Gordon Messmer
2016-Nov-05 19:08 UTC
[CentOS] Avago (LSI) SAS-3 controller, poor performance on CentOS 7
On 11/05/2016 06:40 AM, Steven Tardy wrote:> What firmware is/are on the cards?In the dmesg output I included: mpt3sas0: LSISAS3008: FWVersion(10.00.00.00), ChipRevision(0x02), BiosVersion(08.25.00.00)> The driver version difference between C6 and C7 could interact badly with old firmware.I suspected that was the case, and tried running elrepo's "kmod-mpt3sas" from their testing repo. C7 has version 04.100.00.00, while elrepo's appears to be 13.100.00.00. That didn't change anything.> What firmware does $vendor suggest?Haven't asked yet, since the same firmware produces different behavior on the two OSs.> Does C7 in BIOS mode work any better?That'll be one of my next tests.> Run `lsiget` and compare lsi tech support bundles.I'll look around for that, too. No vendor tools are installed, currently.
John R Pierce
2016-Nov-05 19:54 UTC
[CentOS] Avago (LSI) SAS-3 controller, poor performance on CentOS 7
On 11/5/2016 12:08 PM, Gordon Messmer wrote:> On 11/05/2016 06:40 AM, Steven Tardy wrote: >> What firmware is/are on the cards? > > In the dmesg output I included: > mpt3sas0: LSISAS3008: FWVersion(10.00.00.00), ChipRevision(0x02), > BiosVersion(08.25.00.00) > >> The driver version difference between C6 and C7 could interact badly >> with old firmware. > > I suspected that was the case, and tried running elrepo's > "kmod-mpt3sas" from their testing repo. C7 has version 04.100.00.00, > while elrepo's appears to be 13.100.00.00. That didn't change anything. > >> What firmware does $vendor suggest? > > Haven't asked yet, since the same firmware produces different behavior > on the two OSs.I know with the SAS2 chips (SAS2008, SAS2308, etc), FreeBSD strongly recommends the firmware revision matches the driver revision, so if the driver is P20, the firmware also should be P20. I don't have any SAS3 stuff. -- john r pierce, recycling bits in santa cruz
Gordon Messmer
2016-Dec-20 00:12 UTC
[CentOS] LVM appears to be very expensive on CentOS 7
After running a long series of benchmarks, it looks like there is a very significant performance difference between systems using LVM and systems not using LVM under CentOS 7. I'd appreciate it if anyone else can confirm these results. There are a couple of other surprising aspects of the results, especially that the default storage configuration (LVM and 512k blocks) appears to be the worst configuration possible, when using RAID5 (and probably RAID6). https://plus.google.com/+GordonMessmer/posts/H5DuyP1LHPU?sfc=true