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1. Verify filesystem is aligned to stripes (score: 1): Author: Spelic <spelic@xxxxxxxxxxxxx>; Date: Wed, 24 Nov 2010 19:39:56 +0100; Hi there, I thought there was a way to empirically check that the filesystem is correctly aligned to RAID stripes, but my attempts fail. I don't mean by looking at sunit and swidth from xfs_info, bec; /archives/xfs/2010-11/msg00380.html (7,843 bytes)
2. Re: Verify filesystem is aligned to stripes (score: 1): Author: Dave Chinner <david@xxxxxxxxxxxxx>; Date: Thu, 25 Nov 2010 16:46:07 +1100; IO may not be aligned, though allocation usually is. With a large stripe cache, the MD device waits long enough for sequential unaligned IO to fill a full stripe width and hence never needs to read t; /archives/xfs/2010-11/msg00388.html (9,455 bytes)
3. Re: Verify filesystem is aligned to stripes (score: 1): Author: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>; Date: Thu, 25 Nov 2010 01:00:37 -0600; Dave Chinner put forth on 11/24/2010 11:46 PM: Do you really mean RAID1 here Dave, or RAID10? If RAID1, please elaborate a bit. RAID1 traditionally has equal read performance to a single device, and; /archives/xfs/2010-11/msg00391.html (8,009 bytes)
4. Re: Verify filesystem is aligned to stripes (score: 1): Author: Dave Chinner <david@xxxxxxxxxxxxx>; Date: Thu, 25 Nov 2010 21:15:37 +1100; RAID10 is just a convenient way of saying "striped mirrors" or "mirrored stripes". Fundamentally they are still using RAID1 for redundancy - a mirror of two devices. A device could be a single drive; /archives/xfs/2010-11/msg00396.html (9,349 bytes)
5. Re: Verify filesystem is aligned to stripes (score: 1): Author: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>; Date: Thu, 25 Nov 2010 16:57:00 -0600; Dave Chinner put forth on 11/25/2010 4:15 AM: I've done no formal testing myself, but the last article I read that tested md RAID1 performance showed marginally faster read performance for a two disk; /archives/xfs/2010-11/msg00403.html (10,887 bytes)
6. Re: Verify filesystem is aligned to stripes (score: 1): Author: Richard Scobie <r.scobie@xxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 15:43:40 +1300; All my testing of md RAID1 has shown write performance of one device and single threaded read performance of one device. A second, concurrent read will be directed to the second device though. Regar; /archives/xfs/2010-11/msg00405.html (7,480 bytes)
7. Re: Verify filesystem is aligned to stripes (score: 1): Author: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 09:16:22 +0100; Le Thu, 25 Nov 2010 16:57:00 -0600 vous écriviez: It won't, it will simply end on one drive (actually one mirror). However because the mirrors are striped together, all drives in the array will be so; /archives/xfs/2010-11/msg00408.html (10,105 bytes)
8. Re: Verify filesystem is aligned to stripes (score: 1): Author: Dave Chinner <david@xxxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 23:22:18 +1100; No, that's wrong. I don't have the time to explain the intricacies of how XFS packs small files together, but it does. You can observe the result by unpacking a kernel tarball and looking at the layo; /archives/xfs/2010-11/msg00409.html (10,840 bytes)
9. Re: Verify filesystem is aligned to stripes (score: 1): Author: Spelic <spelic@xxxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 14:15:35 +0100; FWIW, for workloads that do random, small IO, XFS works best when you _turn off_ aligned allocation and just let it spray the IO at the disks. This works best if you are using RAID 0/1/10. All the nu; /archives/xfs/2010-11/msg00411.html (10,196 bytes)
10. Re: Verify filesystem is aligned to stripes (score: 1): Author: Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 15:05:41 +0100; That's interesting to read. Why would sunit/swidth be slower then? I'd thought that XFS then would know one stripe is 64k and I have 8 disks so it should try to pack 8*64=512kb in one junk on disk, a; /archives/xfs/2010-11/msg00412.html (10,841 bytes)
11. Re: Verify filesystem is aligned to stripes (score: 1): Author: Emmanuel Florac <eflorac@xxxxxxxxxxxxxx>; Date: Fri, 26 Nov 2010 15:36:14 +0100; Le Fri, 26 Nov 2010 23:22:18 +1100 Dave Chinner <david@xxxxxxxxxxxxx> écrivait: What I had in mind (typical random IO) is DB access, which is AFAIK synchronous IO, my bad :) -- -- Emmanuel Florac | D; /archives/xfs/2010-11/msg00414.html (9,793 bytes)

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