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тАО02-03-2005 03:29 PM
тАО02-03-2005 03:29 PM
lv mirror on 2 campus
I do not understand this problem.
I have one lv (name lvidx) it is mirrored from 2 pv (c16t0d0 and c12t0d0). C16t0d0 is located at one campus and the other is located at another campus.
My question: Wheren one pv is broken (such as power off VA) how do my lv work? I think it try to write on both pv so that writing speed will be slower than normal status. another person say lv can detect failure pv. it will not write failure anymore if pv is broken.
Can anyone give me the offical doc about this topic. Any comment will be highly appreciate
thank.
tienna
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тАО02-03-2005 05:26 PM
тАО02-03-2005 05:26 PM
Re: lv mirror on 2 campus
If one of your pv is broke (assume c16t0d0)then replace the disk, copy the data from c12t0d0.
If any one PV breaks you get the error in system log (/var/adm/sw/syslog.log)
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тАО02-03-2005 06:40 PM
тАО02-03-2005 06:40 PM
Re: lv mirror on 2 campus
You may misunderstand. I want to ask how do my lv work? (whether it stop to write on failue pv or retry to write on this pv when this pv is fail.)
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тАО02-03-2005 06:58 PM
тАО02-03-2005 06:58 PM
Re: lv mirror on 2 campus
How you have created mirror,
if you have created mirror from c16t0d0 to c12t0d0, inthis case if c16t0d0 fails, writing on both pv stops, if c12t0d0 fails, data will be written to c16t0d0 but not to c12t0d0.
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тАО02-03-2005 07:09 PM
тАО02-03-2005 07:09 PM
Re: lv mirror on 2 campus
Then the disk comes back online there will be stale extents which will update over a period of time.
If you replace a disk that has failed then you have to redo the mirroring from scratch.
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Owner of ISN Corporation
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тАО02-03-2005 08:17 PM
тАО02-03-2005 08:17 PM
Re: lv mirror on 2 campus
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тАО02-03-2005 08:21 PM
тАО02-03-2005 08:21 PM
Re: lv mirror on 2 campus
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тАО02-03-2005 08:45 PM
тАО02-03-2005 08:45 PM
Re: lv mirror on 2 campus
I can not understand myselfs why my system was slow at that time (failure time). Syslog only display 2 error message on failure pv.
Any offical doc is recommand.
tienna
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тАО02-03-2005 09:07 PM
тАО02-03-2005 09:07 PM
Re: lv mirror on 2 campus
When you miss one disk from mirror there little time out.
After that system work with normal speed only with good disk.
Also do not reboot with one connected disk :) or you probably need one more reboot :))
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тАО02-04-2005 05:21 PM
тАО02-04-2005 05:21 PM