Re: [CentOS] RAID questions

2017-02-19 Thread Dennis Jacobfeuerborn
On 15.02.2017 03:10, TE Dukes wrote: > > >> -Original Message- >> From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of John R >> Pierce >> Sent: Tuesday, February 14, 2017 8:13 PM >> To: centos@centos.org >> Subject: Re: [CentOS] RAID que

Re: [CentOS] RAID questions

2017-02-17 Thread Keith Keller
On 2017-02-17, John R Pierce wrote: > On 2/16/2017 9:18 PM, Keith Keller wrote: >>> Only some systems support that sort of restriping, and its a dangerous >>> activity (if the power fails or system crashes midway through the >>> restriping operation, its probably not

Re: [CentOS] RAID questions

2017-02-17 Thread Gordon Messmer
On 02/16/2017 09:18 PM, Keith Keller wrote: Doesn't mdraid support changing RAID levels? It supports a small number of conversions. See the "GROW MODE" section of mdadm for details. ___ CentOS mailing list CentOS@centos.org

Re: [CentOS] RAID questions

2017-02-16 Thread John R Pierce
On 2/16/2017 9:18 PM, Keith Keller wrote: On 2017-02-15, John R Pierce wrote: On 2/14/2017 4:48 PM,tdu...@palmettoshopper.com wrote: 3 - Can additional drive(s) be added later with a changein RAID level without current data loss? Only some systems support that sort of

Re: [CentOS] RAID questions

2017-02-16 Thread Keith Keller
On 2017-02-15, John R Pierce wrote: > On 2/14/2017 4:48 PM, tdu...@palmettoshopper.com wrote: > >> 3 - Can additional drive(s) be added later with a changein RAID level >> without current data loss? > > Only some systems support that sort of restriping, and its a dangerous >

Re: [CentOS] RAID questions

2017-02-14 Thread Andreas Benzler
Am Dienstag, den 14.02.2017, 20:21 -0500 schrieb Digimer: > On 14/02/17 08:12 PM, John R Pierce wrote: > > On 2/14/2017 5:08 PM, Digimer wrote: > >> Note; If you're mirroring /boot, you may need to run grub install on > >> both disks to ensure they're both actually bootable (or else you might > >>

Re: [CentOS] RAID questions

2017-02-14 Thread TE Dukes
> -Original Message- > From: CentOS [mailto:centos-boun...@centos.org] On Behalf Of John R > Pierce > Sent: Tuesday, February 14, 2017 8:13 PM > To: centos@centos.org > Subject: Re: [CentOS] RAID questions > > On 2/14/2017 5:08 PM, Digimer wrote: > > Note;

Re: [CentOS] RAID questions

2017-02-14 Thread Digimer
On 14/02/17 08:12 PM, John R Pierce wrote: > On 2/14/2017 5:08 PM, Digimer wrote: >> Note; If you're mirroring /boot, you may need to run grub install on >> both disks to ensure they're both actually bootable (or else you might >> find yourself doing an emergency boot off the CentOS ISO and

Re: [CentOS] RAID questions

2017-02-14 Thread John R Pierce
On 2/14/2017 5:08 PM, Digimer wrote: Note; If you're mirroring /boot, you may need to run grub install on both disks to ensure they're both actually bootable (or else you might find yourself doing an emergency boot off the CentOS ISO and installing grub later). I left that out because the OP

Re: [CentOS] RAID questions

2017-02-14 Thread Digimer
On 14/02/17 07:58 PM, John R Pierce wrote: > On 2/14/2017 4:48 PM, tdu...@palmettoshopper.com wrote: >> 1- Better to go with a hardware RAID (mainboardsupported) or software? > > I would only use hardware raid if its a card with battery (or > supercap+flash) backed writeback cache, such as a

Re: [CentOS] RAID questions

2017-02-14 Thread John R Pierce
On 2/14/2017 4:48 PM, tdu...@palmettoshopper.com wrote: 1- Better to go with a hardware RAID (mainboardsupported) or software? I would only use hardware raid if its a card with battery (or supercap+flash) backed writeback cache, such as a megaraid, areca, etc. otherwise I would use mdraid

[CentOS] RAID questions

2017-02-14 Thread tdukes
Hello, Just a couple questions regarding RAID. Here's thesituation. I bought a 4TB drive before I upgraded from 6.8 to 7.3. I'm not too far into this that Ican't start over. I wanted disk space to backup 3 other machines. I way overestimated what I needed for full, incremental and image backups