On Wed, Jan 27, 2016 at 10:05 AM, Ryder, Michael S < michael_s.ry...@roche.com> wrote:
> Are you using TDP for Virtual Environments for block-level image backups? > Do you have deduplication enabled? Both features will grind away at your > log filesystems. In my case enabling those features tripled the size of > the DB and the rate and size at which the log space is used. > > At the same time TSM is trying to stream data to your primary disk-based > storage pool, it is also trying to update its log files. > No DeDup and currently no TSMVE but looking at it > When they both > exist on the same physical drives, those drives will be taxed in trying to > perform both operations - even with a single array controller it would be > more efficient to have spindles dedicated to log/db filesystems. Perhaps > consider replacing your OS/DB/App drives with a mirror of large SSDs, and > put the log files there, too. Even if they are all on the same array > controller, the speed improvement for the DBs and logs should lower the > latency of operations concerning your RAID5 array. > > What filesystem? ext3 or ext4? If you're on ext3, I understand from IBM's > docs that as of RHEL6.x ext4 is suitable and provides some performance > improvement. Did you follow the docs and disable RHEL's read-ahead > caching? If so, you may want to consider enabling it. > Everything is ext4. Will discuss the read-ahead caching with the OS guy. > > Wait... why would you be able to go with RAID10? You would go from a RAID5 > array of (6) 6TB drives of *30TB*... to a RAID10 array of (6) 6TB drives of > *18TB* - I thought you said you couldn't slice and dice this anymore? > This was mentioned at the last meeting to discuss the performance issues since we are discussing completely wiping/rebuilding the box due to the questionable state of the OS. > > Sadly - if you don't have any other flexibility, I think you will have to > live with your performance, because your priority was for capacity and > unfortunately you can't have both in these harddrives. > A correction. The server is a R730xd. Dell specs say the drives are "6TB 7.2K RPM NLSAS 6Gbps 512e 3.5in Hot-plug". The 2-1TB are the same specs other than being 2.5in. The box came with 6-6TB drives and 4-slots empty. We moved 6-600GB SAS drives into the empty slots and created another RAID5 array of ~1.7TB for additional storage. Sounds like maybe we should move the DB/logs/archlogs to it? -- *Zoltan Forray* TSM Software & Hardware Administrator Xymon Monitor Administrator Virginia Commonwealth University UCC/Office of Technology Services www.ucc.vcu.edu zfor...@vcu.edu - 804-828-4807 Don't be a phishing victim - VCU and other reputable organizations will never use email to request that you reply with your password, social security number or confidential personal information. For more details visit http://infosecurity.vcu.edu/phishing.html
