Hi, First suspect if fragmented fs. Please run the attached script and send the ouput. Thanks. -Tariq On 09/19/2015 03:43 PM, Alan Hodgson wrote:
I've had this filesystem in production for 8 months or so. It's on an array of Intel S3500 SSDs on an LSI hardware raid controller (without trim).This filesystem has pretty consistently delivered >500MB/sec writes, up to 300 from any particular guest, and has otherwise been responsive. Then, within the last couple of days, it is now writing at like 25-50 MB/sec on average, and seems to block reads for long enough to cause guest issues. It is a 2-node cluster, the file system is on top of a DRBD active/active cluster. The node interconnection is a dedicated 10 Gbit link. The SSD array doesn't seem to be the issue. I have local file systems on the same array, and they write at close to 1GB/sec. Not quite as fast as new, but still decent. DRBD still seems to be fast. Resync appears to be happening at over 400 MB/sec, although not tested extensively as I don't want to resync the whole partition. And the issue remains regardless of whether the second node is even up. Writes to ocfs2 with either one or both nodes mounted ... 25-50 MB/sec. And super slow/blocked reads within the guests while it's doing them. The cluster is really quite screwed as a result. A straight dd to a file on the host averages 25MB/sec. Reads are fine, though, well over 1GB/sec. The file system is a little less than half full. It hosts only KVM guest images (raw sparse files). I have added maybe 300GB of data in the last 24 hours, but I do believe this started happening before that. Random details below, happy to supply anything ... thanks in advance for any help. df: /dev/drbd0 4216522032 1887421612 2329100420 45% /vmhost mount: configfs on /sys/kernel/config type configfs (rw,relatime) none on /sys/kernel/dlm type ocfs2_dlmfs (rw,relatime) /dev/drbd0 on /vmhost type ocfs2 (rw,relatime,_netdev,heartbeat=local,nointr,data=ordered,errors=remount- ro,atime_quantum=60,localalloc=53,coherency=full,user_xattr,acl,_netdev) Kernel 3.18.9, hardened Gentoo. debugfs.ocfs2 -R "stats" /dev/drbd0: Revision: 0.90 Mount Count: 0 Max Mount Count: 20 State: 0 Errors: 0 Check Interval: 0 Last Check: Sat Sep 19 14:02:48 2015 Creator OS: 0 Feature Compat: 3 backup-super strict-journal-super Feature Incompat: 14160 sparse extended-slotmap inline-data xattr indexed-dirs refcount discontig-bg Tunefs Incomplete: 0 Feature RO compat: 1 unwritten Root Blknum: 5 System Dir Blknum: 6 First Cluster Group Blknum: 3 Block Size Bits: 12 Cluster Size Bits: 12 Max Node Slots: 8 Extended Attributes Inline Size: 256 Label: vmh1cluster UUID: CF2BAA51E994478587983E08B160930E Hash: 436666593 (0x1a0700e1) DX Seeds: 3101242030 1341766635 3133423927 (0xb8d932ae 0x4ff9bbeb 0xbac44137) Cluster stack: classic o2cb Cluster flags: 0 Inode: 2 Mode: 00 Generation: 3336532616 (0xc6df7288) FS Generation: 3336532616 (0xc6df7288) CRC32: 00000000 ECC: 0000 Type: Unknown Attr: 0x0 Flags: Valid System Superblock Dynamic Features: (0x0) User: 0 (root) Group: 0 (root) Size: 0 Links: 0 Clusters: 1054130508 ctime: 0x54b593da 0x0 -- Tue Jan 13 13:53:30.0 2015 atime: 0x0 0x0 -- Wed Dec 31 16:00:00.0 1969 mtime: 0x54b593da 0x0 -- Tue Jan 13 13:53:30.0 2015 dtime: 0x0 -- Wed Dec 31 16:00:00 1969 Refcount Block: 0 Last Extblk: 0 Orphan Slot: 0 Sub Alloc Slot: Global Sub Alloc Bit: 6553 o2info --volinfo /dev/drbd0 : Label: vmh1cluster UUID: CF2BAA51E994478587983E08B160930E Block Size: 4096 Cluster Size: 4096 Node Slots: 8 Features: backup-super strict-journal-super sparse extended-slotmap Features: inline-data xattr indexed-dirs refcount discontig-bg unwritten _______________________________________________ Ocfs2-users mailing list Ocfs2-users@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-users
stat_sysdir.sh
Description: application/shellscript
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