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тАО03-29-2006 07:07 PM
тАО03-29-2006 07:07 PM
Mixed speed disks on MSA1000
Is it safe to expect the same? Or, would I lower the overall performance of the storage device by putting "slower" bus drives in there (Ultra2's/3's - but in their own Array(s) probably).
Regards,
Paul
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тАО03-29-2006 08:40 PM
тАО03-29-2006 08:40 PM
Re: Mixed speed disks on MSA1000
I recommend that you config all same disk or same speed to once array. do not spread to others disk
HTH
tienna
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тАО03-29-2006 09:01 PM
тАО03-29-2006 09:01 PM
Re: Mixed speed disks on MSA1000
In other words, with a 36Gb Ultra3 drive in each of bays 1 & 8 configured as Array A, and two 36Gb Ultra2 disks in bays 2 & 9 configured as Array B, does the Bus speed of the disks in Array B affect the bus speed of the disks in Array A?
If I configure all four disks in a single Array, then I know it would slow them all down.
Paul
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тАО03-29-2006 09:02 PM
тАО03-29-2006 09:02 PM
Re: Mixed speed disks on MSA1000
But another concern is about whether to mix or not HDDs with different interfaces (e.g. U160 & U320) on the same SCSI bus. You could have many RAID arrays sharing the same bus, which will perform with the speed of the slowest drive connected to that bus.
First of all the MSA1000 has U160 backpanel interface, which means it makes no difference at all whether you have U160 or U320 speed from your entire MSA30 enclosure - it will be downgraded to U160 anyway.
If you have any drives slower than U160 (e.g. Ultra2) then the best thing to do is to keep them in a separate MSA30.
Regards,
Radek
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тАО03-29-2006 09:07 PM
тАО03-29-2006 09:07 PM
Re: Mixed speed disks on MSA1000
Is this definite though? If the 4314 is documented as supporting all devices at their standard interface speed, then it's surprising that a "flagship" device within a similar range doesn't have the same facility?
I'm just trying to make sure that "the best thing to do" isn't just based on traditional SCSI architecture when the newer architecture doesn't have such limitations.
Paul
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тАО03-29-2006 09:16 PM
тАО03-29-2006 09:16 PM
Re: Mixed speed disks on MSA1000
The above also applies to the MSA1000 / MSA30.
Basically parallel SCSI interface remained unchanged for years - what we have seen were rather speed bumps that any key architectural breakthroughs.
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тАО03-29-2006 09:36 PM
тАО03-29-2006 09:36 PM
Re: Mixed speed disks on MSA1000
Oh well, useful to know...
Actually, how about keeping different speeds on different "halves" of the storage unit? Doesn't it have two buses internally?
So, Ultra3 in bays 1-7, Ultra2 in 8-14 etc. would that make a difference?
Paul
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тАО03-29-2006 09:45 PM
тАО03-29-2006 09:45 PM
Re: Mixed speed disks on MSA1000
"The dual bus I/O module allows two SCSI channels to access a single MSA30. This allows for greater fault tolerance (controller duplexing) or provides access from two different servers to two separate storage areas."
But for me it is still not rock solid whether the two halves of MSA30 are on separate SCSI buses & can operate with different speeds, or not.
Can anyone confirm that?
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тАО03-30-2006 05:05 AM
тАО03-30-2006 05:05 AM
Re: Mixed speed disks on MSA1000
It is not always true that 'all drives will run at the slowest "bus speed"'.
The devices are free to individually negotiate different speeds and use them - that's true for most if not all devices inherited from Compa's / DEC's storage groups.
I have been told that (at least) some initiators from pre-merger HP storage choose to run at the speed of the slowest device, but, again: that is not true of all devices from different vendors.
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тАО03-30-2006 07:36 PM
тАО03-30-2006 07:36 PM
Re: Mixed speed disks on MSA1000
Can you (or anyone else) suggest any useful reading from HP?
(Appreciate the input!)
Paul