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Questions tagged [raid1]

RAID 1 or Mirrored RAID uses two or more disks that store the same data.

RAID Level 1 or mirrored RAID uses two or more disks that store the same data. One disk is mirrored to the other. Write speeds are the same as using one disk, and read speeds are twice as much.

RAID 1 is used when reliability needs to be higher than normal.

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mdadm Software RAID1 with GPT on Debian 8.0 amd64 - Does not boot on disk removal

INTRO: I have spent countless days attaching/detaching MOLEX->SATA power cables, rebooting machines and trying hundreds of edits and commands. I am on the verge of desperation and desperately in need of assistance. PROBLEME: As described in the…
Bob
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Replacing a failed drive - RAID 1

I have a Dell PowerEdge r310, MS Server 2008, RAID 1 setup. I had a two drives fail in the RAID 1 - leaving only one drive in a healthy state. Picture of disk management: I changed the primary boot partition to the Windows Server 2008 Secondary…
Jeff
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HP G8 migrate RAID0 to RAID1 with CLI commands

This is a Dynamic Smart Array B120i. The SSA (Smart Storage Administrator) is ver 1.50.4.0 The OS was installed into a single hard disc (bay 1), the SSA reports like RAID 0. Then I add a new hard disc into bay 2 (same size disc). I want to use this…
505JE
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RAID 1 fault " Status Ready for Rebuild : Rebuild Percentage Complete 0%"

Our RAID 1 system partition failed on our Windows 2008 SBS (physical environment). We still have disc 1 running but the 2nd disc in the raid is a failure. To add to the complication, disc 1 has bad sectors but in a partition that is not required. …
resolver101
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Raid 1 can not sync with new Drive . its stopping at 30 %

i had trying to add new HDD in place of Falty HDD. but new HDD can not sync with old one .sync process shown up to 30 % after that its stopped . cat /proc/mdstat Personalities : [raid1] md2 : active raid1 sda3[0] sdb3[2](S) 1458319504 blocks…
Bhavesh
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Upgrade SATA drive on Dell Poweredge 1950, RAID 1, Ubuntu server

My current set up is a Dell PowerEdge 1950, two 250GB SATA drives, RAID 1, OS is Ubuntu server. Using it for running OTRS (open source help desk). I'd like to upgrade the drives to the maximum capacity possible, and it's my understanding that 2TB is…
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Reassemble RAID 1 array from old system

I recently upgraded my OS from RHEL 5 to 6. To do so, I installed the new OS on new disks, and I want to mount the old disks. The old disks are listed as /dev/sdc and sdd in the new system, they were created as a RAID 1 array using LVM, using the…
RD Miles
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Various problems with software raid1 array built with Samsung 840 Pro SSDs

I am bringing to ServerFault a problem that is tormenting me for 6+ months. I have a CentOS 6 (64bit) server with an md software raid-1 array with 2 x Samsung 840 Pro SSDs (512GB). Problems: Serious write speed problems: root [~]# time dd…
Andy B
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Concerns of simultaneous failure of SSD Raid1

Since SSD's have a write limit requiring wear leveling one would assume that all things being equal 2 identical SSD drives would wear nearly identically if they mirror data writes. When one drive fails you can assume the other one is holding on by…
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RAID controller won't rebuild RAID-1 array

I have a RAID-1 array on a desktop computer. The RAID controller is a 3ware 7006-2. Recently the controller has been reporting ECC errors from one of the drives. It was able to correct all of those errors, but I figured I better replace the drive…
pacoverflow
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Something wrong with Linux software RAID1

I have a software RAID1 and now every week Linux synchronize my raid volume. I checked cat /proc/mdstat: *Personalities : [raid1] md3 : active raid1 sda5[0] sdb5[1] 1822445428 blocks super 1.0 [2/2] [UU] md1 : active…
webgeek
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mdadm raid1, drive failure lost 14days worth of data?

I am rather confused. One evening I had a server which had died. I went to reboot it and noticed it was stuck on the "GRUB" boot screen. I then noticed a hard drive had failed. I put a new hard drive in, booted into rescue mode and reinstalled…
Sc0rian
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Replacement raid1 drive is one block smaller. What to do?

Apparently once should always leave a bit of empty space at the end of each raid1 partition. But if we're too late for that, what can be done if a replacement RAID1 drive is slightly smaller than the surviving drive? Can the array be resized to be…
Bryce
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Copy entire filesystem in a folder where a raid-1 array is mounted

I am trying to migrate from a single disk drive system to a double disk drive software raid-1 system that already has a running system on it. Meaning that formatting and having a new installation of ubuntu using raid-1 is NOT an option. In this…
George Pligoropoulos
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Raid1 disk degraded after reboot

I'm testing a Rackspace cloud server and have two Cloud Block Storage volumes set up in a Raid1 configuration. There are no system files on these volumes, they're purely for storage. Everything appears to work fine until I reboot the server. After…
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