I want add one thing to what other says, we discussed this between Cephalocon sessions, avoid HP controllers p210/420, or upgrade firmware to latest. These controllers has strange bug, during high workload they restart itself. BR, Sebastian > On 19 Apr 2023, at 08:39, Janne Johansson <icepic.dz@xxxxxxxxx> wrote: > > Den ons 19 apr. 2023 kl 00:55 skrev Murilo Morais <murilo@xxxxxxxxxxxxxx>: >> Good evening everyone! >> Guys, about the P420 RAID controller, I have a question about the operation >> mode: What would be better: HBA or RAID-0 with BBU (active write cache)? > > As already said, always give ceph (and zfs and btrfs..) the raw disks > to handle for itself, instead of doing hardware striping/raiding and > so on. > > There are multiple reasons for this, including weird/bad firmware and > (for raid0) loss of redundancy and so on, but there are also corner > cases where you may need/want to move disks from one box to another. > If you use "raw" disks, then what is on the platters most often is 1:1 > to what the computer sees, and hence if you move the drive over to > another box, it will not matter if it has a HBA or Raid card, what > brand of disk controller it is and so on. The new server will also see > 1:1 of the data the former machine wrote and this is what you want. > > If you have a raid0/jbod/raid1/raidX setup on a particular raid > controller card with a particular firmware version, you may not be > able to move your complete raid set over to a newer box. Perhaps the > raid card model is no longer available, perhaps the raid firmware > logic is new and different on how to stripe data or place sectors on > the raid members. Perhaps it detects disks in the wrong order or > something. > > It is very possible that you have zero problems with raid setups, but > the extra complexities when moving raid sets from one generation of > computer/controller to another makes the risk of some kind of > portability issue non-zero. Old grumpy storage admins don't like > non-zero risks if we actually can avoid it. > > -- > May the most significant bit of your life be positive. > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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