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visits member for 2 years
seen Feb 6 at 0:02

Feb
22
awarded  Tumbleweed
Feb
15
asked Apply libvirt nwfilter without editing of XML
Oct
10
comment Poor HP Procurve 2848 port performance
The issue is now SOLVED: the lack of per port buffer memory leaded to packet drop and TCP session reestablishing, which on high-RTT connections caused the TCP Windows Scaling to reset. Enabling Flow Control on both sides fixed the issue.
Oct
5
comment Poor HP Procurve 2848 port performance
no, it happens on every port
Oct
5
asked Poor HP Procurve 2848 port performance
Sep
17
comment Areca 1880ix RAID hangs
After deep investigation I finally resolved the issue with Areca hanging. The actual problem was NOT in Areca, but in software used (thanks to Chida's comment). I was using Infiniband with SRP protocol, which is provided by SCST driver. The issue was in that SCST driver - with having high load it did SCSI bus reset, which turned out to be the reason of Areca's firmware hanging. After migrating from SCST to simple iSCSI (IPoIB) the problem disappeared.
Sep
3
awarded  Student
Sep
3
comment Page allocation failures on iSCSI storage
About your questions: 1. The performance is fine. We had SRP instead of IPoIB + iSCSI, but the SCST driver hang on high load causing a SCSI reset. 2. The bug is reproducible: it appeared on every high load (writes). 3. ext3 and ntfs for Windows.
Sep
3
comment Page allocation failures on iSCSI storage
Thank you! After googling I found that I'm getting these errors because of bug in rhel 6.2 and above: bugzilla.redhat.com/show_bug.cgi?id=770545. After sysctl -w vm.zone_reclaim_mode=1 errors seem to disappear.
Sep
3
asked Page allocation failures on iSCSI storage
Aug
10
asked Areca 1880ix RAID hangs