[TriLUG] fdisk partition question

[Kevin Flanagan]

Chris,

	The 6402 is a good solid controller, IIRC, it has 128MB of cache.  I 
also believe that it has 2 channels, you could split the MSA 30 in half 
if you have 2 channels on it as well.


	Hot spare disks are per array, not logical drive, if you just made one 
big array, with 2 logical drives, you'll be fine with one hot spare.  I 
have had occasions where a disk goes out during the day, and I called at 
4PM, by the time I came in at 8 the next morning, the replacement was 
sitting there waiting for me.  That was just standard warranty service 
too.  Then again, I have had occasions where it took a good bit longer 
to get replacement parts to my location.  I think that disks should be a 
fairly safe bet, they have lots of spares for that common a part.

	So, you are booting from internal disks? If so, the internal disk would 
be /dev/cciss/c0d0p1 etc, and the MSA would most likely be 
/dev/cciss/c1d0p0 and c1d1p0

There is a possibility that what Jason mentioned is the case for the 
6402, I forget which drivers it uses, they could use the older ones, in 
that case it would be /dev/ida/c1d0p0 etc.



I sure hope that this isn't becoming more confusing that it started out.


Kevin







	

Chris Bullock wrote:
> I used the onboard controller for the OS partiton.  I used a HP 6402
> controller for the direct attached storage, that card has more circuitry
> than most workstations.  As far as using a hot spare, if we lose 1 disk I
> would hope that we could get a replacement before losing another one.  HP
> usually has us another disk within 24 hours, however I have been
> contemplating using a hot spare.  My question is that since the controller
> will not support a logical drive larger than 2TB must I have a hot spare
> for each logical drive.
> Thanks,
> Chris
> --- Kevin Flanagan <kevin at flanagannc.net> wrote:
> 
>>Chris,
>>
>>	It's like ARC boot, /dev/cciss/"Controller#,Drive#,Partition#"
>>
>>	The first disk should be /dev/cciss/c0d0p1 - px
>>
>>	The second one should be /dev/cciss/c0d1p1 - px
>>
>>
>>So, your RHEL installation most likely created file systems such as,
>>
>>/boot on /dev/cciss/c0d0p1 ~100MB
>>swap on /dev/cciss/c0d0p2
>>/ on /dev/cciss/c0d0p3
>>
>>
>>"fdisk /dev/cciss/c0d1" should let you create partition(s) on the second
>>
>>logical drive.
>>
>>
>>
>>Did you use the onboard RAID card in the DL380?  If so, it's not going 
>>to provide the best performance for such large file systems, it's really
>>
>>designed for booting from, and some fairly straight forward stuff like 
>>web content, where the OS will cache much of the content anyways. 
>>Another thing to think about is spare disks, if you didn't save one disk
>>
>>for a hot spare you might want to reconsider it, if you were to leave 
>>one disk out of the array you can make it be be the spare for as many 
>>arrays as there are on the one controller.
>>
>>
>>
>>
>>Hope this helps,
>>
>>
>>
>>	Kevin
>>
>>
>>Chris Bullock wrote:
>>
>>>I can't seem to get the manual fdisk partition thing down.  Got a new
>>
>>HP
>>
>>>DL360 with a direct attached HP MSA 30.  The DL360 has a RAID card
>>
>>that
>>
>>>limits the file size to 2TB.  The MSA 30 has 14 300GB scsi drives.  I
>>
>>have
>>
>>>configured the RAID controller to have 2 logical drives both with
>>
>>1.5TB
>>
>>>logical drives.  Installed RHEL and it will not let me create the
>>>partitions the size I want at install time.  This is what I need, I
>>
>>have
>>
>>>the OS on the RAID1 logical drive on the DL360.  The problem comes
>>
>>when I
>>
>>>try to fdisk the other direct attached storage.  First, how do I know
>>
>>what
>>
>>>to fdisk?  I know I need to start with /dev/cciss/?? but there are
>>
>>2052
>>
>>>possibilites after that. I would assume after I find what device I
>>
>>want to
>>
>>>fdisk, i would run fdisk /dev/cciss/$drive, then n for the new
>>
>>partition. 
>>
>>>after that I would assume to mkfs.ext3 and after that create a lable
>>
>>and
>>
>>>add it to fstab.  Any help would be appreciated, email or web link.
>>>Regards,
>>>Chris
>>>
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>>
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