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2020 Sep 19
storage for mailserver
On 9/17/20 4:25 PM, Phil Perry wrote: > On 17/09/2020 13:35, Michael Schumacher wrote: >> Hello Phil, >> >> Wednesday, September 16, 2020, 7:40:24 PM, you wrote: >> >> PP> You can achieve this with a hybrid RAID1 by mixing SSDs and HDDs, and >> PP> marking the HDD members as --write-mostly, meaning most of the reads >> PP> will come from the faster SSDs retaining much of the speed advantage, >> PP> but you have the redundancy of both SSDs and HDDs in the array. >> >> P...
2014 Apr 07
Software RAID10 - which two disks can fail?
Hi All. I have a server which uses RAID10 made of 4 partitions for / and boots from it. It looks like so: mdadm -D /dev/md1 /dev/md1: Version : 00.90 Creation Time : Mon Apr 27 09:25:05 2009 Raid Level : raid10 Array Size : 973827968 (928.71 GiB 997.20 GB) Used Dev Size : 486913984 (464.36 GiB 49...
2016 Jun 01
Centos 7 and Software Raid Minimal Install
...install Centos 7 on a couple 4TB drives with software raid. In the Supermicro bios I set UEFI/BIOS boot mode to legacy. I am using the Centos 7 minimal install ISO flashed to a USB thumb drive. So I do custom drive layout something like this using sda and sdb. Create /boot as 512 MB XFS raid1 array. Create SWAP as 32 GB SWAP raid1 array. Create / on TB XFS raid1 array. I then get error. "Your BIOS-based system needs a special partition to boot from a GPT disk label. To countinue, please create a 1MiB 'biosboot' type partition." I cannot seem to create t...
2011 Jan 12
Filesystem creation in "degraded mode"
I''ve had a go at determining exactly what happens when you create a filesystem without enough devices to meet the requested replication strategy: # mkfs.btrfs -m raid1 -d raid1 /dev/vdb # mount /dev/vdb /mnt # btrfs fi df /mnt Data: total=8.00MB, used=0.00 System, DUP: total=8.00MB, used=4.00KB System: total=4.00MB, used=0.00 Metadata, DUP: total=153.56MB, used=24.00KB Metadata: total=8.00MB, used=0.00 The data section is single-copy-o...
2020 Sep 17
storage for mailserver
Hello Phil, Wednesday, September 16, 2020, 7:40:24 PM, you wrote: PP> You can achieve this with a hybrid RAID1 by mixing SSDs and HDDs, and PP> marking the HDD members as --write-mostly, meaning most of the reads PP> will come from the faster SSDs retaining much of the speed advantage, PP> but you have the redundancy of both SSDs and HDDs in the array. PP> Read performance is not far off nati...
2011 Feb 14
rescheduling sector linux raid ?
..., What this means? md: syncing RAID array md0 md: minimum _guaranteed_ reconstruction speed: 1000 KB/sec/disc. md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reconstruction. md: using 128k window, over a total of 2096384 blocks. md: md0: sync done. RAID1 conf printout: --- wd:2 rd:2 disk 0, wo:0, o:1, dev:sda2 disk 1, wo:0, o:1, dev:sdb2 sd 0:0:0:0: SCSI error: return code = 0x06000000 end_request: I/O error, dev sda, sector 451792231 raid1: sda1: rescheduling sector 451792168 sd 0:0:0:0: SCSI error: return code = 0x06000000 end_request: I...
2012 Dec 17
Feeback on RAID1 feature of Btrfs
Hello, I''m testing Btrfs RAID1 feature on 3 disks of ~10GB. Last one is not exactly 10GB (would be too easy). About the test machine, it''s a kvm vm running an up-to-date archlinux with linux 3.7 and btrfs-progs 0.19.20121005. #uname -a Linux seblu-btrfs-1 3.7.0-1-ARCH #1 SMP PREEMPT Tue Dec 11 15:05:50 CET 2012 x86_64...
2010 Oct 19
more software raid questions
hi all! back in Aug several of you assisted me in solving a problem where one of my drives had dropped out of (or been kicked out of) the raid1 array. something vaguely similar appears to have happened just a few mins ago, upon rebooting after a small update. I received four emails like this, one for /dev/md0, one for /dev/md1, one for /dev/md125 and one for /dev/md126: Subject: DegradedArray event on ...
2014 Jan 24
Booting Software RAID
...RAID 1 array. Filesystem Size Used Avail Use% Mounted on /dev/md2 97G 918M 91G 1% / tmpfs 16G 0 16G 0% /dev/shm /dev/md1 485M 54M 407M 12% /boot /dev/md3 3.4T 198M 3.2T 1% /vz Personalities : [raid1] md1 : active raid1 sda1[0] sdb1[1] 511936 blocks super 1.0 [2/2] [UU] md3 : active raid1 sda4[0] sdb4[1] 3672901440 blocks super 1.1 [2/2] [UU] bitmap: 0/28 pages [0KB], 65536KB chunk md2 : active raid1 sdb3[1] sda3[0] 102334336 blocks super 1.1 [2/2] [UU]...
2019 Jan 10
Help finishing off Centos 7 RAID install
...with this is that it is dependant on sda for booting. >> I >> did find an aritcle on how to set up boot loading on multiple HDD's, >> including cloning /boot/efi but I now can't find it. Does anyone know >> of a >> similar article? > > > Use RAID1 for /boot/efi as well.? The installer should get the details > right. Are you sure? How is the EFI firmware going to know about the RAID1? RAID1 is going to have type FD00 (Linux RAID) whereas EFI firmware expects type EF00 (EFI System Partition) to boot from. EFI then reads the GPT t...
