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md4 : active (auto-read-only) raid5 sda5[0] sdd5[4] sdc5[2] sdb5[1] 1536 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_] It says right there - it's in read-only mode. Switch it to read-write mode: mdadm --readwrite /dev/md4 By the way, this isn't a large array. It's a tiny slice of your 4TB disks. Bit of a wacky setup as well, if ...


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Checking a RAID1 still makes sense, and doing it on a regular basis should keep your data significantly safer. This seems counterintuitive, until you dig deeper into how drives tend to fail. I agree that if the two disks are out of sync, that the checking won't do any good. But what if one of the disks has a sector that has recently failed? Well, reading ...


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This is related to read-ahead. Rotating drives suffer from an extremely slow access access time, so you want to minimize access time and read sequentially as much as possible. To achieve this, Linux use a default 128KB read-ahead value, which mean that every time you request a 1KB block, 128KB would actually be read and cached. Check your read-ahead ...



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