[CentOS] Re: software raid
feizhou at graffiti.net
Sat Mar 31 00:43:09 UTC 2007
>>> There is one advantage of hardware RAID that hasn't been mentioned
>>> yet, and that's hot-swap. Last time I tried, software RAID fell over
>>> when a HDD suddenly disappeared.
>> Did you just pull the thing out? I believe there was supposed to be some
>> mark down procedure before you actually pull the disk out.
>> Besides, it sounds weird...isn't the disk disappearing when it dies more
>> or less the same?
>> I will be testing yanking out a drive on my box. I will let you know how
>> it goes.
> It is the breaking of electrical connections that it trips on. Even if a drive
> fails, it is still commected, and the system can ignore it. AFAIR you can't
> hot swap a regular SCSI drive either.
I don't try yanking non hot-swap drives. I watched a guy try to connect
an IDE cable while the box was on and on his lap. He got an electric
Anyway, a pull power plug and a pull eSATA cable test both resulted in
the expected degradation of mirror. Plugging in power or eSATA cable and
then bringing the disk back online worked as expected. Open Solaris
No echo > /proc special knowledge needed either.
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