Hello Zoltan: I have about 500 volumes spread across a dozen or so EXT4 filesystems, and get performance that operates at the maximum throughput of the hardware.
Here is a good primer on the differences. The bottom line - ext4 can perform better than ext3. http://www.thegeekstuff.com/2011/05/ext2-ext3-ext4/ Best regards, Mike, x7942 RMD IT Client Services On Thu, Jan 28, 2016 at 1:43 PM, Zoltan Forray <[email protected]> wrote: > Mike, > > Thanks, again. Very helpful. So, did I understand your earlier > statement/comment that you disagree with "*Set the LVM read-ahead to 0 for > all logical volumes on disk systems that provide adaptive read-ahead > capabilities, for example, enterprise-type disk systems.*" > > I also read the statement "*For the Tivoli Storage Manager database and > logs, use the ext3 file system.*" Whats up with that? They explain why > you should use ext4 for the storage volumes but no details on ext3 for > DB/logs? > > On Thu, Jan 28, 2016 at 1:05 PM, Ryder, Michael S < > [email protected] > > wrote: > > > Hi Zoltan > > > > Here is the reference... I know it is for TSM 7.1, but the reference is > > specific to RHEL and it's filesystems, which is still relevant to the > > discussion, I think: > > > > > > > http://www-01.ibm.com/support/knowledgecenter/SSGSG7_7.1.0/com.ibm.itsm.perf.doc/t_perf_diskos_lnx.html > > > > Best regards, > > > > Mike, x7942 > > RMD IT Client Services > > > > On Thu, Jan 28, 2016 at 11:38 AM, Zoltan Forray <[email protected]> wrote: > > > > > On Wed, Jan 27, 2016 at 10:05 AM, Ryder, Michael S < > > > [email protected]> wrote: > > > > > > > Did you follow the docs and disable RHEL's read-ahead > > > > caching? If so, you may want to consider enabling it. > > > > > > > > > > Mike, > > > > > > Can you expand on your statement about RHEL read-ahead cache and some > > > tuning/config document you refer to? We were unaware of such a > document > > > (or config value). The RHEL read-ahead cache is set to the default of > > > 128K. Currently all caching is via PERC. > > > > > > > > > -- > > > *Zoltan Forray* > > > TSM Software & Hardware Administrator > > > Xymon Monitor Administrator > > > Virginia Commonwealth University > > > UCC/Office of Technology Services > > > www.ucc.vcu.edu > > > [email protected] - 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 > > > > > > > > > -- > *Zoltan Forray* > TSM Software & Hardware Administrator > Xymon Monitor Administrator > Virginia Commonwealth University > UCC/Office of Technology Services > www.ucc.vcu.edu > [email protected] - 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 >
