare drive solution" does ok if you have a normal controller with no hot-swap. hope that was informative, chris Am Freitag, 6. Juli 2001 09:40 schrieb Andrei Verovski:
Hi, Christian,
Can you please share your wise experience and tell us which hot-swap enclosures you are using and how you manage to swap drives on the OS side?
Thanks in advance.
******************************************************** * Best Regards --- Andrei Verovski * * e-mail --- andrei.verovski@bigfoot.com * * * * Personal Home Page * * http://homepage.mac.com/macgurutemple/ * * Mac, Linux, DTP, Development, IT WEB Site * ********************************************************
-- visit me at http://mamalala.de
participants (2)
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Andrei Verovski
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Christian Klippel