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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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Data scrubbing and repairing a RAID1 mirror?

In Linux, if I have a software RAID1 mirror /dev/md1 with N ≥ 1 active devices, what are the semantics of the repair command? echo "repair" >/sys/block/md1/md/sync_action Am I correct to assume that in case of 1 active device, the repair command…
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Raid 1 or Windows Mirroring: Can I just detach one of the HDDs and use it?

I am deciding on RAID level and one feature (requirement) I like to have is to be able to (have the freedom) detach one of the RAID HDDs, plug it as a USB disk to my laptop and read/backup/recover its data. This way I know I am NOT dealing with some…
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Different RAID settings for different folders on the same logical drive

I have a NAS drive that shares files on my local network. I attached the logical drive letter X on my Windows 7 computer to this sharing. I am thinking of purchasing additional hard drives and setting up a RAID1 system. However, one of my folders…
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Dell PowerEdge T520, PERC H310 RAID 1, can I hot swap a HDD without shutting down the server?

I have a Dell Poweredge T520 running Win Server 2008 Rc2 with a PERC H310 RAID Controller. Two 15000 rpm 600GB hard drives setup in RAID 1. One drive is rapid flashing orange indicating failure. Can I take out the failed drive and hot swap a new…
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Hot swapping under RAID 1

I have a server that supports hot swapping (such as HP ProLiant DL160 G6 with hot swap) (spec) and I configure it for RAID 1 mirroring across 2 disks. Say one of the raid'ed disks then fails. Can I simply pull out the duff disk and replace it…
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Uneven disc throughput in RAID1 configuration

I am having performance issue caused by slow IO in server which has two identical SSDs in RAID1 configuration. By using "atop" noticed that discs usage is no even: DD | md2 | busy 0% | read 0 | write 1717 | MBr/s 0.00 |…
Nerijus
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mdadm - RAIDs of partitions or partitions of RAID?

If using entire drives for an mdadm RAID which will be the boot device as well, is it more correct / standard to: 1) Configure the RAID out of partitions that encompass the whole drive (like /dev/sda1 + /dev/sdb1) and then partition the resulting…
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Can mdadm convert a RAID5 to a RAID1?

I have a RAID5 consisting of 3 disks, one of which is broken. I was wondering if it is possible to convert those two disks to a RAID1 without data loss and without having to back-up the data elsewhere.
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Ubuntu 14.04 Installation with Preseeded RAID 1 Partitioning

I have been having a painful time trying to automate an Ubuntu 14.04 Server Installation with RAID 1 partitioning. I'm testing this on top of VirtualBox with two Virtual Disk Images (dynamically allocated to increase in size up to 1TB) and a custom…
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Unable to boot into software RAID1 after disk failure

Today after restarting my data server I was unable to boot because one of the drives wasn't being recognized any more, it is still spinning when I connect it and not making many weird noises except for a very slight (kind of muted) ticking sound for…
reveance
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mdadm: Convert RAID10 to RAID1

The machine in question is equipped with 4x ssd, and running Debian wheezy 7.8, linux kernel 3.2.0-4, mdadm v3.2.5. Currently I'm using a RAID10 consisting of all these ssd. I've to increase the storage capacity, ssd are to expensive for this, and…
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How can I coax RHEL / CentOS / SL 7 into booting normally with degraded software RAID 1

I set up a new server (my first with this version of Linux). I installed a pair of 160 GB blank SATA HDDs (one Seagate and one WDC, but with exactly the same number of LBA sectors) in an old machine, and set out to install Scientific Linux 7.0…
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md raid1 reading from one disk only

I have two identical HDD in a linux software raid 1. I observed a mostly reading load on this raid device, with the process showing mostly iowait. iotop shows about 75% disk utilisation overall. If I look now at the disk utilisations of the physical…
michael
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Solaris 9: Degraded mirror unmanageable with raidctl after drive replacement

We have a pair of Sunfire v20z's (WITH LSI MPT raid) that have each had one drive in their mirrors die. bash-2.05# cat /etc/release Solaris 9 4/04 s9x_u6wos_08a x86 Copyright 2004 Sun Microsystems, Inc. All Rights…
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HP DL320e Gen8, 3TB drives, Windows Server 2012 R2 - HDD full capacity alocation difficulties during installation

One interesting task to do but not so easy as i thought. The server is HP DL320e gen8, The main difficulty is with partitioning the RAID1 (2x3TB HDDs) during the installation on 2 partitions (System = 200GB and Data = the rest of the space ~ 2.7TB)…
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