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тАО01-29-2008 07:31 PM
тАО01-29-2008 07:31 PM
HSG80 ema failed disk replacement
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тАО01-30-2008 09:50 AM
тАО01-30-2008 09:50 AM
Re: HSG80 ema failed disk replacement
The idea of a mirror set is that you choose to never allow two members of the same set to be on the same channel if at all possible. For instance, for my ESA, the mirror sets are shift one row AND one column from each other. So DGA1 (mirror set M1) is defined based on DISK10000 and DISK20100. That way, you never lose the mirror.
I concur with the practice of mucking about using the FAILEDSET and SPARESET as ways to reconstitute mirror members on-line.
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тАО01-30-2008 10:50 AM
тАО01-30-2008 10:50 AM
Re: HSG80 ema failed disk replacement
> set M1 nopolicy
> set M1 membership=3
> set M1 replace=DISK20100
> set M1 policy=best_performance
wait until the copying to DISK20100 has finished
> reduce DISK20000
> add spareset DISK20000 (or whatever...)
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тАО01-30-2008 06:22 PM
тАО01-30-2008 06:22 PM
Re: HSG80 ema failed disk replacement
Ideally you have another drive you can add to the mirror until there is a time that a stalled transaction won't be an issue, if you have a spareset, this may have already been done. Delete the drive from the failed set, then press the button, wait for the lights to flash, pull the drive and if you can replace quickly, put the replacement drive back in. That's what the button is for. Can you get away without using it? Most of the time the controller will detect the event and retry the operations, it will probably complain about an unexpected event on the bus. I've replaced a drive without quiescing the bus, but it wasn't intentional, it was carelessness, but I was replacing the drive at a low activity time, so perhaps I was lucky.
As far as the question about how quiescing the bus affects the production data flow, I can't say, since I never had activity going on that I was attempting to measure. If there are other devices on the channel that is being quiesced, that by definition is stalling all i/o to devices on that channel, so at least for cases where there is a JBOD device that isn't part of a raid1 or raid5 set, a read is done to that device, and the data does not exist in the HSG80 cache, I can see no possibility but to stall that I/O. It is less clear what will happen if the I/O was to a mirrorset where other members were available, writeback cache was available and enabled for the virtual unit. It that case, then I/O theoretically would not have to be stalled. But I don't know how the HSG80 firmware handles that case, and I don't have one to test on.
Uwe, do you know the answer to the original questions?
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тАО01-30-2008 10:08 PM
тАО01-30-2008 10:08 PM
Re: HSG80 ema failed disk replacement
thanks again!
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тАО01-30-2008 10:33 PM
тАО01-30-2008 10:33 PM
Re: HSG80 ema failed disk replacement
I doubt that the HSx controllers are more likely to have problems than MSA or Smart Arrays when you just pull a device or put in a new one. Perhaps the HSx controllers are just engineered better to allow you to do it with risk closer to zero by stopping the activity on the bus.
Is it ok to plug a flat tire? Many people do so without any problems and use that as a permanent fix, yet some people would never consider it. It depends a bit on what your perspective of what acceptable risk is.
Some people will never plug a SCSI device into an unused (non-shared) SCSI controller while power is on. That is probably best practice, but I do just that when I need to change a SCSI tape drive, and I can't shut the system down. I suppose there is a small chance that it could cause a hardware problem or conceivably even a system crash, although I have never had a problem. I do use antistatic straps when I do it, and I do have the tape drive powered off, but it still isn't "best practice".
Uwe is in a much better position than me to talk about what the risks are.
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тАО01-31-2008 12:52 AM
тАО01-31-2008 12:52 AM
Re: HSG80 ema failed disk replacement
Hope it helps.
Rob.
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тАО02-06-2008 02:21 AM
тАО02-06-2008 02:21 AM
Re: HSG80 ema failed disk replacement
I agree with Jon Pinkley: always sqeesz the I/O channel containing that drive and remove the drive.
But I do not agree with Jon
"if you can replace quickly, put the replacement drive back in"
If you do this and the HSG controllers are quit bussy they sometimes don't recognice the new disk and you have to do a remove/insert for a second time. So I always do this in 2 steps and 2 times a squeesz of the I/O channel.First step to remove the old one, second step to place a new one.
By the way we have at least one spare on each shelf and never place raid1 or raid 5 members on the same shelf. With policy best_performance the auto replacement toke never a spare from a shelf where already another member is on.
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тАО02-06-2008 12:15 PM
тАО02-06-2008 12:15 PM
Re: HSG80 ema failed disk replacement
So I agree with Ruud Dijt, do it twice, once to remove, once to add. I know that works.
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тАО02-07-2008 12:48 AM
тАО02-07-2008 12:48 AM
Re: HSG80 ema failed disk replacement
So, you should NEVER try and swap the disk as quickly as possible, in a single movement.
Rob.