i use raid 5 for all my storage pools. i stripe the arrays across as many
spindles as possible, for our hardware that is 15 1TB drives with the 16th used
as a hot spare. i use a 256kb stripe size and align the OS partition at a 512
sector offset. rebuild time is about 6 hours for the 15 drive 14TB array, at
which time there's a slight slow down in I/O. i have 150TB setup this way.
john
>>> Skylar Thompson <skylar2 AT U.WASHINGTON DOT EDU> 8/9/2010 11:32 AM >>>
Do you have tape in your primary storage hierarchy? If so, remember that
even if part of your disk pool fails, you only lose access to the data
that are on the failed volumes. You can then regenerate that data by
either running another backup from the nodes that had backed up to that
volume (if the backup to the copy pool hasn't happened yet) or from the
copy pool. New backups can continue against the disk pool volumes that
are still available, or can be cut through directly to tape if the
entire pool is unavailable.
On 08/09/10 08:23, Dana Holland wrote:
> Does anyone have opinions about setting up storage pools as Raid 1 as
> opposed to Raid 5? We have a very limited amount of disk space at the
> moment and don't know when we'll get approval to buy more. At the time
> we first started planning to implement TSM, we purchased what we thought
> would be plenty of storage. But, that was 4 years ago - and our usage
> has grown. Now, if I choose Raid 1, I barely have enough to create a
> primary and copy storage pool for one of our servers. And that isn't
> allowing for any growth at all. And I'm not sure how much additional
> space incremental backups would take. I know Raid 5 would give me more
> storage space, but I've also read that it's harder to recover from if
> there's a disk failure (read this on a TSM site somewhere). So, I'm
> wondering what some of you are using?
>
>
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-- Skylar Thompson (skylar2 AT u.washington DOT edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S048, (206)-685-7354
-- University of Washington School of Medicine
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