2013 Mar 03
Strange behavior from software RAID
Somewhere, mdadm is cacheing information. Here is my /etc/mdadm.conf file: more /etc/mdadm.conf # mdadm.conf written out by anaconda DEVICE partitions MAILADDR root ARRAY /dev/md0 level=raid1 num-devices=4 metadata=0.90 UUID=55ff58b2:0abb5bad:42911890:5950dfce ARRAY /dev/md1 level=raid1 num-devices=2 metadata=0.90 UUID=315eaf5c:776c85bd:5fa8189c:68a99382 ARRAY /dev/md2 level=raid1 num-devices=2 metadata=0.90 UUID=5b017f95:b7e266cc:f17a7611:8b752a02 ARRAY /dev/md3...
2014 Dec 05
CentOS 7 install software Raid on large drives error
...y, December 04, 2014 7:18 AM Subject: Re: [CentOS] CentOS 7 install software Raid on large drives error > On Wed, 3 Dec 2014, Jeff Boyce wrote: > >>I am trying to install CentOS 7 into a new Dell Precision 3610. I have >>two 3 >>TB drives that I want to setup in software RAID1. I followed the guide >>here >>for my install as it looked fairly detailed and complete >>( > > I suggest using the install guide rather than random crud. The storage > admin guide is...
2009 May 08
Software RAID resync
I have configured 2x 500G sata HDD as Software RAID1 with three partitions md0,md1 and md2 with md2 as 400+ gigs Now it is almost 36 hours the status is cat /proc/mdstat Personalities : [raid1] md0 : active raid1 hdb1[1] hda1[0] 104320 blocks [2/2] [UU] resync=DELAYED md1 : active raid1 hdb2[1] hda2[0] 4096448 block...
2007 Apr 25
Raid 1 newbie question
Hi I have a Raid 1 centos 4.4 setup and now have this /proc/mdstat output: [root at server admin]# cat /proc/mdstat Personalities : [raid1] md2 : active raid1 hdc2[1] hda2[0] 1052160 blocks [2/2] [UU] md1 : active raid1 hda3[0] 77023552 blocks [2/1] [U_] md0 : active raid1 hdc1[1] hda1[0] 104320 blocks [2/2] [UU] What happens with md1 ? My dmesg output is: [root at server admin]# dmesg | grep md1...
2007 Aug 21
Saftware RAID1 or Hardware RAID1 with Asterisk
Dear All, I would like to get community's feedback with regard to RAID1 ( Software or Hardware) implementations with asterisk. This is my setup Motherboard with SATA RAID1 support CENT OS 4.4 Asterisk 1.2.19 Libpri/zaptel latest release 2.8 Ghz Intel processor 2 80 GB SATA Hard disks 256 MB RAM digium PRI/E1 card Following are the concerns I am having I'...
2014 Feb 07
Software RAID1 Failure Help
I am running software RAID1 on a somewhat critical server. Today I noticed one drive is giving errors. Good thing I had RAID. I planned on upgrading this server in next month or so. Just wandering if there was an easy way to fix this to avoid rushing the upgrade? Having a single drive is slowing down reads as well, I thi...
2017 Sep 20
xfs not getting it right?
Chris Adams wrote: > Once upon a time, hw <hw at> said: >> xfs is supposed to detect the layout of a md-RAID devices when creating the >> file system, but it doesn?t seem to do that: >> >> >> # cat /proc/mdstat >> Personalities : [raid1] >> md10 : active raid1 sde[1] sdd[0] >> 499976512 blocks super 1.2 [2/2] [UU] >> bitmap: 0/4 pages [0KB], 65536KB chunk > > RAID 1 has no "layout" (for RAID, that usually refers to striping in > RAID levels 0/5/6), so there's not...
2012 Oct 23
Between single/dup and raid1/raid1
Hello, today I wanted to remove one drive from raid1, and people at #btrfs advised me to use ''-dconvert=single'' before ''btrfs device delete''. I thought of adding ''-mconvert=dup'' too, but the kernel does not let me do that. It looks like ''dup'' is disallowed for an array of multi...
2006 Dec 27
Software RAID1 issue
...correct. swapoff -a raidstop /dev/md3 mkraid /dev/md3 --really-force swapon -a And then I get a proper ourput for /proc/mdstat, but when I reboot /proc/mdstat again reads as below, with md3 [0] [1] reversed. [root]# cat /proc/mdstat Personalities : [raid1] md3 : active raid1 hda3[0] hdc3[1] 1000320 blocks [2/2] [UU] md1 : active raid1 hdc1[1] hda1[0] 1953408 blocks [2/2] [UU] md2 : active raid1 hdc2[1] hda2[0] 1953408 blocks [2/2] [UU] md5 : active raid1 hdc5[1] hda5[0] 1953408 blocks [2/2] [UU] md6 : acti...
2014 Jul 25
Convert "bare partition" to RAID1 / mdadm?
I have a large disk full of data that I'd like to upgrade to SW RAID 1 with a minimum of downtime. Taking it offline for a day or more to rsync all the files over is a non-starter. Since I've mounted SW RAID1 drives directly with "mount -t ext3 /dev/sdX" it would seem possible to flip the process around, perhaps change the partition type with fdisk or parted, and remount as SW RAID1? I'm not trying to move over the O/S, just a data paritition with LOTS of data. So far, Goo...