tech/UsingLongtermStorage written at 22:26:35; Add Comment
Long term storage management in the field
I've recently been thinking about what features we need for painless long term storage management, and in the process I've been thinking about what we actually do here with our SAN-based NFS fileserver storage over time. Somewhat condensed, we seem to:
We keep equipment for a fairly long time; our oldest SAN RAID unit is SCSI-based, for example. (And not fast modern SCSI either; it dates from the days when SCSI was your only viable choice in this space.)
We make no attempt to keep the number of front-end fileservers the same as the number of SAN RAID controllers; we have had more, less, and the same as circumstances change. The net effect is that natural evolution causes every fileserver to have disk space on more than one controller and each controller being used by more than one fileserver.
(Avoiding this would be nice but it's hard. Adding and consolidating storage without necessarily changing the number of fileservers makes this happen naturally over time, so we would have to contrive some painless and user-transparent way of moving filesystems between fileservers. Our fileservers are virtual ones, which makes it somewhat easier, but I don't think anyone's systems currently support this.)
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