[tech] Backups

James Andrewartha trs80 at ucc.gu.uwa.edu.au
Thu Jul 11 21:14:29 AWST 2019


Mollitz will probably be inaccessible from 4pm tomorrow until some time 
Saturday afternoon due to network maintance at CCGS.

On Thu, 11 Jul 2019, David Adam wrote:

> As probably my last action as a Wheel member, I've sorted out something 
> about the backup server that's been bugging me for ages.
> 
> At present it has an SSD wedged in as a boot drive, and four 2 TB 
> drives (WD Red, 2 x WD Black, Hitachi Deskstar). Until just now, three of 
> these drives were in hardware RAID-5 with LVM and ext4 on top. The fourth 
> is in a RAID-0 (single disk) with ZFS on top.
> 
> I thought that the array could not be expanded without wiping it, and we 
> only had three drives initially. I put ZFS on the new drive to get 
> something out of compression, though we were only getting a compression 
> ratio of 1.01, so it's hardly worth it.
> 
> However, I discovered the PERC 5/i in the machine *can* resize the RAID - 
> online, even! - and it is currently doing so using this awful series of 
> commands:
> 
> Delete the old single-disk array, virtual disk 1 on adapter 0 with:
> # megacli -CfgLdDel -L1 -a0
> Start a reconfiguration operation on a RAID-5 array adding the new disk 
> (disk numbers from the incredibly useful megaclisas-status tool) to 
> virtual disk 0 on adapter 0:
> # megacli -LDRecon -Start -r5 -Add -PhysDrv '[8:2]' -L0 -a0
> Watch paint dry^W^W the array rebuild with:
> # megacli -LDRecon -ProgDsply -L0 -a0
> 
> This is likely to take some hours so I have disabled the backups for now 
> by commenting them out in the "backups" user crontab.
> 
> Mollitz itself is not backed up (except locally), so /backups/conf 
> probably needs putting into git or similar.
> 
> Once it's done I will resize the partition, LVM volume and the filesystem.
> 
> David Adam
> Soon-to-be-not UCC Wheel Member
> zanchey@
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