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тАО08-04-2004 12:20 AM
тАО08-04-2004 12:20 AM
1. Can I mirror disks across the two enclosures?
2. Supposing the above is possible would it be regarded as best practice to do this.
Thanks in advance
Solved! Go to Solution.
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тАО08-04-2004 12:51 AM
тАО08-04-2004 12:51 AM
Re: MSA1000 & MSA30
1.) Yes, of course! I have just set up two MSA1000 with MSA30 this way.
2.) I put the mirrors in different enclosures (e.g. I mirror between Bus:0 and Bus:2 or 1/3).
Please notice that the MSA1000 needs firmware revision 4.32 to support the MSA30.
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тАО08-04-2004 11:43 AM
тАО08-04-2004 11:43 AM
SolutionThe MSA1000 is a Fibre Channel-connected RAID unit. The base unit has some drive slots, and you can expand to additional enclosures (which it sounds like you are doing). The additional enclosures are the MSA30 (formerly the 4300-series enclosures).
So, it's not like you are connecting two separate storage units to your hosts, these two units blend into one RAID storage unit that just ends up being the MSA1000. The MSA30 is just more storage bays for the MSA1000.
As Uwe says, you can pick and choose how you mirror your drives in the raid box, or you can do some mirrored drives (across chassis), plus some drives that are just a raid-5 set for less critical data. Everybody has less critical and more critical data, but it's not always easy to identify or split up. Just a thought.
Anyway, the MSA1000 is a nice little entry Fibre Channel array that I think you'll be happy with. Get to know it, but don't share your coffee with it.
Regards, --bmr
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тАО08-04-2004 05:42 PM
тАО08-04-2004 05:42 PM
Re: MSA1000 & MSA30
a minor correction, if you allow. The MSA30 is the new name for the M44xx enclosure series. The M43xx is Ultra-3/U160 - the M44xx/MSA30 is U320. Speed-wise it doesn't matter has the controllers are U3.
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тАО08-04-2004 06:09 PM
тАО08-04-2004 06:09 PM
Re: MSA1000 & MSA30
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тАО08-04-2004 06:27 PM
тАО08-04-2004 06:27 PM
Re: MSA1000 & MSA30
""Interface Ultra3 SCSI to Hard Drives""
--
http://h18004.www1.hp.com/products/servers/proliantstorage/sharedstorage/sacluster/msa30/index.html
""The HP Modular Smart Array 30 Enclosure family is the newest HP Ultra320 SCSI disk drive storage enclosure, ...""
--
It is not a problem, because the U320 SCSI disk drives will negotiate down to the controller's speed. Just remember, as I already wrote, to make sure you have firmware V4.32 to support the MSA30:
http://h18000.www1.hp.com/products/storageworks/softwaredrivers/msa1000/msa1k_intel.html
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тАО08-05-2004 05:54 PM
тАО08-05-2004 05:54 PM
Re: MSA1000 & MSA30
Incidentally, Ultra160 (160MB/s theoretical, 100-120MB/s normal/sustained) is roughly the same speed as the original 1Gb Fibre Channel, which did back-end I/O to the disks in lots of storage arrays for a couple of years after 2Gb Fibre Channel started being used on the host side.
For a cheap, entry-level array, this little MSA is not bad, not bad at all. I used to hold a grudge against them because they didn't support HP-UX. It was the last OS that they brought on-board (bizarre, just bizarre... a little passive resistance by the CPQ holdouts, I always imagined?). They finally added it to the list, however, so... now I can like the MSA units. Lovely price, decent performance and manageability. Perfect for the many small shops that I help out from time to time.
Regards, --bmr
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тАО08-05-2004 07:01 PM
тАО08-05-2004 07:01 PM
Re: MSA1000 & MSA30
- special firmware
- single path only