They all involve the isw driver. Cheers, Jes Comment 6 Jeff Gustafson Used now “halt” instead of “poweroff” to eye-copy last lines to here: The reconstruction process is transparent, so you can actually use the device even though the mirror is currently under reconstruction. If the writes are small and scattered all over the array, the RAID layer will almost always need to read in all the untouched chunks from each stripe that is written to, in order to calculate the parity chunk. With the latest mdadm, version 1.

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Add an attachment proposed patch, testcase, etc. Of Course, if the wrong disk breaks while the extgact is running, you’re out of luck. Note that ext3 no longer exists in the kernel – it has been subsumed into the ext4 driver, although ext3 filesystems can still be created and used.

linux – Gentoo XEN host + EFI + MDADM + IMSM RAID5 – Unix & Linux Stack Exchange

The configuration was hopefully stored on the RAID controller. Growshrink or otherwise reshape an array in some way. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


This inconsistency is for legacy reasons, and is not well-documented. Normal operation just uses the ‘Create’, ‘Assemble’ and ‘Monitor’ commands – the rest come in handy when you’re messing with your array; typically fixing it or changing it. Comment 41 rhbug Comment 12 Peter Bieringer You can never write completely parallel to a set of disks.

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Views Page Discussion View source History. I also found https: Normalno resync was triggered.

Starting with Linux kernel v2. Any hints where I can add a “sleep” to create some idle time or a check until “Dirty State” is “clean” before finally reboot? This affects RAID-5 performance. This exttract space is used for parity extrqct information. The load caused by disk activity at the block group beginnings spreads over all disks. As always, you may want to experiment with this or check out our Performance page. This also creates a container that is managed similar to DDF.

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Please see options for mke2fs for an example and details. I tested it before posting it here. Comment 44 rhbug Extrct will impose extra extractt and latency due to extra reads.


What mdmon look like if you do ‘ps -aux grep mdmon’ post boot? With a raid using a chunk size of 4k also called stride-sizeand filesystem using a block size of 4k, each block occupies one stride. It seems we have some progress on XEN side. When a chunk is written on a RAID-5 array, the corresponding parity chunk must be updated as well.

There are special options available when formatting RAID-4 or -5 devices with mke2fs or mkfs. To change the metadata version the default is now version 1. If the device was successfully created, the reconstruction process has now begun. The examples above get this right. Home Questions Tags Users Unanswered. exttact

This allows the kernel to read the configuration of RAID devices directly from the disks involved, instead of reading from some configuration file that may not be available at all times.