>-----Original Message----- >From: Johan Ehnberg <[email protected]> >Sent: Tuesday, August 14, 2018 07:29 >To: [email protected] >Subject: Re: [BackupPC-users] Which file system for data pool? > > >On 08/14/2018 02:44 PM, Tapio Lehtonen wrote: >> I'm building a BackupPC host, with two SSD disks and two 4 TB rotating >> disks connected to LSI Logic / Symbios Logic MegaRAID SAS 2108 >> [Liberator] (rev 05). Operating system is Debian GNU/Linux 9.5. The plan >> is to put OS on SSD disks with RAID1, and BackupPC data pool to rotating >> disk with RAID1. SSD disks are 240 GB each, I'm open to suggestions how >> to use part of them for cache or journal device or something. >> >> That disk controller has reasonably performant RAID with battery backup, >> so I prefer using those features. Thus ZFS is not good, my understanding >> is ZFS should be used with plain host bus adapters. >> >> I'm thinking XFS, so inode allocation is not a problem (previously I >> asked in this mailing list how to recover from out of inodes). What I >> read indicate XFS is equal or better than Ext4 for most features. >> >> I could not find recent recommendations for file system used with >> BackupPC. Those old ones I found say ReiserFS is good, it probably is >> but not much maintained recently. >> >> So, any recommendation for file system? >> > > >Terve Tapio, > >I would also choose XFS in your case since ZFS is not a good option for you. >Furthermore, if you want to put the SSD:s to good use, you can put the >'pc' folder on them if the following conditions are being met: > >- You are running BackupPC 4 >- You have no BackupPC 3 backups left (no hardlinks between pc and cpool >or pool) >- $Conf{PoolV3Enabled} is off > >That will give you a huge performance boost for indexing etc. > >Best regards, >Johan Ehnberg > >-- >Johan Ehnberg >Founder, CEO >[email protected] >+358503209688 > >Molnix Oy >molnix.com >
Interesting discussion. I also put the xfs journal on SSD using: 'mkfs.xfs -l size=64m,logdev=/dev/sdb1 /dev/mapper/luks' where the luks-encrypted partition is in an LVM on platters and sdb1 is an Azure "resource" temporary storage. Regarding the location of the "pc" folder... I think I need to re-visit that since I created a symlink from /var/lib/BackupPC and moved the entire contents of that folder to my platters. It sounds like I need to undo that to keep the "pc" folder on the SSD. Would a better move be to create a symlink just to the "cpool" folder? ie: ln -s /mnt/backup-volume/BackupPC/cpool /var/lib/BackupPC/cpool and leave "pool" and "pc" on the SSD with the operating system? ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
