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Re: [Xen-users] Save options for XFS over ISCSI ~ 17TB (for backup)


Well, this is not truly a question for the Xen mailing list... however.
If perfromance doesn't matter that much, you can first use the "sync" mount
option wich would make sure I/O are written to the media asap. Also using "barriers=yes" (which should be the default) would ensure better reliability. Ihave also heard using a different local device as the logdevice is a good idea... for exemple a local flash or sata drive.


Le 24/02/2012 08:43, Denny Schierz a écrit :

I want to migrate away from Solaris with ZFS to Linux with XFS (BTRFS is to young) . At the moment, I have Solaris 10 with ISCSI initiator running and a zpool with a size round about ~17TB. The ISCSI target  is a Linux Debian with "tgt" Daemon and connected via SAS (LSI Logic / Symbios Logic SAS2008) to several LSI JBODS (630j). 

Every jbod has 12 (2TB) disks and managed by mdadm as a RAID6 device and on top LVM. I have two ISCSI target servers (one for _cold_ standby) and all servers has  power connection via UPS and a second direct one.

As I sad, I want to get away from Solaris 10 and know I search for options to use XFS with save options, in case of emergency (poweroff etc.). We use the JBODS mostly for backups (bacula) so, performance/realtime isn't imported, since network is the limit.

Under ZFS I can make sure,  with zpool scrub (file system check), that all data are completely  written and consistence. But what is the best way under XFS? Should I remount XFS every month for a file system check (re/mount) ? What happens in the case, of ISCSI problems?

So, I need just a few suggestions :-)

cu denny

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Alexandre Chapellon

Ingénierie des systèmes open sources et réseaux.
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