Re: software raid

[Scott Silva <ssilva@xxxxxxxxxxxx>]

Feizhou spake the following on 3/29/2007 11:24 PM:
> 
>> On that note, what cheap add-in SATA controllers have folks had good
>> luck with?  I haven't tried *too* hard, but the couple I've tried were
>> far less than stable.
> 
> I have recently got a 4 eSATA port card based on the si3124 chipset.
> Unfortunately there is no support yet on the driver side for port
> multipliers so I have only used single drive eSATA cases. Seamless.
> However, this is not on Centos...at least not yet.
> 
> The one I got look almost like the one below save for the sticker on the
> chipset.
> 
> http://www.firewire-1394.com/esata-sata-ii-4-port-raid.htm
> 
>>
>> 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.

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